Script malfunctioning following an AJAX request

My page consists of a header where all my javascript is located. Within the body of the page, there is a link that triggers an ajax http request using vanilla JavaScript (not jQuery). This request retrieves a PHP form and injects it onto my page.

The PHP form contains select dropdowns that are styled using jQuery. The issue I am facing is that when I directly include the form in the page, the select dropdown appears formatted correctly upon page load. However, when I remove the form from the page and bring it in via ajax, the styling does not apply as if the javascript is not loading.

It seems like the javascript is loaded during the initial page load but fails to work properly when the PHP form is fetched through ajax. The select dropdown loses its styling. It's almost like the javascript needs to be reloaded or something along those lines.

I am not utilizing jQuery for this ajax call, just plain old vanilla JavaScript.

function getPage(str)
 {
 if (str=="")
   {
   document.getElementById("center").innerHTML="";
   return;
   } 
if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
   }
 else
   {// code for IE6, IE5
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
 xmlhttp.onreadystatechange=function()
   {
   if (xmlhttp.readyState==4 && xmlhttp.status==200)
     {
     document.getElementById("center").innerHTML=xmlhttp.responseText;
     }
   }
 xmlhttp.open("GET","xhr_php/get_page.php?page="+str,true);
 xmlhttp.send();
 }

Answer №1

The jQuery styling script is executed and then completed. If you wish for it to run again following your AJAX call, place it within a function and invoke the function upon success.

function applyStyling() 
{
    $('selector').css('property', 'value');
}

In the event of a successful response with status code 200 and readyState 4 from your AJAX request, make your JavaScript CSS adjustments after inserting the HTML response.

xmlhttp.onreadystatechange=function()
{
    if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
        document.getElementById("center").innerHTML=xmlhttp.responseText;
        applyStyling();
    }
}

Answer №2

Is the styling of the select elements done by a script that executes when the page loads? If that's the case, this could be causing issues. Loading the form via ajax after the page has loaded ensures that the onload scripts won't impact the selects. Make sure to run the scripts only after the form is completely loaded.

Answer №3

If you're encountering issues with your code, I recommend utilizing either the jQuery method .live() or .bind() to bind interactive behaviors to your elements. It is crucial to ensure that any functionalities like datepicker on a PHP form page are properly reassigned to the elements retrieved through an XHR request in the callback function of the XHR request.

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