jquery Cyclic binding Event

Source: Internet
Author: User

<title></title>
<script type= "Text/javascript" src= "Http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" ></ Script>
<body>
<script type= "Text/javascript" >
$ (document). Ready (function () {
var array = [0, 1, 2, 3];

               //1.
               /*
                 for (var index in array) {
                     $ ("#btn" + index). Click (function () {
                         var item  = Array[index];
                         alert (item);
                    });
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&Nbsp;   }*/
                //Always pops 3 because function () {} is not parsed immediately until the call is resolved, at which point the index is already 3.


               //2.
               /*
                 for (var index in array) {
                     $ ( "#btn" + index). Click (function (i) {
                         var item  = array[i];
                         alert (item);
                    } (index));
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;     }*/
                //immediately eject 0, 1, 2, 3 because the function () {} (index) is immediately parsed, and when alert is immediately available, it bounces out.


               //3.
               /*for (var index in Array) {
                     $ ("#btn" + index). Click (function (i) {
                         return function () {
                             var item = Array[i];
                             alert (item);
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;          };
                    } (index));
               }*/
                //execute correctly, click Btn0, Pop 0, click Btn1, Pop-up 1 ...
               //1. Because function (i {} (index) is resolved immediately, so I was sent to 0, 1, 2, 3, in sequence.
                //2. There is no direct alert inside, because do not want to execute immediately, want to click to execute again, so return a function to go out.


               //4.
                for (var index in array) {
                     $ ("#btn" + Index). bind ("click", {Index:index}, ClickHandler);
               }

                function ClickHandler (event) {
                     var index = Event.data.index;
                     var item = Array[index];
                     alert (item);
               }
               //execute correctly, click Btn0, Pop 0, click btn1, Pop 1 ...
               // The event.data is used because the index is persisted to the event.data when it is bound, so we can take it when responding.
            });
       
        </script>

        <input type= "button" id= "Btn0" value= "Btn0"/>
         <input type= "button" id= "Btn1" value= "btn1"/>
         <input type= "button" id= "btn2" value= "btn2"/>
         <input type= "button" id= "Btn3" value= "Btn3"/>&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;
     </body>

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