JavaScript jQuery - is not defined- function error

0 votes

I am trying to run a JavaScript/jQuery function and Firebug gets the error:

$ is not defined $(function()".

The JavaScript code is placed inside a file called core.js and referenced by index.php. What causes this error?

JavaScript:

<script type="text/javascript">
    var formObject = {
        run : function(obj) {
            if (obj.val() === '') {
                obj.nextAll('.update').html('<option value="">----</option>').attr('disabled', true);
            } else {
                var id = obj.attr('id');
                var v = obj.val();
                jQuery.getJSON('/mod/update.php', { id : id, value : v }, function(data) {
                    if (!data.error) {
                        obj.next('.update').html(data.list).removeAttr('disabled');
                    } else {
                        obj.nextAll('.update').html('<option value="">----</option>').attr('disabled', true);
                    }
                });
            }
        }
    };

    $(function() {

        $('.update').live('change', function() {
            formObject.run($(this));
        });

    });
</script>

PHP/HTML

<html>
    <select name="main" id="category" class="update">
    <option value="">Select one</option>

        <? if (!empty($list)) { ?>
            <? foreach($list as $row) { ?>
                <option value="<?php echo $row['id']; ?>">
                    <? echo $row['name']; ?>
                </option>

            <? } ?>
        <? } ?>

    </select>
</html>

Jun 6, 2022 in JQuery by Edureka
• 13,670 points
1,933 views

1 answer to this question.

0 votes

You may experience the “jQuery is not defined error” when jQuery is included but not loaded. Make sure that it's loaded by finding the script source and pasting the URL in a new browser or tab. The snippet of text you should look for to find the URL to test.

answered Jun 6, 2022 by Edureka
• 13,670 points

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