I am wondering whether this is possible:
I have a page. The user clicks a link and that calls a PHP script. The PHP script returns true or false.
Depending on the true or false, I was hoping to be able to toggle a div.
I am wondering whether I need to do it the AJAX way? How do people usually accomplish this?
Seems pretty common.
I am using this YUI library already:
<link rel="stylesheet" type="text/css" href="http://yui.yahooapis.com/combo?2.8.2r1/build/reset-fonts-grids/reset-fonts-grids.css&2.8.2r1/build/base/base-min.css">
jQuery:
$.post('/path/to/url', {data: 'some data'}, function(data) {
if (data) $('#some-div').show();
else $('#some-div').hide();
}, 'json');
PHP:
echo json_encode(true);
For more information see:
http://api.jquery.com/category/ajax/
http://php.net/manual/en/function.json-encode.php
Yes, you should use AJAX to create a good flow in your site. Instead of implementing your own AJAX handling functions, you could use one of the big JavaScript frameworks, I recommend http://jquery.com/. There, you can read about (and see examples of) jQuery.ajax - http://api.jquery.com/category/ajax/.
This should get you started, but the main idea is to bind that link to an AJAX function, that will call your PHP script, and based on the contents of the returned data, toggle your DIVs on/off.
Good luck!
Set the php script to add a hidden field ... such as...
<input type="hidden" id="passed-value" value="passed-val-is-true" />
Then in your Javascript when you fire the toggle event .. check that element ...
In jQuery would be something like this ...
$foo.click(( if (passed-value.value === "passed-val-is-true") { foo.toggle(); }
Sorry for syntax .. but you should get the general idea.
Also, if you need it to do without page reload, i would def recommend Ajax (pref via jQuery)
Yes, very easy, no need for Ajax. Here's two ways:
Using straight PHP:
<?php
if($test) {
echo "<div>Content...</div>";
}
?>
Or, using inline Javascript (in the PHP script), assuming you have a <div id='targetDiv'> in your HTML, and a $testVar in your PHP:
<script type='text/javascript'>
function toggle(testVar) {
if(testVar) { document.getElementById('targetDiv').style.display = ""; }
else { document.getElementById('targetDiv').style.display = "none"; }
}
window.onload = function() { toggle(<?php echo $testVar; ?>); }
</script>
The second method can be easily altered to degrade gracefully.
Related
index.php
<?php
$loginmessage = "this is message";
?>
$(document).ready(function(){
$("#sb-btn").click(function() {
alert("<?=$loginmessage?>");
return false;
});
});
i have a button i wanted to when the button is clicked , it alert the $loginmessage by java script , but when i clicked it noting happen and no error as well. what i have to do to make the php variable pass to javascript and alert it when user clicked.
Don't forget to call jquery library. then try this-
<?php
$loginmessage = "this is message";
?>
<script>
$(document).ready(function(){
$("#sb-btn").on("click", function() {
var getvalue = '<?php echo $loginmessage; ?>';
alert(getvalue);
});
});
</script>
Depending upon your PHP version and host, the short tags could be disabled. They recently came back into use with PHP7, which is still in Release Candidate state.
What this means is that you might have to replace the short tags with the full <?php echo use. Look in the generated HTML code on the client, to find out if this is the case.
One small thing I'd like to nitpick on, is your terminology. :P
You're not actually passing a variable to JavaScript from PHP, as much as you're using PHP to generate parts of said JS. It might seem trivial, but the difference is a crucial one. Passing the variable implies something being handled in the same program, which isn't the case at all here. The PHP code gets executed on the server side, which generates plain text output to the client. The client (web browsers) in turn parses said content, and figures out what kind of content the different part of this text actually is.
Having this clear mental separation in mind when developing web applications/sites will make it a lot easier for you to understand the details of how things work, and in turn make it easier for you to come up with clean and simple solutions that works as intended. :)
Try to write in console. Maybe your browser blocks alert messages. And-> are you see JavaScript errors in your console?
<script>
$(document).ready(function(){
$("#sb-btn").on("click", function() {
var getvalue = '<?php echo $loginmessage; ?>';
console.log(getvalue);
});
});
</script>
Create a function that is called when a button is clicked. Pass the message that you want to alert to that function. Hope this helps. Checkout the code in snippet.
function alertSomething(test){
alert(test);
}
<button name="samplebtn" onclick="alertSomething('test alert')">Test Alert</button>
I am trying to use some jQuery functions inside of my php page which I am using for a wordpress plugin. I have imported the jquery api using the below code however I'm not sure how to write the function.
<?php
echo "Custom Book Settings Page";
echo '<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>';
this produces syntax error
<?php
$("#form1").submit(function() { $.post("customBook-index.php"); return false; alert ("submit form 1"); });
?>
Like the others have said, you can't use JavaScipt (or any of its libraries) inside PHP. You certainly can, however, use PHP to print out JavaScript which will be run at the appropriate time.
<?php echo "<script type='text/javascript'>
$(document).ready(function(){
$('#form1').submit(function() {
$.post('customBook-index.php');
return false;
alert ('submit form 1');
});
});
</script>";
?>
why wouldnt you just have the syntax without the tags?
$("#form1").submit(function() { $.post("customBook-index.php"); return false; alert ("submit form 1"); });
if you have to have php write the statement, you forgot the echo
<?php
echo '$("#form1").submit(function() { $.post("customBook-index.php"); return false; alert ("submit form 1"); });';
?>
You cannot use jQuery like that within your PHP. JQuery is a JavaScript library. It is essentially code that is pre-written for you and abstracted in such a way that it makes it easy to use. When you call $('#myElementId) you are calling an abstraction of a JavaScript function (or set of functions).
Using jQuery within PHP won't work, because the PHP interpreter has no way to make sense of it. It would be like speaking giving instructions in Chinese to a (monoglot) Anglophone. Furthermore, there is a significant difference between PHP and JavaScript in as much as PHP is executed on a web server, and JavaScript is executed on a client's machine. This is an important concept to understand for any web programmer.
In short, you either need to write your JS function into a <script> tag on the page such that the navigator parses it as JavaScript, or determine the PHP equivalent for what you are trying to do.
// turn off php
?>
$("#form1").submit(function() {
$.post("customBook-index.php");
return false;
alert ("submit form 1");
});
<?php
On my page I have a search result that contains a list with users where each is followed by an "addfriend" button. Each row contains a username and userID. Meanwhile the ID of the user that requested the searchresult is stored in a Session variable.
When the addfriend-botton is clicked the following 2 things should happen:
Store the userID and $_SESSION['userID'] is a MySQL table which describes the relationship.
Do NOT refresh the page (this the core of my problem) but stay focussed and change the state of the button to e.g. "friend request send". I'm thinking of GetElementByID().style method.
I was thinking of this:
<a href="#" onClick="addFriend('<? echo $_SESSION['userID'];?>','<? echo $rij['userID']; ?>')">
which calls the javascript function addfriend
I was hoping to catch the two ID's like this:
<script>
function addfriend(id1, id2)
{
//server side php code where I use value of
//the client-side javascript variables: +id1+ and +id2+ .
}
</script>
Is this at all possible or I'm I thinking the wrong way? Any suggetions on how to accomplish this?
You are in the right way, inside your addFriend() function, you can call one php file (via AJAX) and send the IDS without refresh the page. I think better you work with Jquery in this case, something like this:
<script>
function addfriend(id1, id2)
{
$.ajax({
type: 'POST',
url: 'yourPHPfile.php',
data: { your_id_1:id1, your_id_2:id2 },
success: function(data){
if(data){
alert('Done!');
}
},
dataType: 'text'
});
}
</script>
And in your PHP File you can do this:
<?php
//receive Ids
$id1 = $_POST['your_id_1'];
$id2 = $_POST['your_id_2'];
//do something here
echo "OK!";
<?
to do this work you need download and add the jQuery plugin in your page, rather into head tag
<head>
<script type="text/javascript" src="jquery.js"></script>
</head>
Good work and don't give up! (:
You can do this using AJAX (asynchronous JavaScript and XML), which is really just a fancy term for "sending stuff to a server with JavaScript and getting a response back, without reloading the page". There's nothing special about AJAX; it just involves using plain old JavaScript to send an HTTP request.
Check out jQuery, a JavaScript library that handles most of the technical stuff for you. Specifically, look at its post() function, which allows you to send data to a PHP script using the $_POST system variable. There are lots of clear examples on that page.
Note that you don't need jQuery to use AJAX; jQuery is just a library that makes things easier. If you really want to learn how the JavaScript side of AJAX works, try following one of the many tutorials out there, such as Mozilla's or this one.
AJAX is the answer you're looking for.
It sounds like you already have a basic understanding of this, but to clarify, Javascript executes on the client side, and PHP executes on the server side. So you would have to make a call back to your server in order to interact with PHP/MySQL.
The purpose of AJAX is to do this without requiring a page refresh.
I'm currently working on a website and I would like to be able to do the following:
when clicking one of the links from the sideMenu the only thing I would like to change would be the content of my contentMain div and nothing else(page layout/design/etc)
Could anybody give me some general pointers on how I could achieve this in php?
Thank You in advance :D
This is a client-side change that cannot be accomplished using PHP. PHP is evaluated on the server-side, so once the page is loaded for the user, it has no control over what the user sees (unless you use client-side code to call PHP).
To accomplish this, you will need to use Javascript and/or jQuery.
Reference: https://developer.mozilla.org/en/JavaScript/
jQuery: http://jquery.org/
iFrame, frameset or AJAX all work for your case depending on what you are actually trying to achieve.
For AJAX calls (the most modern way out of the three that relies on Javascript) you can use a library such as jQuery.
http://api.jquery.com/category/ajax/
You can use ajax for this one. Using jQuery to detect the click on the link or use normal JavaScript onClick function. Then do the things like you want.
<a href="" id="my_link">My link<a>
<script type="text/javascript">
jQuery(document).ready(function(){
jQuery('#my_link').click(function(){
jQuery.ajax({
url: 'ajax page need to be called',
success: function(data) {
//do your operations on success
}
});
});
});
</script>
You can get more details on :
jQuery
jQuery Ajax
Hope this helps you
echo "<a href=#> Delete </a>";
Whenever a user hits Delete, a javascript function should be called for confirmation. Somewhere in the Javascript function, php code should be used for delete operation. How do I do that? Use something like "some php code goes here" and "some javascript function();" for me to know where to put what. Thanks.
This assumes that you are using jQuery...
<a href='javascript:delete();'>Delete</a>
<script type="text/javascript">
function delete()
{
$.post("/your_script.php", {}, function(result) {
});
}
</script>
JavaScript functions execute on the client (in the browser) and PHP executes on a server. So, the JavaScript must send a message - via HTTP - to the server to be handled by PHP. The PHP would perform the delete. Make sense?
The message sent to the server might be sent via AJAX.
Maybe you should use Ajax: http://en.wikipedia.org/wiki/Ajax_%28programming%29
PHP is a server-side technology, while JS is a client-side. They cannot interact with each other - in other words: they're completely independent.
PHP can only output code that is a JS code:
echo 'document.getElementById("test").appendChild(document.createTextNode("' . $myVar . '");';
It's all PHP can do. JavaScript cannot direct interact with PHP as well. You'll have to use AJAX to send a new HTTP request and process returned data.
PHP is a server-side language, thus you can not output PHP script to the browser and expect that it will parse it with the PHP engine.
What you're looking for is probably AJAX, or simply redirecting the user to another page (with different URL parameters) or submitting a form.
AJAX doesn't require from the browser to reload the page, while the two other methods does.
Anyway, you can execute a JS script with the "onclick" method, that's executed when the user clicks on the element: Delete
But the following approach looks better and considered as an ideal one:
Delete
<script type="text/javascript">
document.getElementById("myId").onclick = myFunc;
</script>
Since this involves Ajax, let's assume you can use jQuery to handle the XHR an so on.
<script>
$('#del').click(function(ev){
ev.preventDefault();
var del_conf=confirm('Are you sure you want to delete this item?');
if(del_conf){ $.post('delete.php',{'del':1,'id':123123},function(data){
alert(data.result);},'json');
}
});
</script>
<a id='del'>Delete</a>
Okay, so that's some JS and HTML. Now, you need a separate PHP script to handle the post. To go with the example, this would be saved in the same directory, named 'delete.php'.
<?php
$del=(int)$_POST['del'];
$id=(int)$_POST['id']
if($del<1 || $id<1){ exit; }
else{
//do your DB stuff
}
if($db_success){
echo json_encode(array('result'=>'success'));
}
else{
echo json_encode(array('result'=>'error'));
}
here is another example using jQuery:
<div id="message"></div>
<a class="action" type="delete" rel="1234567">delete</a>
<script type="text/javascript">
$('a.action').click(function(){
var $this = $(this);
var processResponse = function(data){
//optionaly we can display server response
$('#message').html(data);
return;
};
var postPparams = {
module:'my_module_name',
action:$this.attr('type'),
record_id: $this.attr('rel')
};
$.post('/server.php',postPparams, processResponse);
});
</script>