Encountering a problem where updating the selected option in a dropdown does not properly refresh the HTML

I am currently working with a dropdown menu containing countries.

Initially, the selected item is set to Ukraine.

<select id="country" name="country">
    <option value="US">USA</option>
    <option value="UG">Uganda</option>
    <option value="UA" selected>Ukraine</option>
    <option value="AE">United Arab Emirates</option>
    <option value="GB">United Kingdom</option>
</select>

Using the following jQuery code, I intend to select a different country:

$("select#country").val("GB");

Although the dropdown now displays United Kingdom, the HTML still indicates that Ukraine is the selected country. I need this discrepancy resolved.

I have tested various solutions, but none seem to work:

  1. Adding the .change() function caused the webpage to enter an infinite loop of refreshing.

    $("select#country").val(selectedOption).change();

  2. Attempting different jQuery codes resulted in no change.

    $("#country option[value="GB"]").attr('selected', 'selected');

  3. Trying to use the .selectmenu('refresh') function required updating jQuery, which was not possible for me.

    $("#country").selectmenu('refresh');

EDIT: The issue was not related to jQuery. It turned out to be a problem with how the HTML was being displayed.

<xsl:for-each select="$country"> 
    <xsl:attribute name="selected">
        <xsl:text>selected</xsl:text>
    </xsl:attribute>
</xsl:for-each>

Initially, the list was printed with the selected country. Subsequently, the list underwent sorting (which I had overlooked). This sorting altered the list order without affecting the selected country. It was a timing issue, as outlined in the correct answer.

Thank you!

javascriptjqueryhtmlxsltdrop-down-menu

Answer №1

It seems like your issue stems from timing conflicts. The select element needs to be present before running the script. Additionally, jQuery must also be loaded before executing the script.

No change event trigger is necessary for typical select value changes.

Check out this JSFiddle link for a demo.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="country" name="country">
    <option value="US">USA</option>
    <option value="UG">Uganda</option>
    <option value="UA" selected>Ukraine</option>
    <option value="AE">United Arab Emirates</option>
    <option value="GB">United Kingdom</option>
</select>
<script>$("#country").val("GB")</script>

As a helpful tip: If you have an ID attribute, tag filtering is unnecessary—simply use $('#id'). IDs should be unique by definition on a page.

Answer №2

Try using the trigger('change');

$('#btn1').click(function() {
  $('#country').val('UG').trigger('change');
});
$('#btn2').click(function() {
  $('#country').val('AE').trigger('change');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="country" name="country">
    <option value="US">USA</option>
    <option value="UG">Uganda</option>
    <option value="UA" selected>Ukraine</option>
    <option value="AE">United Arab Emirates</option>
    <option value="GB">United Kingdom</option>
</select>
<button id='btn1' />1</button>
<button id='btn2' value='2'>2</button>

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