Detailed explanation of jQuery queue control method queue()/dequeue()/clearQueue()_jquery

Let’s first explain the meaning of each of these methods.
queue(name,[callback]): When only one parameter is passed in, it returns and points to the queue of the first matching element (which will be A function array, the queue name defaults to fx); when two parameters are passed in, the first parameter still defaults to the queue name of fx, and the second parameter is divided into two situations. When the second parameter is a function, it will add a function at the end of the queue of matching elements. When the second parameter is a function array, it will replace the queue of matching elements with a new queue (function array). Maybe, this can be understood I’m a little confused. Later, there will be Click here to view the DEMO.
dequeue(name): This is easy to understand, it is to remove a queue function from the front of the queue, and Execute it.
clearQueue([queueName]):This is a new method in 1.4. Clear all queues that have not been executed on the object. The parameters are optional and the default is fx. But I personally feel that this method does not How useful is it? You can use the queue() method to pass in the second parameter of the two parameters to implement the clearQueue method.
Now, we want to achieve such an effect. There are number squares marked from 1 to 7. These seven are required The blocks fall sequentially from left to right.Click here to view the DEMO

I won’t post the css and html parts, they are included in the DEMO. If According to conventional practice, you may need to use the following jQ code to implement:

Copy code The code is as follows:

$('.one').delay(500).animate({top:' =270px'},500,function(){
$('.two').delay(500).animate({ top:' =270px'},500,function(){
$('.three').delay(500).animate({top:' =270px'},500,function(){
$('.four').delay(500).animate({top:' =270px'},500,function(){
$('.five').delay(500).animate({top :' =270px'},500,function(){
$('.six').delay(500).animate({top:' =270px'},500,function(){
$ ('.seven').animate({top:' =270px'},500,function(){
alert('Sequential falling movement ends! Yeah!')
});
} );
});
});
});
});
});

Well, yes, the effect is perfect It is presented, but can you bear this dizzy code? Even if you can bear it, if at this time, you want to change a certain execution order, for example, you want 5 to fall before starting to fall 3, or What should I do after adding eight new squares from 8 to 15? Rewrite? Be careful about the changes in it? Obviously, we need another concise and convenient method to achieve this effect, and that is the jQuery queue control method. Please Look at the following code:

Copy code The code is as follows:

var _slideFun=[
function (){$('.one').delay(500).animate({top:' =270px'},500,_takeOne);},
function(){$('.two').delay (300).animate({top:' =270px'},500,_takeOne);},
function(){$('.three').delay(300).animate({top:' =270px '},500,_takeOne);},
function(){$('.four').delay(300).animate({top:' =270px'},500,_takeOne);},
function(){$('.five').delay(300).animate({top:' =270px'},500,_takeOne);},
function(){$('.six') .delay(300).animate({top:' =270px'},500,_takeOne);},
function(){$('.seven').delay(300).animate({top:' =270px'},500,function(){
alert('Sequential falling movement ends! Yeah!');
});}
];
$('#demo') .queue('slideList',_slideFun);
var _takeOne=function(){
$('#demo').dequeue('slideList');
};
_takeOne();

In this way, it looks much simpler. How to implement it?
1. Create a new array and put the animation functions in order (is it convenient to change the order and add new animations in this way? More?);
2. Use queue to add this set of animation function array to the slideList queue;
3. Use dequeue to take out the first function in the slideList queue and execute it;
4. Initial Execute the first function.
There are also detailed comments in the DEMO demonstration. If you still don’t understand the above explanation, please look at the source code.
As for the clearQueue() method, I won’t say much more. The stop button is called in the demonstration. The clearQueue() method is used. Of course, you can also use the queue() method to directly replace the current function queue with an [] empty array (I personally recommend empty array replacement., more intuitive).

Original post On Mr.Think’s blog: http://mrthink.net/jqueyapi-queue-dequeue/