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script.aculo.us Sliders onChange Option
  • Last Updated : 30 Dec, 2020

The script.aculo.us library is a cross-browser library that aims at improving the user interface of a website. The Slider controls are thin tracks that allow the user to input values. It is done by defining a range of values that can be selected by the user by dragging the handle to the appropriate value.

The onChange option is used to specify a callback function that would be invoked whenever the value of the slider changes, either when the slider has finished moving or using the setValue() method to set a new value. The current value of the slider would be passed as a parameter to the function.

Syntax:

{ onChange: function }

Parameters: This option has a single value as mentioned above and described below:

  • function: This is a callback function that would be invoked whenever the slider has finished moving or has been changed using the setValue() method.

The below example illustrates the use of this option.



Example:

HTML




<!DOCTYPE html>
<html>
<head>
  <!-- Include the required scripts -->
  <script type="text/javascript" 
          src="prototype.js">
  </script>
  <script type="text/javascript"
          src="scriptaculous.js?load = slider">
  </script>
  
  <!-- Style the Sliders so that they
  are properly visible -->
  <style type="text/css">
    .track {
      width: 250px;
      background-color: orange;
      height: 5px;
      position: relative;
    }
  
    .track .handle {
      width: 20px;
      height: 10px;
      background-color: green;
      cursor: move;
      position: absolute;
      top: -2px;
    }
  
    .pad {
      padding: 25px 15px;
    }
  </style>
</head>
<body>
    
<p>
  <h1 style="color: green;">
    GeeksforGeeks
  </h1>
  <h2>Sliders onChange Option</h2>
    
<p>
    The onChange callback function 
    gets invoked whenever the value
    changes. The value of the slider 
    can be set using the setValue method.
  </p>
  
  
  <div class="pad">
    <div id="track-hor" class="track">
      <div id="handle-hor" class="handle">
      </div>
    </div>
  </div>
  
  <input type="text" id="val">
  <button onclick="setVal()">
    Set Value
  </button>
  
    
<p>Current Slider Value: 
    <span id="out">0</span>
  </p>
  
  
  <script type="text/javascript">
  
    // Initialize the slider
    let slider = new Control.Slider('handle-hor',
      'track-hor', {
        
      // Define the range
      range: $R(1, 100),
  
      onChange: function (currValue) {
        document.querySelector("#out")
                  .textContent = currValue;
      }
    });
  
    function setVal() {
  
      // Get the value form the input box
      let val =
          document.querySelector("#val")
                    .value;
  
      // Set the value of the slider
      // to the given value
      slider.setValue(val);
    }
  </script>
</body>
</html>

Output:




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