[AngularJS] ng-repeat and $index, $event, $log

AngularJS 1.2.x Does Not Allow Duplicate Keys in Repeaters

This lesson was recorded using an older version of AngularJS. With AngularJS 1.2.x, there are some breaking changes that you should be aware of:

<div ng-repeat="value in [4, 4]"></div>

In AngularJS 1.2.x, the above code results in an error. To fix this, you must use the track by syntax:

<div ng-repeat="value in [4, 4] track by $index"></div>

This change causes the repeated items to be tracked by their index instead of their value. Scroll down to view the full corrected code for this lesson.

 

复制代码
<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="utf-8">
  <title>Egghead Videos</title>
  <link rel="stylesheet" href="./foundation.min.css">
  <script type="text/javascript" src="./angular.min.js"></script>
  <script type="text/javascript" src="./app.js"></script>  
</head>
<body>
<div ng-app="app" ng-controller="foo">
    <div class="button"
         ng-repeat="item in 'somewrd'.split('') track by $index"
         ng-click="myFunc($event)">
        {{$index + 1}}. {{item}}
    </div>
</div>
</body>
</html>
复制代码

 

复制代码
var app = angular.module("app", []);

app.run(function($rootScope, $log) {
    $rootScope.$log = $log;
});

app.config(function($logProvider) {
    $logProvider.debugEnabled(false);
});

app.controller("foo", function($scope, $log) {
    $scope.myFunc = function(ev) {
        $log.info(ev);
    }
});
复制代码

 

posted @   Zhentiw  阅读(845)  评论(0)  编辑  收藏  举报
（评论功能已被禁用）
编辑推荐：
· SQL Server 2025 AI相关能力初探
· Linux系列：如何用 C#调用 C方法造成内存泄露
· AI与.NET技术实操系列（二）：开始使用ML.NET
· 记一次.NET内存居高不下排查解决与启示
· 探究高空视频全景AR技术的实现原理
阅读排行：
· 阿里最新开源QwQ-32B，效果媲美deepseek-r1满血版，部署成本又又又降低了！
· Manus重磅发布：全球首款通用AI代理技术深度解析与实战指南
· 开源Multi-agent AI智能体框架aevatar.ai，欢迎大家贡献代码
· 被坑几百块钱后，我竟然真的恢复了删除的微信聊天记录！
· AI技术革命，工作效率10个最佳AI工具
点击右上角即可分享
微信分享提示
AI IDE Trae