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Asked: 2026-05-26T17:45:57+00:00

I have an index.php file that loads other php files via this javascript/ajax code:

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I have an index.php file that loads other php files via this javascript/ajax code: 

function AJAX(elementID,url,showStatus){
var httpObject;
if (window.ActiveXObject) {
    httpObject = new ActiveXObject("Microsoft.XMLHTTP");
}
if (window.XMLHttpRequest){
    httpObject =  new XMLHttpRequest();
}
else {
    alert("Your browser does not support AJAX.");       
}

if (httpObject != null) {
    httpObject.onreadystatechange = function() {          
        if (elementID != false){                

            if (httpObject.readyState == 4 && httpObject.status == 200) {                  
                document.getElementById(elementID).innerHTML= httpObject.responseText;  

            } 
        }

    }

    httpObject.open("POST",url,true);
    httpObject.send(null);  
}
}

so for example I would load a file in inxex.php by:

<script>
AJAX("updateThisDiv", "/includes/contentpage.php", false)
</script>

which would paste the contents of “contentpage.php” into the div “updateThisDiv” but now if I have any javascript on “contentpage.php”, it will not run, is there any way to do this?

I have looked at this: http://www.javascriptkit.com/script/script2/ajaxpagefetcher.shtml
but its not exatcly what I was looking for.

I want to be able to update a section of my page without reloading the entire page and javascript must run

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1 Answer

  1. Editorial Team

    If you want to load Javascript on demand. This can be done by dynamically creating script tag. This pattern illustrated in Stoyan Stefanov book – Javascript Patterns

    This snipped from the book:

    Write a require function. Then call it like this:

    require("extra.js", function () {
    functionDefinedInExtraJS();
});

    Sample require function:

    function require(file, callback) {

    var script = document.getElementsByTagName('script')[0],
        newjs = document.createElement('script');

    // IE
    newjs.onreadystatechange = function () {
        if (newjs.readyState === 'loaded' || newjs.readyState === 'complete') {
            callback();
        }
    };

    // others
    newjs.onload = function () {
        callback();
    };
    
    newjs.src = file;
    script.parentNode.insertBefore(newjs, script);
}

    Live example found in http://www.jspatterns.com/book/8/ondemand.html

    @Edit: more details specific to your case. I will try to make things simple:

    Create four files:

    • index.php : the test file.
    • code.js : actual code which have Ajax, getJS, getHTML functions
    • content.php : any PHP file that will print pure HTML without any JS
    • content.js : javascript code that you want to run dynamically.

    index.php

    <html>
    <head>
        <script src="code.js"></script>
    </head>
    <body>
        <input type="button" onclick="Ajax('content.php', 'd_html');" value="Fill from content.php"/>
        <div id="d_html"></div>
        <br>
        <input type="button" onclick="Ajax('content.js', 'd_js');" value="Fill from content.js"/>
        <div id="d_js"></div>
    </body>
</html>

    content.php

    <span>Hello, I am dynamic span came from content.php</span>

    content.js

    //Ana javascript code you want to run it by Ajax function should go inside this function
function executeJS(element){
   element.innerHTML = "<span>Hello, I am dynamic span came from content.js</span>";
}

    code.js

    //This function responsible for doing the ajax request for any file that will return pure HTML.
function getHTML(url, element){
    var i, xhr, activeXids = [
        'MSXML2.XMLHTTP.3.0',
        'MSXML2.XMLHTTP',
        'Microsoft.XMLHTTP'
    ];

    if (typeof XMLHttpRequest === "function") { // native XHR
        xhr =  new XMLHttpRequest();        
    } else { // IE before 7
        for (i = 0; i < activeXids.length; i += 1) {
            try {
                xhr = new ActiveXObject(activeXids[i]);
                break;
            } catch (e) {}
        }
    }

    xhr.onreadystatechange = function () {
        if (xhr.readyState !== 4) {
            return false;
        }
        if (xhr.status !== 200) {
            alert("Error, status code: " + xhr.status);
            return false;
        }
        
        element.innerHTML += xhr.responseText;
    };

    xhr.open("GET", url, true); 
    xhr.send("");
}

//This function will load javascript file on-demand and call executeJS function inside that file.
function getJS(url, element, cb){
    var newjs = document.createElement('script');
    
    // IE
    newjs.onreadystatechange = function () {
        if (newjs.readyState === 'loaded' || newjs.readyState === 'complete') {
            cb();
        }
    };

    // others
    newjs.onload = function () {
        cb();
    };
    
    newjs.src = url;
    element.appendChild(newjs);
}


//This is same as your function, but now can handle both PHP and JS files
function Ajax(url, id){
    var element = document.getElementById(id),
        regex = /\.js$/;
    if(!element){
        alert("Invalid ID");
        return false;
    }

    if(regex.test(url)){ //If url ends with JS, load using getJS
        getJS(url, element, function(){
            executeJS(element);
        });
    } else {
        getHTML(url, element);
    }
}
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