What is the use of the "OnChange" attribute in PHP form elements?

The "OnChange" attribute in PHP form elements is used to trigger a JavaScript function when the value of the form element is changed. This is useful for dynamically updating other elements on the page based on the user's input without requiring a page refresh. By using the "OnChange" attribute, you can enhance the user experience and make your forms more interactive. 

<form>
  <select name="dropdown" onChange="updateValue(this.value)">
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
  </select>
</form>

<script>
function updateValue(value) {
  // Perform actions based on the selected value
  console.log("Selected value: " + value);
}
</script>

Keywords

OnChange attribute PHP form elements event handler

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