How to use callback method in jquery
This article mainly explains "how to use the callback method in jquery". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how to use the callback method in jquery.
In jquery, the callback method is passed as a parameter to the effect method, which executes after the current action is complete and is usually displayed as the last parameter of the method, with the syntax "$(selector) .hide (duration, easing, callback);".
The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.
How to use callback method in jquery
The JavaScript statement is executed line by line. However, because the jQuery effect takes some time to complete, the next line of code may be executed while the previous effect is still running. This can lead to errors.
To prevent this from happening, jQuery provides a callback function for each effect method.
When the current effect is complete, the callback function is executed.
Callback functions are passed as parameters of the effect method, and they are usually displayed as the last parameter of the method.
Typical syntax: $(selector) .hide (duration, easing, callback)
The following example has a callback parameter that is the function that will be executed after the hiding effect is complete:
Examples are as follows:
JQuery uses callback function example $(document) .ready (function () {$("button") .click (function () {$("p") .hide ("slow", function () {alert ("paragraph is now hidden");});}); hide
This is a paragraph.
Output result:
After clicking the button:
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