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Introduce Jquery data(), Jquery stop(), jquery delay() functions one by one (details)_jquery

WBOYOriginal: 2016-05-16 15:33:561303browse

First, let me introduce the jquery data() function

The data() function in jQuery is used to append data to selected elements or obtain data from selected elements. The data accessed through the data() function is temporary data. Once the page is refreshed, the previously stored data will no longer exist.

1. The role of jquery data()

The data() method appends data to the selected element, or obtains data from the selected element.
The data accessed through the data() function is temporary data. Once the page is refreshed, the previously stored data will no longer exist.
This function belongs to a jQuery object (instance). If you need to remove the data stored through the data() function, please use the removeData() function.

2. How to use jquery data

1. Get the value of the attached data

$(selector).data(name)

Parameter description

name:

Optional. Specifies the name of the data to be retrieved.

If no name is specified, this method will return all stored data from the element as an object.

2. Use name and value to append data to the object

$(selector).data(name,value)

Parameter description

selector: an object that needs to append or obtain data.
name: The parameter is the name of the data.
value: The parameter is the value of the data.

3. Use objects to append data to elements

Add data to the selected element using an object with name/value pairs.
In addition to assigning values by providing name and value, we can also directly pass in another object ("another") as a parameter. In this case, the attribute name and attribute value of "another" will be treated as multiple key-value pairs, and the "name" and "value" extracted from them will be copied to the cache of the target object.

$(selector).data(object)

Parameter description

object: required. Specifies an object containing name/value pairs.

Example

<html>
<head>
<script type="text/javascript">
$(document).ready(function(){
 testObj=new Object();
 testObj.greetingMorn="Good Morning!";
 testObj.greetingEve="Good Evening!";
 $("#btn1").click(function(){
  $("div").data(testObj);
 });
 $("#btn2").click(function(){
  alert($("div").data("greetingEve"));
 });
});
</script>
</head>
<body>
<button id="btn1">把数据添加到 div 元素</button><br />
<button id="btn2">获取已添加到 div 元素的数据</button>
<div></div>
</body>
</html>

Then I will introduce to you the jquery stop() function

The stop() function in jQuery is used to stop the animation running on the currently matched element. By default, the stop() function only stops the currently running animation. If you use the animate() function to set three animations A, B, and C for the current element, if the currently executing animation is A, it will only stop the execution of animation A, and will not prevent the execution of animations B and C. Of course, you can also stop all animations by specifying optional options arguments.
The stop() function in jQuery is used to stop the animation running on the currently matched element.
Stopping the animation does not restore the state before the animation was executed, but stops it directly. The animation will stay in whatever state it is currently in.
For example: perform a transition animation of an element height from 100px to 200px, and stop the animation when the height is 150px, then the current height will still remain at 150px. If the animation sets a callback function after execution, the callback function will not be executed.

1. jquery stop() syntax

$(selector).stop(stopAll,goToEnd)

Parameter description

1. stopAll

Optional. Represents whether to clear the unfinished animation queue.
This means that if the parameter value is true, all subsequent animations or events will be stopped. If the parameter value is false, only the animation currently executed by the selected element will be stopped, and subsequent animations will not be affected. Therefore, this parameter is generally false.
If you use the stop() method, the currently running animation will be stopped immediately. If there is another animation waiting to be executed, the next animation will start with the current state.

2. goToEnd

Optional. Indicates whether to jump the currently executing animation directly to the end of the current animation.
Specifies whether to allow the current animation to be completed. This parameter can only be used when the stopAll parameter is set

3. Remarks

By default, if no parameters are written, both parameters will be considered false.

2. jquery stop() example

HTML code example

<!DOCTYPE>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>jquery stop()</title>
<script type="text/javascript">
$(function(){
  $("button:eq(0)").click(function(){
    $("#panel").animate({height:"150" }, 1000).animate({width:"300" },
      1000).hide(2000).animate({height:"show", width:"show", opacity:"show" }, 1000).animate({height:"500"},
      1000);
  });
  //stop([clearQueue][,gotoEnd]);
　　//语法结构
  $("button:eq(1)").click(function(){
    $("#panel").stop();//停止当前动画，继续下一个动画
  });
  $("button:eq(2)").click(function(){
    $("#panel").stop(true);//清除元素的所有动画
  });
  $("button:eq(3)").click(function(){
    $("#panel").stop(false, true);//让当前动画直接到达末状态 ，继续下一个动画
  });
  $("button:eq(4)").click(function(){
    $("#panel").stop(true, true);//清除元素的所有动画，让当前动画直接到达末状态
  });
})
</script>
</head>
<body>
<button>开始一连串动画</button>
<button>stop()</button>
<button>stop(true)</button>
<button>stop(false,true)</button>
<button>stop(true,true)</button>
<div id="panel">
  <h5 class="head">什么是jQuery&#63;</h5>
  <div class="content">
    jQuery。
  </div>
</div>
</body>
</html>

实例说明

1、点击按钮（stop()），由于两个参数都是false。所以点击发生时，animater没有跳到当前动画（动画1）的最终效果，而直接进入动画2，然后动画3，4，5.直至完成整个动画。

2、点击按钮（stop(true)），由于第一个是true，第二个是false，所以animater立刻全部停止了，动画不动了。

3、点击按钮（stop(false,true)），由于第一个是false，第二个是true，所以点击发生时，animater身处的当前动画（动画1）停止并且animater直接跳到当前动画（动画1）的最终末尾效果位置，接着正常执行下面的动画（动画2，3，4，5），直至完成整个动画。

3、点击按钮（stop(true，true)），由于两个都是true，所以点击发生时，animater跳到当前动画（动画1）的最终末尾效果位置，然后，全部动画停止。

三、jquery stop()在工作中的应用

一个下拉菜单，当鼠标移上去的时候就菜单显示，当鼠标离开的时候菜单隐藏，如果我快速不断地将鼠标移入移出菜单（即，当菜单下拉动画未完成时，鼠标又移出了菜单）就会产生“动画积累"，当鼠标停止移动后，积累的动画还会持续执行，直到动画序列执行完毕。

解决方法

在写动画效果的代码前加入stop(true，true)，这样每次快速的移入移出菜单，就正常了，当移入一个菜单的时候，停止所有加入队列的动画，完成当前的动画（跳至当前动画的最终效果位置）。

最后给大家介绍jquery delay()

jquery中delay()方法的功能是设置一个延时值来推迟动画效果的执行，它的调用格式为：$(selector).delay(duration)其中参数duration为延时值，它的单位是毫秒，当超过延时值时，动画继续执，delay与setTimeout函数还是有区别的，delay是更适合某些使用情况。

可以将队列中等待执行的下一个动画延迟指定的时间后才执行。它常用在队列中的两个jQuery效果函数之间，从而在上一个动画效果执行后延迟下一个动画效果的执行时间。

一、语法

$(selector).delay(speed,queueName)

1、参数说明

2、备注

延时时间（duration参数）是以毫秒为单位的，数值越大，动画越慢，不是越快。
字符串 'fast' 和 'slow' 分别代表200和600毫秒的延时。

二、delay()实例

HTML

<p>动画效果：
  <select id="animation">
    <option value="1">动画1</option>
    <option value="2">动画2</option>
    <option value="3">动画3</option>
    <option value="4">动画4</option>
  </select>
  <input id="exec" type="button" value="执行动画" >
</p>
<div id="myDiv" style="width:300px; height: 100px; background-color: #eee;">CodePlayer</div>
<script>
$("#exec").click( function(){
  var v = $("#animation").val();
  var $myDiv = $("#myDiv");
  if(v == "1"){
    $myDiv.slideUp( 1000 )
    .delay( "slow" )
    .fadeIn( 1500 );
  }else if(v == "2"){
    $myDiv.fadeOut( "slow" )
    .delay( 2000 )
    .slideDown( 1000 )
    .animate( { height: "+=300" } );
  }else if(v == "3"){
    /*
    注意：只有动画才会被加入效果队列中
    以下代码实际上只有slideUp()、slideDown()会加入效果队列
    delay()的延迟只对slideDown()起作用
    show()在被调用时就立即执行了(此时slideUp的动画效果尚未执行结束)
    以下代码的执行顺序时：
    1、slideUp()被加入队列、开始执行，
    2、show()也开始执行，它立即执行完毕，此时slideUp()的动画尚未执行结束
    3、延迟2秒
    4、执行SlideDown()
    */
    $myDiv.slideUp( "slow" )
    .delay( 2000 ) 
    .show( ) // 它不是一个效果动画
    .slideDown( );
  }else if(v == "4"){
    $myDiv.show()
    .delay( 2000 )
    // 在现有高度的基础上增加300px (如果原来是100px，增加后就是400px)
    .animate( { height: "+=300px" }, 2000 ) 
    .animate( { width: "50%" }, 1000 )   
    .animate( { width: "200px", height: "100px" }, 1000 );   
  }
} );
</script>

实例二、让页面中的按钮在页面加载后500毫秒隐藏，然后再过1500毫秒显示出来

$(function(){ 
var $inputs = $('input[type=button]') 
.delay(500) 
.queue(function(){$(this).hide().dequeue();}) 
.delay(1500) 
.queue(function(){$(this).show();}); 
});

三、jquery中使用delay()注意事项

1、delay适用在jQuery动画效果和类似队列中
2、如果下一项是动画效果，则会执行延迟调用
3、如果不是效果动画，则它不会被加入效果队列中，因此该函数不会对它进行延迟调用。
4、如果要将不是动画效果加入延迟，则需要将它加入到queue队列中去。

例如

$(function(){ 
var $inputs = $('input[type=button]') 
.delay(500) 
.queue(function(){$(this).hide();}) 
.delay(1500) 
.show(1); 
//.queue(function(){$(this).show();}); 
});

备注：上面方法只隐藏，不会再显示，queue执行完后，也中止了动画队列的继续执行，需要调用dequeue使其执行下去

又如

$(function(){ 
var $inputs = $('input[type=button]') 
.delay(500) 
.queue(function(){$(this).hide().dequeue();}) 
.delay(1500) 
.show(); 
//.show(1); 
});

备注：上面方法也是只隐藏，而不会再显示！这里show不再指定显示动画时长，则show方法不再是一个动画。由此可知，dequeue只能使得动画队列中的后续方法执行下去，不能使非动画队列中的jquery方法继续执行！

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