The onChange event seems to be failing to activate during a jQuery / Ajax form submission

Differences in Form Submission Methods

The onChange event functions correctly with the traditional Type and Action method in both Firefox and Chrome.

<form name="frmname" action="./add_p.php" method="POST">
    <div>
        <select name="cbo_name" id="cbo_name" onChange="dosomething();">
            <option value="USA">America</option>
            <option value="CAN">Canada</option>
            <option value="UK">England</option>
        </select>
    </div>
</form>

Form submission using jQuery / Ajax

In this alternative method, the onChange event does not trigger. Instead, I have used onClick event which works well in both Firefox and Chrome browsers.

<form name="frmname" id="frmname" novalidate>
    <div>
        <select name="cbo_name" id="cbo_name" onClick="dosomething();">
            <option value="USA">America</option>
            <option value="CAN">Canada</option>
            <option value="UK">England</option>
        </select>
    </div>
</form>


Ajax call on the JS page

$.ajax({
.
.
})

Why does this difference exist? I am eager to explore the reasons behind it. Thank you

Answer №1

Your code is perfectly functional when utilizing the onChange event handler. Below you can find your verified code:

<form name="myForm" id="myForm" novalidate>
    <div>
        <select name="selection_box" id="selection_box" onChange="performAction(this.value);">
            <option value="USA">United States</option>
            <option value="CAN">Canada</option>
            <option value="UK">Britain</option>
        </select>
    </div>
</form>
<script>
    function performAction(val) {
        alert(val);
    }
</script>

Answer №2

The issue persists because the select box does not contain any options. For the onchange event to work, options are required. You can rectify this by adding the following code:

<form name="frmname" action="./add_p.php" method="POST">
    <div><select name="cbo_name" id="cbo_name" onChange="dosomething(this.value);">
            <option value="1">1</option>
            <option value="2">2</option>
        </select></div>
</form>
<script>
    function dosomething(value) {
        alert(value);
    }
</script>

Please let me know if you encounter any further issues.

Answer №3

Give this a try :

(insert your HTML code here)

<form name="frmname" action="./add_p.php" method="POST">
    <div>
        <select name="cbo_name" id="cbo_name" >
            <option value="USA">America</option>
            <option value="CAN">Canada</option>
            <option value="UK">England</option>
        </select>
    </div>
</form>

(JavaScript handler)

$(document).ready(function() {

     $("#cbo_name").change(function(e) {
        var cbo_nameValue = $(this).val();

        your.function.dosomething(cbo_nameValue);

    });

}

Answer №4

give this a shot

<select name="cmb_option" id="cmb_option" onChange="executeAction()">
     <option value="USA">United States</option>
        <option value="CAN">Canada</option>
        <option value="UK">United Kingdom</option>
</select>

Avoid using semicolons at the end of a function definition

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