The div element halts the execution of a javascript function

My task involves creating a JavaScript function that updates a database table when a form item is selected. The functionality works perfectly fine.

Javascrpit:


function changeFunc(){
 var selectBox = document.getElementById("supervisor");
 var selectedValue = selectBox.options[selectBox.selectedIndex].value;
 if(selectedValue === 1){
     var jqxhr = $.ajax("<?php echo $web_root; ?      
  >/file/reminder/supervisor_reminder.php?super=1")
         .done(function(){ alert("success, supervisor Helen has    
   been alerted."); })
         .fail(function(){ alert("error"); });
    }
}

HTML:


<div id="supervisor">
<form action="" method="">
    <label>Supervisor Alert</label>
        <select id="supervisor" onchange="changeFunc()">
            <option value=""></option>
            <option value="1">Helen</option>
            <option value="2">Nancy</option>
            <option value="3">Joyce</option>
            <option value="4">Bob</option>
            <option value="5">Herb</option>
        </select>    
  </form>
  </div>

Upon wrapping the form with the div tags, the JavaScript function ceases to work. I intended to hide the form once the table update is complete, hence the wrapping in a div for that purpose. However, this interferes with the functionality of the JavaScript. Any insights on why this might be happening or how I can achieve the form hiding using CSS would be greatly appreciated.

Answer №1

You currently have a situation where two elements share the same ID. To resolve this issue, you should update the outermost element to

<div id="supervisorContainer">

Answer №2

It is important to remember that the ID supervisor should only be used once!

For example, you can update <div id="supervisor"> to <div id="supervisorBox"> and then use #supervisorBox to hide this box.

Here is how you can do it:

$("#supervisorBox").hide();

Answer №3

To avoid conflicts, ensure that the div and the select elements have unique ids. Each element should have its own distinct id for proper identification.

Answer №4

To avoid conflicts, make sure each HTML element has a unique ID. Consider modifying the ID of either your <div> or select.

Answer №5

The issue at hand is the utilization of the same ID for both the div and the select control.

It is imperative that IDs are unique. Otherwise, the system will default to the first instance, which in this scenario happens to be the div container.

Consequently, by having the DIV container with the same ID as the select control, your JS variable "selectBox" is referencing the DIV and not the desired select control.

Solution: Modify one of the IDs to a different (unique) value and ensure that the corresponding ID for the select control is utilized in your JavaScript code.

    <div id="supervisor_div">
    <form action="" method="">
        <label>Supervisor Alert</label>
        <select id="supervisor" onchange="changeFunc()">
            <option value=""></option>
            <option value="1">Helen</option>
            <option value="2">Nancy</option>
            <option value="3">Joyce</option>
            <option value="4">Bob</option>
            <option value="5">Herb</option>
        </select>    
    </form>
</div>

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