JS causes the navigator to malfunction

UPDATE:

Greetings! I have developed a navigation bar that loads various pages into a specific div. Here is the source code for the navigation bar:

<div id="navBar">
<ul>
    <li><a href="#" onClick="document.getElementById('bottom').innerHTML = loadPage('hello-world.html');">Home</a></li>
    <li><a href="about.php" onClick="document.getElementById('bottom').innerHTML = loadPage('hello-world.html');">Staff</a></li>
    <li><a href="goodies.php" onClick="document.getElementById('bottom').innerHTML = loadPage('hello-world.html');">Goodies</a></li>
    <li><a href="stuff.php" onClick="document.getElementById('bottom').innerHTML = loadPage('hello-world.html');">Events</a></li>
    <li><a href="#/contact.php" onClick="document.getElementById('bottom').innerHTML = loadPage('load.php');">News</a></li>
    <li><a href="#" onClick="document.getElementById('bottom').innerHTML = loadPage('hello-world.html');">Games Center</a></li>
    <li><a href="phptesting.php" onClick="document.getElementById('bottom').innerHTML = loadPage('hello-world.html');">Habbo</a></li>
</ul>

This is the designated div where the text is placed:

    <!-- Main Body -->
<div id="right">
<a id="bottom">
</div></a>

Next, here is the javascript function that retrieves the file and inserts it into the div:

function loadPage(href)
            {
                var xmlhttp = new XMLHttpRequest();
                xmlhttp.open("GET", href, false);
                xmlhttp.send();
                return xmlhttp.responseText;
            }

At this point, when a navigation item like "Home" is clicked, the corresponding text loads within the designated div. However, when I add this additional code to load the text when the page loads:

<script>
function loadXMLDoc(filename) {
    var xmlhttp;
    if (window.XMLHttpRequest)  {
      xmlhttp=new XMLHttpRequest();
    }
    else {
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange=function() {
      if (xmlhttp.readyState==4 && xmlhttp.status==200) {
        after_load_function(xmlhttp.responseText);
      }
    }
    xmlhttp.open("GET",filename,true);
    xmlhttp.send();
    }

    function after_load_function(responseText) {
      document.getElementById("right").innerHTML = responseText;
    }

    window.onload = function() {
      loadXMLDoc("welcome.html");
    }
</script> 

Unexpectedly, this causes the pages to stop loading altogether. However, removing the code allows the functionality to return. Any suggestions or ideas on why this is occurring?

Answer №1

Have you considered leveraging jQuery for better cross-browser compatibility? While native JavaScript is effective, it may not always be the best choice for ensuring consistency across different browsers. Experiment with jQuery to see if it can resolve any compatibility issues you may be facing.

Answer №2

Can you tell me where your loadPage() function is defined? Does the loadPage() function call the loadXMLDoc() function? If it does, then:

1- I noticed that your AJAX callback function does the following:

function after_load_function(responseText) {
    document.getElementById("right").innerHTML = responseText;
}

2- However, in your loadPage() function, you are also assigning like this:

onClick="document.getElementById('bottom').innerHTML = loadPage('hello-world.html');"

But, in your first assignment, the HTML content of "right" has been changed. There is no longer a "bottom" element, so an exception will be thrown in the second assignment.

<div id="right">
<a id="bottom">
</a></div>

I believe this is why your page has stopped working.

UPDATE You can achieve the same result with jQuery like this:

function loadPage(pageToLoad) {
    $.ajax({
        url: pageToLoad,
        complete: function(res) {
            $('#bottom').html(res.responseText);
        }
    });
}

And then call it like this:

onClick="loadPage('hello-world.html');"

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