fadeTo( speed, opacity, callback ) Method



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.


Following is a simple example a simple showing the usage of this method −

      <title>The jQuery Example</title>
      <script type = "text/javascript" 
         src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
      <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 {background-color:#bca; width:200px; 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/jquery.jpg" alt = "jQuery" />
      <div class = "log"></div>

This will produce following result −