Automatically generated Dropdown failing to respond to jQuery event

$(document).ready(function() {
    $('[id^=drop_id]').on('change', function() {
        selected = $(this).find('option:selected').data('tid')   
        $.getJSON('path/'+selected,function(data){
        var s = $("<select id='drop_id_goddamnit' name=\"name\" />");
        $(data).each(function() {
          var option = $('<option />');
          option.attr('value', this.taxon.permalink).text(this.taxon.name).attr('data-tid',this.taxon.id);
          option.appendTo(s);
        });
        $('#header').append($(s));
    });
  });
});

This snippet of code is designed to dynamically add a dropdown based on the value selected in an existing dropdown. The new dropdown also has the same change event listener to generate another dropdown. However, there seems to be an issue as the dynamically generated select box is not triggering the event. What should be done to resolve this problem?

Answer №1

Encountering event delegation, newly generated elements do not trigger the change event by default. Consider implementing it this way:

$(document).on('change', '[id^="drop_id"]', function(){
    //your code here.
});

Since the element was not present in the DOM when the document loaded, direct event binding will not apply to the newly added element. It is necessary to delegate the event either to the $(document), which serves as the parent of all other elements, or to the nearest existing parent that was available during DOM loading.

The revised code would be like this:

$(document).on('change', '[id^="drop_id"]', function() {
    selected = $(this).find('option:selected').data('tid')   
    $.getJSON('path/'+selected,function(data){
    var s = $("<select id='drop_id_goddamnit' name=\"name\" ></select>");
    $(data).each(function() {
      var option = $('<option></option>');
      option.attr('value', this.taxon.permalink).text(this.taxon.name).attr('data-tid',this.taxon.id);
      option.appendTo(s);
    });
    $('#header').append($(s));
});

Answer №2

Make sure to update your code by binding the event to an existing element in the DOM, then searching for child elements. It would be beneficial to learn about event delegation using the .on method.

Starting from jQuery 1.7, the .delegate() method has been replaced by .on(). However, for older versions, it still serves as a reliable way to implement event delegation. Further details on event binding and delegation can be found in the .on() method documentation.

Replace

$('[id^=drop_id]').on('change', function() {
with the following:

 $('#parentid').on('change', '[id^=drop_id]', function() {

The issue with your current code is that newly added elements do not inherit the bound event.

Learn more

Answer №3

The onchange event for the new drop down is not set anywhere. Currently, the only onchange binding occurs when the page is loaded. To ensure the onchange functionality works for the new dropdown, you need to explicitly bind it after it has been added to the page.

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