What should I do if jquery animation only displays once?

In web development, animation effects are a very common feature. In order to achieve these animations, we usually use jQuery, a powerful JavaScript library. jQuery provides many encapsulated animation functions, and it is very simple to use. However, in some special cases, we may encounter some troubles, such as when implementing jQuery animation, it can only be played once. So, how do we solve this problem?

Problem Description

Before understanding how to solve this problem, let's first take a look at the specific description of this problem. In some cases, we may need to use jQuery animation effects multiple times. For example, we might need to perform a fade-in effect when the user clicks a button. However, we need to perform the fade-in effect again when the user clicks the button again. In this case, if we simply use the fadein method, we will find that this animation can only be played once. That is, when we click the button again, the animation effect will not play again.

Solution

Before solving this problem, we need to first understand the principle of jQuery animation playback. In jQuery, animation effects are usually implemented by a series of CSS property changes. For example, in the fadein method, the transparency property of the element will gradually change from 0 to 1 to achieve the fade-in effect. When the animation completes, the element's transparency property will automatically be set to 1 instead of 0. That's why when the fadein method is called again, the animation doesn't play again.

In order to solve this problem, we need to restore the CSS properties of the target element to the state before the animation is executed each time. In this way, when the animation is performed again, the CSS property values ​​​​of the element will not be affected by the previous animation. The specific method is as follows:

First, we need to save the CSS property value of the element that needs to be animated in a variable. For example, we need to save the transparency attribute value of the element:

var opacity = $('#myElement').css('opacity');

Next, we need to execute Before animation, restore the element's CSS properties to their initial state. For example, we need to restore the element's transparency property value to 0:

$('#myElement').css('opacity', '0');

Then, we can execute Corresponding animation effects. For example, we can perform a fade-in effect:

$('#myElement').fadeIn('slow');

Finally, after the animation is completed, we need to change the CSS of the element The property value reverts to the previously saved value. For example, we need to restore the transparency attribute of the element to the previously saved value:

$('#myElement').css('opacity', opacity);

In this way, execute it again During animation, the CSS property value of the element will not be affected by the previous animation, and the animation effect can be played normally.

Summary

When implementing jQuery animation effects, we may encounter some special situations, such as the situation where the animation can only be played once. To solve this problem, we need to restore the element's CSS properties to their initial state before performing the animation. In this way, when the animation is executed again, the CSS property value of the element will not be affected by the last animation, and the animation effect can play normally. I hope this article can be helpful to everyone.

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