I have a friend who call his clients by phone. He want to present his product on his website.
But to be sure they look at the product he want to sell, he want them to go to a page where he can change images by demand. Like running a powerpoint presentation in the clients browser.
If the client for example need other features he can show another image.
During phone call client go to a specific page on my friends website.
The image shown, or html data, change on demand by my friend.
Can this be implemented easily by AJAX?
Sure!
Client side:
<script type="text/javascript">
//The first image to load
CurrentImage="http://images.google.com/intl/en_ALL/images/logos/images_logo_lg.gif";
//The Image, eg: <img id=imgBox src=foo.jpg>
ImgBox = document.getElementById('imgBox');
function CheckForImg()
{
var ajaxRequest; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
try
{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Ajax is kinda disabled :(\n you won't be able to do some stuff around :(");
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
var str = ajaxRequest.responseText;
if(str != CurrentImage) // we have a new image
{
ImgBox.src = str;
currentImage = str;
}
}
ajaxRequest.open("GET", "getCurrentImagUrl.php", true);
ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded")
ajaxRequest.send(null);
}
</script>
Now we need a way to keep the client posted, so either we put that to a frequency, or show a button to press which is way better and more efficient:
Method 1(Button):
<Button onclick="CheckForImg();">Check For Image!</button>
Method 2(Periodically check):
Simply call
SetInterval("CheckForImg", 5000);
I'll leave the server side for you :)
Any further help is kindly offered.
Related
I am working in a chat system that relies on a mysql database.
At the beginning of the first loading of the page sending the following query:
SELECT * FROM `Shoutbox` ORDER BY `Shoutbox`.`ID` ASC LIMIT 0 , 30
and then using a while loop mold all messages (with user names and date) in a div.
while($array=mysql_fetch_array($dati)) {
echo "<div class='tag_li $array[ID]'><span class='when'>$array[DateTime]</span><span class='linea mess'><span id='author'><a onclick='ajaxLoadContent(this)' link='profile.php?name=$array[User]'>$array[User]</a></span>: $array[Message]</span></div>";
}
Now I would like to be sent every second query, and then updates the contents of the div with new messages if any.
How can I send a SQL query in a range?
I will assume you are using javascript and want to make an ajax call.
Start with the timer on the client side
window.setInterval("ajaxFunction()",milliseconds);
And the ajax function
function ajaxFunction(){
var ajaxRequest; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
var ajaxDisplay = document.getElementById('ajaxDiv');
ajaxDisplay.innerHTML = ajaxDisplay.innerHTML + ajaxRequest.responseText;
}
}
ajaxRequest.open("GET", "ajax-example.php" , true);
ajaxRequest.send(null);
}
the php part
while($array=mysql_fetch_array($dati)) {
echo "<div class='tag_li $array[ID]'><span class='when'>$array[DateTime]</span><span class='linea mess'><span id='author'><a onclick='ajaxLoadContent(this)' link='profile.php?name=$array[User]'>$array[User]</a></span>: $array[Message]</span></div>";
}
And the html part
<div id="ajaxDiv"></div>
That should give you an idea how it is done.
I am trying to write the code to let users upload their profile picture using php. I want the image to be updated without reloading the page. I have tried using ajax to do this.
My ajax code is:
function f()
{
var ajaxRequest; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
x=document.getElementById("img"); //Find the element
x.innerHTML=ajaxRequest.responseText; //Change the content
}
}
ajaxRequest.open("POST", "Uploadimage.php", true);
ajaxRequest.send();
}
Uploadimage.php is the file in which uploads the image and moves it into a folder.The $_FILES has the details of the file(filename,type etc...).
The above code is not working i.e., the image is not getting updated.Please help me how to correct this.
Thank you.
Personally I would only return the new url name of the profile pic and change the src of the profile pic upon success. Such as:
x = document.getElementById('img'); // If this is the <img> tag
x.src = ajaxRequest.responseText;
Note that the url name of the new pic will need a new url, or else I don't think any browser will try to reload the pic, regardless of caching rules set by the server.
First off - NO JQUERY. I hate that thing with a passion and I can't possibly imagine how a native code implementation would be less efficient.
What I am after is a way to call any PHP function from Javascript and pass parameters to the function using call_user_func_array. I have written this exact code before but can't think of how I did it.
In the end, I want to be able to (in JS) be able to do something like:
var responseString = callPhpFunction(func, param1, param2, etc);
`
Which is an ideal and will probably involve a few nested functions. At the moment I have the basic Ajax request. Needs to be POST, and doesn't have to handle multiple requests simultaneously.
var lastResponse = '';
function phpFunction(funcName){
var ajaxRequest;
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject('Msxml2.XMLHTTP');
} catch (e) {
try{
ajaxRequest = new ActiveXObject('Microsoft.XMLHTTP');
} catch (e){
// Something went wrong
alert('Ajax/Browser problem!');
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
//Seems to work.
window.lastResponse = ajaxRequest.responseText;
}
}
ajaxRequest.open('POST', 'ajaxCall.php', true);
ajaxRequest.send('func='+funcName); //Need to generate parameters dynamically, not sure how to do that
}
This shouldn't be really complex, but I've never seen a good implementation of it.
Any ideas?
been working on a new site, and run into a problem.
I have an ajax loader on my main page, which loads a script every second to check if a background process is completed (usually 20 seconds-ish)
But, once the ajax script has executed (20 seconds later) it still refreshes every second.
I need to redirect the parent page to a new url, once the ajax script has finished its job.
My ajax code:
<script type="text/javascript">
function myFunction()
{
var ajaxRequest; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
document.getElementById("txtHint").innerHTML=ajaxRequest.responseText;
}
}
ajaxRequest.open("GET", "code/timer.php?file='.$file.'", true);
ajaxRequest.send(null);
}
</script>
<script type="text/javascript">
function forward(){
location.href=\'http://domain/newpage.html\';
}
function setTimer(){
set = setInterval( "myFunction()", 1000 );
}
</script>
the backslashes in forward(); are because my code is echoed from php.
i have tried a few codes, but the main one that should work (in child ajax element) is:
window.opener.forward();
would be greatful of any help you guys can provide... thanks
opener is only available in windows opened with javascript, call simply
forward();
but you should use another name for the function, there is a predefined method window.forward()
So I have a simple AJAX request (not JQuery):
function ajaxfunction(){
var ajaxRequest;
try{
ajaxRequest = new XMLHttpRequest();
} catch (e){
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
alert("Your browser sucks"); //error
return false;
}
}
}
ajaxRequest.open("GET", 'pull.php?ms='+new Date().getTime(), true);
ajaxRequest.send(null);
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
var ajaxDisplay = document.getElementById('ajaxDiv');
ajaxDisplay.innerHTML = ajaxRequest.responseText;
}
}
}
And I want the request to also pull pictures. Since the request is dynamic (the images shown will change) I do the request over and over. This, however, makes the images flicker. I tried <img src="foobar.jpg" style="visibility:none;" onLoad="this.style.visibility='visible';" /> but that doesn't really help. If anybody knows of any fix, thank you in advance. :D
Maybe instead of pulling then entire <img> tag in the ajax response just get the image name and properties to change the targeted image src, height, width, etc... properties to use the new image.
I wonder if including the image height and width in the style attribute of the img tag would help since it takes a split second for the browser to start downloading the image and get the actual image height and width.