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RichardZ

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Posts posted by RichardZ

    jQuery .animate: how to increase .height by a given percent

    in JavaScript

    Posted 

    <!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script> 
$(document).ready(function(){
    $("button").click(function(){
        var div = $("div");
        div.animate({height: '300px', opacity: '0.4'}, "slow");
        div.animate({width: '300px', opacity: '0.8'}, "slow");
        div.animate({height: '100px', opacity: '0.4'}, "slow");
        div.animate({width: '100px', opacity: '0.8'}, "slow");
    });
});
</script> 
</head>
<body>

<button>Start Animation</button>

<p>By default, all HTML elements have a static position, and cannot be moved. To manipulate the position, remember to first set the CSS position property of the element to relative, fixed, or absolute!</p>

<div style="background:#98bf21;height:100px;width:100px;position:absolute;"></div>

<div style="background:red;height:50px;width:50px;position:absolute;"></div>

</body>
</html>

    Hi All,

     

    I've been working through W3 Schools tutorial on jQuery. I worked my way down to the topic on .animate (http://www.w3schools.com/jquery/jquery_animate.asp). For Example 1, of the "Use Queue Functionality", I thought I'd try experimenting with the code, and modified it to add a small red square on top of the large green one (see attached code).

     

    I want the red square to change size as the green square changes size, but maintain its size relative to its larger sibling.

     

    I can make this happen if I 'ID=' each square and give each the appropriate numeric value, but this isn't exactly flexible/generic.

     

    I can use something like '+=100px' and '-=100px', but this clearly adds the same amount to both squares, and naturally the red square doesn't stay relatively sized to the green square.

     

    Using something like '*=2.0' just silently fails.

     

    Anybody have any suggestions?

     

    Thanks,

     

    Richard

     

     

     

     

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