For 循环中的 onClick 事件 [英] onClick event in a For loop

问题描述

我尝试使用 for 创建循环，并通过 onclick 事件递增，但它不起作用.

I've tried to create a loop with a for, and increment by an onclick event, but it doesn't work.

js 的一部分:

 var gameCase = ['', '', '', '', '', '', '', '', ''], // 9
    itemLists = $('game').getElementsByTagName('li'); // 9 items

    for( var i = 0; i < itemLists.length; i++ ) {
         // i already egal to 9
         itemLists[i].onclick = function() {
              // do something
         }
    }

但在本例中，For 循环在我能够单击列表中的元素之前已经完成.

But in this case, the For loop is already finished before I was able to click on an element of the list.

此外，我想获取我单击的项目列表并将其保存在数组中.我尝试了一个 gameCase[this](在 onclick 函数中)，但我不知道这是不是好方法.

Moreover, I would like to get the item list I clicked and save it on a the array. I tried a gameCase[this] (in onclick function), but I don't know if it's the good way.

推荐答案

John Resig 在JavaScript Ninja 的秘密"( http://ejohn.org/apps/learn/#59 )

John Resig covers this topic very well in "Secrets of the JavaScript Ninja" ( http://ejohn.org/apps/learn/#59 )

你需要创建一个临时作用域来保存 i 的值

You'll need to create a temporary scope to preserve i's value

for ( var i = 0; i < itemLists.length; i++ ) (function(i){ 
  itemLists[i].onclick = function() {
      // do something
  }
})(i);

var gameCase = ['', '', '', '', '', '', '', '', ''], // 9
$listParent = $('game').find('ul'), // li's parent
itemLists = $('game').getElementsByTagName('li'); // 9 items

var listHandler = (function() {
  var i = 0;

  return function() {
    // $(this) will in here refer to the clicked li
    i++ // increment i

    if ( i === 9 ) {
      $listParent.off('click', 'li', listHandler); //remove eventhandler when i reaches 9
    }
  }
}());

$listParent.on('click', 'li', listHandler); // attach eventhandler to ul element

这应该可以满足您的需求，因为我在工作，所以现在无法测试.

This should do what you want, cant test it right now since I'm at work.

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