jQuery Effect - fadeTo() Method

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The fadeTo( ) method fades the opacity of all matched elements to a specified opacity and firing an optional callback after completion.


Here is the simple syntax to use this method:


selector.fadeTo(speed, opacity[, callback]);


Here is the description of all the parameters used by this method:

  • speed: A string representing one of the three predefined speeds ("slow", "def", or "fast") or the number of milliseconds to run the animation (e.g. 1000).

  • opacity: A number between 0 and 1 denoting the target opacity.

  • callback: This is optional parameter representing a function to call once the animation is complete.



   <script type="text/javascript"  src="../../js/jquery-2.2.0.js"></script>
   <script type="text/javascript" language="javascript">
    $(document).ready(function() {
         $(".target").fadeTo( 'slow', 0.7, function(){ 
             $(".log").text('More Opacity Transition Complete');
         $(".target").fadeTo( 'slow', 0.2, function(){ 
             $(".log").text('less Opacity Transition Complete');
      p {
           border:1px solid green; 
   <p>Click on any of the buttons</p>
   <button id="less"> Less Opacity </button>
   <button id="more"> More Opacity</button> 
   <div class="target">
      <img src="../../images/jsquery.png" alt="jQuery" />
   <div class="log"></div>
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