Ways to show the existing value of a <select> in a label without altering the function

I currently have a label that changes to display the selected option from a dynamic select dropdown, but it only updates when the selection is changed. I would like it to also display the current value when the page first loads. I attempted to change 'change' to 'load' without success. Here is my current setup:

Array.prototype.forEach.call(document.getElementsByName('filename'), function(elem) {
  elem.addEventListener('change', function() {
    document.getElementById('mylabel').innerHTML = this.value;
  });
});
<select class="select1" name="filename" id="filename">
  <option>foo</option>
  <option>bar</option>
</select>
<label id="mylabel"></label>

Answer №1

When the webpage is loaded, all you have to do is...

<body onload="mytext.innerHTML=filetitle.value;">

Answer №2

I have made the necessary adjustments, including placing the line outside the function.

Array.prototype.forEach.call(document.getElementsByName('filename'), function(elem) {
  elem.addEventListener('change', function() {
    document.getElementById('mylabel').innerHTML = this.value;
  });
});
document.getElementById('mylabel').innerHTML = document.getElementById('filename').value;
<select class="select1" name="filename" id="filename">
  <option>foo</option>
  <option>bar</option>
</select>
<label id="mylabel"></label>

Answer №3

Utilizing the Array prototype forEach method, we can loop through elements with the name 'filename' and add an event listener for when they change. Once the change event occurs, the value of the element will be displayed in the 'mylabel' element.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select class="select1" name="filename" id="filename">
  <option>foo</option>
  <option>bar</option>
</select>
<label id="mylabel"></label>

Answer №4

What is the purpose of the loop?

let element = document.getElementById("filename");
let label = document.getElementById('mylabel');

document.addEventListener('DOMContentLoaded',function(){
   label.innerHTML = element.value;    
   element.addEventListener('change', function(){
      label.innerHTML = this.value;
   });
});
<select class="select1" name="filename" id="filename">
  <option>foo</option>
  <option>bar</option>
</select>
<label id="mylabel"></label>

Answer №5

To practice the DRY principle (Don't Repeat Yourself), assign a name to the click handler and then trigger it manually upon initialization. Alternatively, you can manually trigger the change event during initialization.

Sample Code:

$(function() {
  // Assign event handler for change
  $('#filename').change(mylabel_update);

  // Update mylabel to display filename
  function mylabel_update() {
    $('#mylabel').html($('#filename').value);
  } 

  // Initialization option A - Directly call the function
  mylabel_update();

  // Initialization option B - Force the change event (no need for a named function)
  $('#filename').trigger('change');
});

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