What steps can be taken to resolve the issue of "Uncaught TypeError: undefined is not a function"?

Check out the JSfiddle link for reference: http://jsfiddle.net/mostthingsweb/cRayJ/1/

Including my code below along with an explanation of what's going wrong:

This is a snippet from the HTML header, showing all the necessary links:

    <head>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
        <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/themes/smoothness/jquery-ui.css" />
        <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
        <link rel='stylesheet' href='test.css'/>
        <script src='test.js'></script>
    </head>

Below is the CSS styling:

.draggable {
    width: 80px;
    height: 80px;
    float: left;
    margin: 0 10px 10px 0;
    font-size: .9em;
}
.ui-widget-header p, .ui-widget-content p {
    margin: 0;
}
#snaptarget {
    height: 140px;
}
body, html {
    background: url('http://i.imgur.com/FBs3b.png') repeat;
}

And here's the JavaScript code:

$(document).ready(function() {
    $("#draggable5").draggable({
        grid: [80, 80]
    });
});

The issue arises when trying to drag the element on the page, resulting in an error: "Uncaught TypeError: undefined is not a function", pointing to line 2 of the JavaScript code. What could be causing this error?

Finally, here's the complete HTML structure:

<!DOCTYPE html>
<html>
<head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/themes/smoothness/jquery-ui.css" />
    <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
    <link rel='stylesheet' href='test.css'/>
    <script src='test.js'></script>
</head>
<body>
<div class="demo">
    <div id="draggable5" class="draggable ui-widget-content">
        <p>I snap to a 80 x 80 grid</p>
    </div>
</div>
</body>
</html>

Answer №1

I copied and pasted the code you provided into a local HTML file, and I had success running it without any issues. I did not include the test.js file but instead pasted the code within script tags just before the closing body tag. Below is the complete file that I tested in Chrome only:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Test</title>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/themes/smoothness/jquery-ui.css" />
    <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
    <link rel='stylesheet' href='test.css'/>
    <style type="text/css">            
        .draggable {
            width: 80px;
            height: 80px;
            float: left;
            margin: 0 10px 10px 0;
            font-size: .9em;
        }
        .ui-widget-header p, .ui-widget-content p {
            margin: 0;
        }
        #snaptarget {
            height: 140px;
        }
        body, html {
            background: url('http://i.imgur.com/FBs3b.png') repeat;
        }            
    </style>
</head>
<body>
    <div class="demo">
        <div id="draggable5" class="draggable ui-widget-content">
            <p>I snap to an 80 x 80 grid</p>
        </div>
    </div>
    <script type="text/javascript">
        $(document).ready(function() {
            $("#draggable5").draggable({
                grid: [80, 80]
            });
        });
    </script>       
</body>

Answer №2

It seems like the issue could be related to the placement of your jquery and js files within the head section of your code. The javascript may be trying to access $(#draggable5) before it has been fully loaded, resulting in an empty selector. Consider moving your scripts to right before the closing tag of your body element for better performance.

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