Call Javascript function after AJAX load

Question

I know that these kind of questions pop up a lot on here. I usually am not the type to ask questions but this time I could not find a solution through searching.

I have boiled down my problem to a very small and simple environment:

I have 3 files:

Index.php:

<html>
<html xmlns="http://www.w3.org/1999/xhtml">
<script src="javascript.js"></script>
<head>
    <title>Test</title>
</head>
<body>
<div>
    <input type="button" value="Show" onclick="show('content','content.php');">
    <script type="javascript/text">
        show('content','content.php');
    </script>
    <br>
    <div id="content"></div>
</div>

content.php

<div>CONTENT</div>
<input type="checkbox" id="checkbox" onclick="checkbox();">
<input type="text" id="textfield">

And javascript.js

function show(divcontainer,file){
var xmlhttp;
if (window.XMLHttpRequest) {
        xmlhttp = new XMLHttpRequest();                     
    } 
    else {                                                  
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
        xmlhttp.onreadystatechange = function() {
            if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { 
                    document.getElementById(divcontainer).innerHTML=xmlhttp.responseText;
                }
            }
            xmlhttp.open("GET", file);                  
            xmlhttp.send();         
}
function checkbox(){
    if(document.getElementById('checkbox').checked){
        document.getElementById('textfield').value = "checked";
    }
    else{
        document.getElementById('textfield').value = "unchecked";
    }
}

When I press the button in index.php it loads the file content.php into the div container "content" via an ajax call. The file content.php has a checkbox and a textfield. When the checkbox is checked and unchecked it executes a javascript function that puts checked/unchecked in the textfield. Simple enough and everything works fine. Now what I want to do is to call the function checkbox() the moment that content.php is loaded. In this example it would mean that the textbox would already have the value "unchecked" and not only after the checkbox has been checked and unchecked again.

Putting the javascript code into the file content.php didn't do anything.

Somehow I feel that there must be a simple solution to this. I'm still pretty new to javascript though so I don't know the in and outs yet.

Any help would be greatly appreciated

Many thanks!

Why you don't use a lib like jQuery to perform ajax requests? — TiMESPLiNTER
– TiMESPLiNTER, Commented Oct 31, 2013 at 8:40
No particular reason. When I started this was the solution I found to work good for me and I sticked to it ever since. Will try it now though :) — Laurin Stahl
– Laurin Stahl, Commented Oct 31, 2013 at 8:58
With a JS lib you would have a (more or less) roch solid cross browser solution. So I recommend to you to use a lib. It also decrease the amount of code to write. — TiMESPLiNTER
– TiMESPLiNTER, Commented Oct 31, 2013 at 9:06

Nauphal · Accepted Answer · 2013-10-31 08:41:35Z

2

Try this

   if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { 
        document.getElementById(divcontainer).innerHTML=xmlhttp.responseText;
        checkbox();
   }

answered Oct 31, 2013 at 8:41

Nauphal

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1 Comment

Laurin Stahl Over a year ago

That works like a charm! Now I was wondering - is there also some way to have the function executed through the content.php? I'm asking because I have a script which would require just that.

웃웃웃웃웃 · Accepted Answer · 2013-10-31 08:47:31Z

0

if you´re new to JS you should definitely have a look at jQuery. Makes AJAX alot simpler.

$.ajax({
    url: youURL, 
    success: function (){
        //or whatever function you want to be called after success :)
    }
});

edited Oct 31, 2013 at 8:47

웃웃웃웃웃

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answered Oct 31, 2013 at 8:45

invad0r

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