I am trying to figure out how to display an image while PHP runs and disappears after.
I grabbed this code from a site, but the image only shows very briefly at the very end of the PHP loading. It doesn't show when the page initially opens and it only seems to run once.
I have read many and many of websites and threads on here, but I can't figure out what is missing in this simple example. Is there a better way to do this? Or is this it and I just need to fix it?
THANK YOU in advance!
<html>
<head>
<title>Home</title>
<style>
/* This only works with JavaScript,
if it's not present, don't show loader */
.no-js #loader { display: none; }
.js #loader { display: block; position: absolute; left: 100px; top: 0; }
.se-pre-con {
position: fixed;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
z-index: 9999;
background: url(http://smallenvelop.com/wp-content/uploads/2014/08/Preloader_51.gif) center no-repeat #fff;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.2/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.2/modernizr.js"></script>
<script>
// Wait for window load
$(window).load(function() {
// Animate loader off screen
$(".se-pre-con").fadeOut("slow");;
});
</script>
</head>
<body>
<div id="loader" class="se-pre-con"></div>
<?php
include 'content/screen.php';
?>
</body>
</html>
SOLVED! I found and modified this AJAX code that worked for exactly what I was looking for (same page load with multiple options on what to load (by links). Thanks for all of the helpful messages directing me on the right path! This community is awesome!
<head>
<title>Demo</title>
<style>
#fade {
display: none;
position:absolute;
top: 0%;
left: 0%;
width: 100%;
height: 100%;
background-color: #ababab;
z-index: 1001;
-moz-opacity: 0.8;
opacity: .70;
filter: alpha(opacity=80);
}
#modal {
display: none;
position: absolute;
top: 45%;
left: 45%;
width: 64px;
height: 64px;
padding:30px 15px 0px;
border: 3px solid #ababab;
box-shadow:1px 1px 10px #ababab;
border-radius:20px;
background-color: white;
z-index: 1002;
text-align:center;
overflow: auto;
}
</style>
<script>
function openModal() {
document.getElementById('modal').style.display = 'block';
document.getElementById('fade').style.display = 'block';
}
function closeModal() {
document.getElementById('modal').style.display = 'none';
document.getElementById('fade').style.display = 'none';
}
function loadAjax(page) {
document.getElementById('results').innerHTML = '';
openModal();
var xhr = false;
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
}
else {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
if (xhr) {
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
closeModal();
document.getElementById("results").innerHTML = xhr.responseText;
}
}
xhr.open("GET", "content/"+page+".php", true);
xhr.send(null);
}
}
</script>
</head>
<body>
<div id="content">
Click to load page 1<br/><br/>
Click to load page 2<br/><br/>
<div id="results"><!-- Results are displayed here --></div>
<div id="fade"></div>
<div id="modal">
<img id="loader" src="loading.gif" />
</div>
</div>
</body>
</html>
It has all to do with the output buffering PHP applies.
This Stack Overflow link explains why it doesn't work as expected, a possible way to make it work and why you shouldn't make it work that way.
PHP always (unless specifically told not to) buffers the output before printing it. That means that when you actually print, PHP just stores the output text in the memory. After everything is printed, the contents stored in the memory gets printed and the memory gets flushed. It is not only PHP that does that. Almost all the I/O libraries across many languages and platforms has this feature, which is generally enabled by default.
Here is a relevant link that shows all the possible options to bypass or disable this feature. I personally think that you shouldn't disable it because the image will still need to be loaded and you won't be able to control the latency between PHP loading and image loading. I think in this situation maybe a solution that involved Ajax is more suitable for your needs.
Are you trying to show a loading animation/image for the PHP operation? If yes, then you should definitely do it with Ajax on a separate action.
Edit: sorry about not pasting the link: How to disable output buffering in PHP
Here's how to apply Show image while page is loading to your situation.
Replace your php tag with a div like this:
<div id="main"></div>
Then change your fadeout script like this:
<script>
$(document).ready(function() {
$("#main").load("content/screen.php", function () {
// Animate loader off screen
$(".se-pre-con").fadeOut("slow");
});
});
</script>
Related
I need to display most of a page's content before outputting the content from a function. The function takes a while to execute, and returns some content for the page. I need the rest of the page to display first, then run the function, and then 'insert' the function output.
It would seem that I'd need to use ob_start at the beginning of the function, then store that data in a variable with ob_get_content(). But I'd also need to run the function after the rest of the page displays.
Here's some code I have tried without success (this is the content area inside the body tag):
<div id='part1'>
<p>here is part 1 of the content</p>
</div>
<div id='part2'> // this is where the function output will be inserted after processing it
<p>part 2</p>
<?php echo long_function();?>
</div>
<div id='part3'>
<p>this is part 3 of the content
</div>
<?php
function long_function() {
// some process that takes a long time to get data
// and stores it in the $part2_content
return $part2_content;
}
The result should be that the part1 and part3 div content should be displayed. And then, when the long_function() finishes with gathering up it's data, that data should be output in the 'part2' section.
I've tried to put an ob_start() at the beginning of long_function(), then $part2_content = ob_get_contents() to store that output data (without an ob_flush).
I think that I may need to add some sort of DOM 'write' to the 'part2' ID, but not sure of the right combination to accomplish.
I believe you can't do the server side rendering.
php is back-end language, that run the hole script file, then last thin print the output
for example:
in a function:
you cant return then call code after
function sayHi(){
$word = 'hi';
return "bye";
echo $word; // this code will never work :)
}
sloution ?
so you need to use Clint side rendering
for example use ajax
AJAX stands for Asynchronous JavaScript and XML. AJAX is a new technique for creating better, faster, and more interactive web applications with the help of XML, HTML, CSS, and Java Script.
Based on this answer which is completely acceptable:
https://stackoverflow.com/a/46871956/17292588
PHP is a server-side programming language. It gets executed when you
request a page. So you cannot execute it after the page has been
loaded. If you need to check if something has loaded on the client
side, you'll have to use a client-side programming language like
JavaScript.
I suggest you to putting this long_function in a another route and request it with Ajax during (or after) loading page.
Based on the answers provided and links (as well as remembering the PHP is server-side so can't change things after the page is rendered), I came up with this code which worked for my purposes. Change the <some-page-on-your-site> to the page you want to get as needed.
I included a CSS-only spinner so you can watch something while the Ajax request is working.
<!DOCTYPE html>
<html>
<head>
<style>
/* for the loading spinner */
#spinner {
display:none;
position: fixed;
margin: auto;
width: 30%;
background-color: white;
top:40%;
left:30%;
border:thin solid darkblue;
}
.spinner {
border: 8px solid gray;
border-radius: 50%;
border-top: 8px solid green;
border-right: 8px solid lightgreen;
border-bottom: 8px solid green;
border-left: 8px solid lightgreen;
width: 30px;
height: 30px;
-webkit-animation: spin 2s linear infinite;
animation: spin 2s linear infinite;
}
.spinner_book {
transform: rotate(360deg);
-webkit-transform: rotate(360deg);
overflow: hidden;
transition-duration: 0.8s;
transition-property: transform;
}
#-webkit-keyframes spin {
0% { -webkit-transform: rotate(0deg); }
100% { -webkit-transform: rotate(360deg); }
}
#keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
</style>
</head>
<body onload='loadDoc()'>
<div>
<div id='ajax_results'>
<div align='center'>
<p align='center' class='spinner'></p>
<p align='center'>Please wait we get the data ...</p>
</div>
</div>
</div>
<script>
function loadDoc() {
const xhttp = new XMLHttpRequest();
xhttp.onload = function() {
document.getElementById("ajax_results").innerHTML = this.responseText;
}
xhttp.open("GET", "<some-page-on-your-site>");
xhttp.send();
}
</script>
</body>
</html>
You can add query parameters to the <some-page-on-your-site> .
Note that the initial text in the 'ajax_results' div (the spinner and message) will be replaced by the contents of the request. So nothing needed to remove the spinner after the request is completed.
Thanks for the answers which helped me get to my solution. I hope this helps others who wander here.
i want to display the following Post in 3 different sections. The first section is the table of content. The second is the summary and the third is the theory. Is like a multipage post but each page has a section, as I don't want to show all the information in a single page.
Thanks in advance
The way I have come up with this is this way.
I'm only posting these because I have it all setup so I can basically copy and paste it in. Next time I want to see more effort on your part.
Create a new JS file. well call it mytabs.js in that file put this:
;( function( $, window, document, undefined ) {
"use strict";
$( document ).ready( function() {
var loadTabOrder = function(id){
// Define friendly data store name
var dataStore = window.sessionStorage;
var oldIndex = 0;
// Start magic!
try {
// getter: Fetch previous value
oldIndex = dataStore.getItem(id);
} catch(e) {}
return oldIndex;
};
var saveTabOrder = function(id, currentIndex){
// Define friendly data store name
var dataStore = window.sessionStorage;
// Start magic!
try {
dataStore.setItem( id, currentIndex );
} catch(e) {}
};
$('.ui-tabs-vertical').each(function(){
var id = $(this).prop('id');
if(!id) $.error('.ui-tabs-vertical requires an id');
var element = $( "#"+id );
var options = {
active: loadTabOrder(id),
activate: function(event, ui) {
saveTabOrder(id, ui.newTab.parent().children().index(ui.newTab));
}
};
element.tabs(options).addClass( "ui-helper-clearfix" );
var nav = element.find('> .ui-tabs-nav > li');
nav.removeClass( "ui-corner-top" ).addClass( "ui-corner-left" );
var height = 0;
nav.each(function(){
height += $(this).outerHeight();
});
element.find('> .ui-tabs-panel').css(
'min-height',
height+'px'
);
});
} );
} ) ( jQuery, window, document );
Somewhere in your theme/pllugin put this:
//ui css
wp_enqueue_style('jquery-ui');
//jquery
wp_enqueue_script('jquery');
//jquery-ui
wp_enqueue_script('jquery-ui');
//you only need to do the above it you dont have them included already
//add our JS page.
wp_enqueue_script('mytabs', plugin_dir_url(__FILE__).'mytabs.php', ['juery-ui']);
//in my case this is in a plugin file, obviously use your path to your JS file
In your CSS file add these, make sure your CSS loads after jQuery UI
.ui-tabs.ui-tabs-vertical {
padding: 0;
height: 100%;
width: calc(100% - 15px);
position: relative;
}
.ui-tabs.ui-tabs-vertical .ui-widget-header {
border: none;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav {
float: left;
width: 10em;
background: #EEE;
border-radius: 4px 0 0 4px;
border-right: 1px solid gray;
position: absolute;
top : 0;
bottom: 0;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li {
clear: left;
width: 100%;
margin: 0.2em 0;
border: 1px solid gray;
border-width: 1px 0 1px 1px;
border-radius: 4px 0 0 4px;
overflow: hidden;
position: relative;
right: -2px;
z-index: 2;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li a {
display: block;
width: 100%;
padding: 0.6em 1em;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li a:hover {
cursor: pointer;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li.ui-tabs-active {
margin-bottom: 0.2em;
padding-bottom: 0;
border-right: 1px solid white;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li:last-child {
margin-bottom: 10px;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-panel {
float: left;
margin-left: 150px;
width: calc(100% - 200px);
min-width: 600px;
border-radius: 0;
position: relative;
left: -1px;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-panel .panel-title{
padding: 0px;
margin: 0px;
margin-bottom: 10px;
font-size: 22px;
}
In your HTML add something like this
<div id="myttabs" class="ui-tabs-vertical">
<ul>
<li>General</li>
<li>Foo</li>
</ul>
<div id="settings-panel">
<p>Here is some settings</p>
</div>
<div id="foo-panel">
<p>Here is some foo</p>
</div>
</div>
Overview
How it works. In the above HTML you will notice ui-tabs-vertical class. Then in our mytabs.js we do this:
$('.ui-tabs-vertical').each(function(){ ... }
In short what this does is any element that has the ui-tabs-vertical class will get the ui-tabs added automagially. This is especially nice for wordpress as we can get into a real mess trying to put JS in a post (for example). So we want it as clean an free as possible. This trick with some variation can be used on any of the UI elements that create similar stuff, same type of popup, or anything we can normalize to a common format, so we don't have too many arguments.
Pass options -via- data attributes
One way to pass options to the JS, that I didn't need here is to simply put them in a data- attribute on the main element or any element that makes sense. For example you can set .tabs({hide:true}) to hide the tabs.
So if I wanted to do that I would do something like this:
//in our HTML add the data attribute to the main element
<div id="myttabs" class="ui-tabs-vertical" data-hide="true" >
//in myscript.js - change the options object.
var element = $( "#"+id )
var options = {
hide: element.data('hide') | false,
active: loadTabOrder(id),
activate: function(event, ui) {
window.saveTabOrder(id, ui.newTab.parent().children().index(ui.newTab));
}
};
The active tag will be remembered by the users browser by making use of some simple Session Storage stuff in there. These are keyed off the ID of the main HTML element for the tabs. This makes that ID required, so there is a bit of code to issue an error to the console, for development purposes. Its important to use the tabs ID, because that way each tab will have it's own settings remembered. If we mixed them we would probably get some errors for missing tab indexes etc..
There are also some modifications to the vertical CSS to expand the area behind the Tabs. I probably spent the most time on this piece and its a relatively minor visual issue. But I cant have that in my work. This is actually quite tricky to do, as you will see below. It looks way better with the full width background.
You can see this issue even on the jQuery example page.
The way I fixed it was
position:absolute on the navigation box with a top:0 and bottom:0, the parent element should be position:relative. This alone basally solves the 100% height issue, now we have to deal with the side effects of absolute positioning.
A few tricks like this width: calc(100% - 200px); to dynamically get the width set up. Absolute elements are not part of the Box Model of the DOM, so it's very hard to account for them with just CSS as they don't hold any space in the container.
Now all we need to do is set the min-height. The only reason we need to do this is everything goes janky if you have a lot of menu item (absolute) but no content in the tab (height is smaller then the nav). Which will bust it out of the bottom of the ui-tabs container because its absolute positioned. This is because with the top:0 and bottom:0 we are tying the width of the navigation menu to the main ui-tabs container. When the panel is empty that container will be shorter then the menu, which is a problem with many menu items and tiny panels. It can also cause some issues if you load content -via- AJAX, as you may see this error for second while the request goes.
4 So with the last bit of JS we just need to set min-height to apx the same height as the navigation's height. Because the navigation is absolute and tied to the parent container (as I said above, its height is dependent on .ui-tabs), so we can't simply get the height of that. The only option I saw was to sum the height of it's contents, the li elements themselves. This is a bit harder but we only need to do it one time for each ui-tabs.
The absolute position stuff will dynamically adjust the height (with just CSS) if the tab height changes, such as loading content via AJAX or other dynamic stuff.
The .ui-tabs-panel are set to float:left with a margin apx the width of the tab navigation. This accounts for the horizontal space the navigation takes up. Then to get something resembling a proper 100% width, we can use width: calc(100% - 200px); again because the nav is absolute we are sort of stuck manually offsetting for it. So This has 150px for the menus width offset, (or the left-margin on the panel, about the same width as the nav) and an extra 50 for things like the margin on the right and some other padding etc. We could have used negative margins for some of these (but I didn't think about that tell now)
Now having the panel width dynamic and like a real 100% width, all we need to do to make the panel smaller is adjust the width of the container around the main UI-Tabs element. This way we can adjust it without sending any arguments to .tabs() or changing any thing with JS.
As I said that menu thing is a hard problem to solve, this is mainly due to the fact were limited in what we can do structure wise, or we will just break the ui-tabs. So we cant really change that, and that leave only JS and CSS. CSS is preferable because then we don't have to write yet more JS, and we would need to keep watch on the contents changing to resize it. Even then there would be some lag in the change. For example using an setInterval to keep an eye on it, this is something we want to avoid as it can affect performance too, and is more of a headache then the minor visual problem that this is.
Summery
I basically just pasted this from my own plugin, so I can't grantee that I covered everything. I cant stand little quirky things like the images above so I always fix that stuff. And I try to make my life easier later so now we just make the HTML and add the ui-tabs-vertical and mytabs.js takes care of the rest. Lastly we should never have to mess with mytabs.js and anytime we want a tab setup we just add the HTML with that class.
There is probably a tiny performance penalty to this (maybe) but in Wordpress it can be really hard to call JS from posts or other content in a "clean" way. So this just encapsulates all that code and make it a lot cleaner and easier to maintain IMO because, you are not mixing HTML and JS and CSS etc.
Hope it helps:
PS if the way I start my JS looks funny please see this question:
What advantages does using (function(window, document, undefined) { ... })(window, document) confer?
And this one:
How does this JavaScript/JQuery Syntax work: (function( window, undefined ) { })(window)?
Basically its a self executing function that keeps our global JS space clean, so we don't get any conflicts from other plugins, or scripts that may use the same variable names as we are.
I do a fair amount of plugin development, so its a bit more common to use it for that, but I just basically copy and paste it now, so... Also I feel I should mention this is part of a much larger script that dynamically adds a bunch of UI stuff for me. That way when I'm working on HTML, I can just work on HTML etc...
For the final result check this out:
;( function( $, window, document, undefined ) {
"use strict";
$( document ).ready( function() {
var loadTabOrder = function(id){
/*// Define friendly data store name
var dataStore = window.sessionStorage;
var oldIndex = 0;
// Start magic!
try {
// getter: Fetch previous value
oldIndex = dataStore.getItem(id);
} catch(e) {}
return oldIndex;*/
};
var saveTabOrder = function(id, currentIndex){
/*// Define friendly data store name
var dataStore = window.sessionStorage;
// Start magic!
try {
dataStore.setItem( id, currentIndex );
} catch(e) {}*/
};
$('.ui-tabs-vertical').each(function(){
var id = $(this).prop('id');
if(!id) $.error('.ui-tabs-vertical requires an id');
var element = $( "#"+id );
var options = {
active: loadTabOrder(id),
activate: function(event, ui) {
saveTabOrder(id, ui.newTab.parent().children().index(ui.newTab));
}
};
element.tabs(options).addClass( "ui-helper-clearfix" );
var nav = element.find('> .ui-tabs-nav > li');
nav.removeClass( "ui-corner-top" ).addClass( "ui-corner-left" );
var height = 0;
nav.each(function(){
height += $(this).outerHeight();
});
element.find('> .ui-tabs-panel').css(
'min-height',
height+'px'
);
});
$('#expand').click(function(){
$('#'+$( "#mytabs li.ui-tabs-active" ).attr('aria-controls')+' p').css({"height":'300px'});
});
$('#shrink').click(function(){
$('#'+$( "#mytabs li.ui-tabs-active" ).attr('aria-controls')+' p').css({"height":''});
});
} );
} ) ( jQuery, window, document );
.ui-tabs.ui-tabs-vertical {
padding: 0;
height: 100%;
width: calc(100% - 15px);
position: relative;
}
.ui-tabs.ui-tabs-vertical .ui-widget-header {
border: none;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav {
float: left;
width: 10em;
background: #EEE;
border-radius: 4px 0 0 4px;
border-right: 1px solid gray;
position: absolute;
top : 0;
bottom: 0;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li {
clear: left;
width: 100%;
margin: 0.2em 0;
border: 1px solid gray;
border-width: 1px 0 1px 1px;
border-radius: 4px 0 0 4px;
overflow: hidden;
position: relative;
right: -2px;
z-index: 2;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li a {
display: block;
width: 100%;
padding: 0.6em 1em;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li a:hover {
cursor: pointer;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li.ui-tabs-active {
margin-bottom: 0.2em;
padding-bottom: 0;
border-right: 1px solid white;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-nav li:last-child {
margin-bottom: 10px;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-panel {
float: left;
margin-left: 150px;
width: calc(100% - 200px);
min-width: 600px;
border-radius: 0;
position: relative;
left: -1px;
}
.ui-tabs.ui-tabs-vertical .ui-tabs-panel .panel-title{
padding: 0px;
margin: 0px;
margin-bottom: 10px;
font-size: 22px;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.js"></script>
<div id="mytabs" class="ui-tabs-vertical">
<ul>
<li>General</li>
<li>Foo</li>
</ul>
<div id="settings-panel">
<p>Here is some settings</p>
</div>
<div id="foo-panel">
<p>Here is some foo</p>
</div>
</div>
<div style="margin-top: 20px">
<button id="expand" >Click here to expand the panel</button>
<button id="shrink" >Click here to shrink the panel</button>
</div>
The only notes here, is I added the buttons to showcase how the gray nav background resizes automatically and Stack Overflow wont let me use the sessionStorge here. So I had no choice but to comment it out.
Sense there is so much code, most of it is pretty simple stuff really, I didn't want it all in the snip-it windows, as its a bit harder to read there. So forgive the lengthy post, but I wanted it to all make sense.
Enjoy!
i have a code here which is intended to show a Javascript modal when a textbox is not filled (when send button is clicked it will check for unfilled textboxes and checkbox AND SHOW THE MODAL, if everything is fine, it will send an email...Im working on the textbox first). But I have some problem displaying the modal properly. It seems like when i use display: block it will be shown along with other objects in the form. but when i set it to display: none, nothing is being displayed even after the send button is clicked.
Here's the CSS for modal:
#overlay {
display: block;
position: absolute;
left: 0px;
top: 0px;
width:100%;
height:100%;
text-align:center;
z-index: 800;
}
#overlay div {
width:800px;
margin: 100px auto;
background-color: none;
border:none;
padding:15px;
text-align:center;
}
body {
height:100%;
width:100%;
margin:0;
padding:0;
overflow:auto;
}
HTML:
<div id="overlay">
<div>
<img src="images/NoUsername.png" alt="module" style="width:469px; height:345px;">
<p>[<a href='#' onclick='overlay()'>close</a>]</p>
</div>
I got these codes from http://raventools.com/blog/create-a-modal-dialog-using-css-and-javascript/
Here is the PHP code for checking the textbox:
if ($username == "") {
echo
"<script type=\"text/javascript\">
function overlay() {
el = document.getElementById(\"overlay\");
el.style.visibility = (el.style.visibility == \"visible\") ? \"hidden\" : \"visible\";
}</script>";
}
I tried using double and single quotations here but nothing happens. I think the problem is in my CSS. Please feel free to edit my code. Thanks in advance for your help guys!
As I commented, you should study a little more CSS and HTML before going straight through programming like PHP and JavaScript. Your question will probably be flagged as low quality before you can really learn something meaningful from it.
I think the visibility attribute isn't suitable for your needs, as it allocates space in the DOM for the element even though it's hidden. I also think you should choose between showing the modal by PHP (server-side) or by JavaScript (client-side) as what you're doing now is becoming very confuse, even more for a novice.
I would modify your CSS to:
#overlay {
display: none; /* hidden if not overwritten by style="" attribute or javascript */
position: fixed; /* fixed makes more sense here as it doesn't depend on the element's parents, search for it */
...
IF you choose to show or hide the modal by php, it would be something like
<div id="overlay" <?php if ($username == "") echo 'style="display: block;"' ?>>
<div>
<img src="images/NoUsername.png" alt="module" style="width:469px; height:345px;">
...
OR, in my opinion the best approach, making it entirely in JavaScript (client-side), without relying on php:
<script type="text/javascript">
function show_modal() {
el = document.getElementById("overlay");
el.style.display="block";
}
function hide_modal() { // You'll want to use this for the close button
el = document.getElementById("overlay");
el.style.display="none";
}
function verify_elements() {
el = document.getElementById("username");
if (el.value == '') {
show_modal(); // if the username is '', show'em the modal
return false; // returning false makes sure the form isn't submited
}
}
</script>
<form action="" method="post" onsubmit="verify_elements()">
<input name="username" id="username" value="" />
...
I hope it helps to put you in right path. But you should really go step-by-step into this if you really want to learn instead of copy-and-paste forever :D
Best Regards!
I think that you missed to call the function added to the page:
if ($username == "") {
echo
"<script type=\"text/javascript\">
function overlay() {
el = document.getElementById(\"overlay\");
el.style.visibility = (el.style.visibility == \"visible\") ? \"hidden\" : \"visible\";
}
overlay();
</script>";
}
Also, I believe that the overlay should be hidden by default:
#overlay {
display: block;
position: absolute;
left: 0px;
top: 0px;
width:100%;
height:100%;
text-align:center;
z-index: 800;
visiblity: hidden;
}
Sorry if this question has been asked a lot. I am currently working on a site that will have a custom gallery. Of all things to get stuck on right now, its the gallery page indicator.
On this page, the left portion will be made of a gallery of "galleries", displaying 6 galleries per "page". http://www.ct-social.com/ctsdev/aff/news-and-events/
Above the gallery are small blue dots that will serve as gallery indicators. The code to create the gallery indicators is as follows:
<?php for ($i=0; $i < $n2; $i++): ?>
<div class="event-gallery-unselected"></div>
<?php endfor; ?>
Upon loading I would like the left most dot to be given a different style that is attributed to class="event-gallery-selected". Upon clicking any other dot (except the current selection) the currently selected dot needs to revert back to "event-gallery-unselected" and the clicked dot takes on "event-gallery-selected"
I am kinda new to PHP, very new to JavaScript and JQuery. If using either of those languages as an example could you please breakdown your explanation? Thank you very much for all of your help.
Updated code:
CSS
.event-gallery.selected {
position: relative;
top: -0.7em;
background: white;
background-color: #1e93bb;
width: 20px;
height: 20px;
margin: 7px;
border-radius: 50%;
}
.event-gallery {
position: relative;
top: -1.1em;
background: white;
background-color: #63c5e7;
width: 15px;
height: 15px;
border-radius: 50%;
margin: 7px;
float: right;
cursor: pointer;
}
Updated Code JS
<script type="text/javascript">
jQuery(document).ready(function($){
$(".event-gallery").click(function() {
$(this).addClass('selected').siblings().removeClass('selected');
});
});
</script>
Just got it working now.
I would suggest having a class which is present on all of your gallery div elements. This will allow the common styles to be maintained and also allow you to have only 1 click handler. You can then have a separate selected class which you toggle as needed. Try this:
<?php for ($i = 0; $i < $n2; $i++): ?>
<div class="event-gallery"></div>
<?php endfor; ?>
.event-gallery {
color: #000; /* default styling ... */
padding: 5px;
}
.event-gallery.selected {
color: #FFF; /* selected item styling ... */
background-color: #C00;
}
$(".event-gallery").click(function() {
$(this).addClass('selected').siblings().removeClass('selected');
});
Example fiddle
use jQuery like this:
$('divid').click(function(){
$('divid').css('background-image', 'pic2.jpeg');
});
for example
If you have a set of elements:
<div class="wrapper">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>
I typically handle it as such:
var $items = $('#wrapper .item');
$('.item').click(function(){
$items.removeClass('active'); // 'reset' the active links
$(this).addClass('active'); // apply the active class to the clicked item
})
This can easily be done with a little bit of help from jQuery.
$(function() {
$(".even-gallery-unselected").on("click", function() {
this.removeClass("event-gallery-unselected")
.addClass("event-gallery-selected");
});
});
I have a "news" div and a "banner" div.
I want user to see the "banner" div when page loads. This "banner" div should show over the "news" div, exactly over the position, covering the "news" div. So:
How should I do to detect position of "news" div and show the "banner" div over, floating, without affecting the grid structure?
Any jQuery plugin that allows user to hide that div and never show again? w/ cookie?
Hope you've understood my idea. I leave an image:
use the jquery's offset
http://api.jquery.com/offset/
and the jquery's show and hide
http://api.jquery.com/show/
you can use hte negative margin for the banner to come over to the news...div.
Let me know if you need anything...
use absolute postioning for news banner.
I've written a script for you which should help.
It uses the Cookie plugin for jQuery.
I've put some comments in the code so hopefully it should be pretty self-explanatory.
Feel free to come back with other questions you may have.
Usage
You should see a banner on first load, then click run again and it should dissapear.
The banner will be positioned exactly above the news-list using absolute positioning, the width/height and the top/left offset of the newslist.
I realise this question has already been answered, but I thought I'd offer a slight alternative, using CSS, jQuery and the jQuery cookie plugin:
html:
<div class="container">
<div class="news">
<p>Lorem ipsum dolor sit amet...</p>
</div>
<div class="banner">
<p>Yet more text, this time it's the banner.</p>
<span class="close">X</span>
</div>
</div>
<div id="clear">Remove the cookie</div>
css:
.container {
width: 80%;
min-height: 400px;
position: relative;
border: 4px solid #000;
}
.news {
width: 100%;
height: 100%;
}
.banner {
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: #f00;
}
.close {
position: absolute;
top: 0;
right: 0;
border-left: 2px solid #fff;
border-bottom: 2px solid #fff;
width: 2em;
line-height: 2em;
text-align: center;
display: block;
cursor: pointer;
}
#clear {
width: 80%;
text-align: right;
color: #fff;
background-color: #999;
border: 4px solid #000;
border-top-width: 0;
font-family: arial, sans-serif;
cursor: pointer;
}
jQuery:
$(document).ready(
function(){
if ($.cookie('closed')){
$('.banner').remove();
}
$('.close').click(
function(){
$(this).closest('.banner').remove();
$.cookie('closed',true, {expires: 30});
});
$('#clear').click(
function(){
$.cookie('closed',false, {expires: -200});
});
});
JS Fiddle demo.
A slightly more pleasing demo, with animate():
$(document).ready(
function(){
if ($.cookie('closed')){
$('.banner').remove();
}
$('.close').click(
function(){
$(this)
.closest('.banner')
.animate(
{
'top':'120%'
}, 1500,
function(){
$(this).remove();
}
);
$.cookie('closed',true, {expires: 30});
});
$('#clear').click(
function(){
$.cookie('closed',false, {expires: -200});
});
});
Demo at JS Fiddle
Edited with an afterthought, assuming that you get repeat visitors, it might be worth re-setting the cookie in the initial if check, to ensure that they don't see the banner ever again (unless they leave more than 30 days between visits), changing it to:
if ($.cookie('closed')){
$('.banner').remove();
$.cookie('closed',true,{expires: 30});
}