angular.js - angularJS ng-repeat
天蓬老师
天蓬老师 2017-05-15 16:54:09
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页面使用了ng-repeat生成了view。在controller里修改了ng-repeat的ng-model。view没有修改是什么么?

$scope.search = function(page){
        $scope.orData.page = page==0?1:page;
        $scope.$watch("orData", function(){
            orderService.searchData($scope.orData).then(function(res){
                $scope.res = res.data;
                if ($scope.res != undefined) {
                    if ($scope.res.page_items.length == 0) {
                        alert("没有订单数据");
                    }else{
                        $scope.tds = $scope.res.page_items;
                        $timeout(function(){
                            console.log($scope.tds);
                        }, 1000);
                    };
                }else{
                    $scope.tds = "";
                    $("#orPaging").empty();
                    alert("订单号不能为非数字");
                };
            });
        });
    };
//
<tbody>
    <tr ng-repeat="td in tds"><!--  -->
        <td>{{td.tid}}</td>
        <td>{{td.created}}</td>
        <td>{{td.buyer_nick}}</td>
        <td>{{td.payment}}</td>
        <td>{{td.shop_name}}</td>
        <td>{{td.title}}</td>
        <td>{{td.seller_memo}}</td>
        <td>{{td.shipping_type}}</td>
        <td>{{td.status}}</td>
        <td>{{td.receiver_name}}</td>
        <td><button type="button" class="btn btn-primary btn-sm" data-tid="{{td.tid}}" ng-click="detail($event)">查看</button></td>
                    </tr>
</tbody>

第一次刷新$scope.tds,view是有改变的。但是再次给$scope.tds赋值,view就不再改变了。
但是如果$scope.tds的长度有变,view又会变了,这是为什么呢?

天蓬老师
天蓬老师

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reply all(2)
習慣沉默

First of all, I want to talk about two naming issues in the code:

  1. "td in td"是什么鬼,Angular居然也可以正确地执行。建议区别这两个名称,比如改成td in tds.
  2. ab这样命名确实可以,不过写控制器时是不是经常要想一想a是什么?哦,是$scope。为何不直接命名为$scope.

Okay, without further ado, let’s answer your questions. When a.td = [], a.td refers to another array, and the original array remains unchanged. The original array is bound in the template. a.td = []的时候,a.td引用了另外一个数组,原有数组并未改变。而模板中绑定的是原有数组。这确实是AngularJS的一个坑,但你最好用pushpopspliceThis is indeed a pitfall of AngularJS

, but you'd better use push, pop, splice, etc. to operate the array, if you want to replace For the entire array, I suggest you do it like this:

javascripta.td.splice(0, a.td.length, {tid:"111", created:"222"}, {tid:"333", created:"444"});

For more detailed data binding mechanism and update process of AngularJS, please refer to this article: http://harttle.github.io/2015/06/06/angular-data-binding-and-digest.ht.. .🎜
習慣沉默
javascript<body ng-app="scopeExample">


<p ng-controller="MyController">
    <p>
      <table>
    <tr ng-repeat="td in tds">
        <td>{{td.tid}}</td>
        <td>{{td.created}}</td>
        <td><button type="button" class="btn btn-primary btn-sm" data-tid="{{td.tid}}" ng-click="detail($event)">查看</button></td>
    </tr>
    </table>
    <button ng-click="change()">button</button>
</p>
</p>


</body>

sdApp.controller('MyController', ['$scope', function($scope) {
    $scope.change = function(){
       $scope.tds = [{tid:"321", created:"456"}, {tid:"abc", created:"def"}];
    };
}]);

Try it out
http://plnkr.co/edit/6tNYE0boiI6CXdKtckpa?p=preview

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