AngularJS:从模型数组中拼接模型元素时，不会更新ng-repeat列表 [英] AngularJS: ng-repeat list is not updated when a model element is spliced from the model array
问题描述
我有两个控制器，并通过app.factory函数在它们之间共享数据.
I have two controllers and share data between them with an app.factory function.
单击链接时，第一个控制器在模型数组(pluginsDisplayed)中添加一个小部件.将该小部件推入数组，并将此更改反映到视图中(该视图使用ng-repeat显示数组内容):
The first controller adds a widget in the model array (pluginsDisplayed) when a link is clicked. The widget is pushed into the array and this change is reflected into the view (that uses ng-repeat to show the array content):
<div ng-repeat="pluginD in pluginsDisplayed">
<div k2plugin pluginname="{{pluginD.name}}" pluginid="{{pluginD.id}}"></div>
</div>
窗口小部件基于k2plugin，remove和resize的三个指令构建. remove指令将范围添加到k2plugin指令的模板.单击所述跨度后，将使用Array.splice()删除共享阵列中的右侧元素.共享阵列已正确更新，但更改未反映在视图中.但是，当添加另一个元素时，在删除之后，视图将正确刷新，并且不会显示先前删除的元素.
The widget is built upon three directives, k2plugin, remove and resize. The remove directive adds a span to the template of the k2plugin directive. When said span is clicked, the right element into the shared array is deleted with Array.splice(). The shared array is correctly updated, but the change is not reflected in the view. However, when another element is added, after the remove, the view is refreshed correctly and the previously-deleted element is not shown.
我怎么了?您能解释一下为什么这行不通吗? 有没有更好的方法可以完成我想对AngularJS进行的操作?
What am I getting wrong? Could you explain me why this doesn't work? Is there a better way to do what I'm trying to do with AngularJS?
这是我的index.html:
This is my index.html:
<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js">
</script>
<script src="main.js"></script>
</head>
<body>
<div ng-app="livePlugins">
<div ng-controller="pluginlistctrl">
<span>Add one of {{pluginList.length}} plugins</span>
<li ng-repeat="plugin in pluginList">
<span><a href="" ng-click="add()">{{plugin.name}}</a></span>
</li>
</div>
<div ng-controller="k2ctrl">
<div ng-repeat="pluginD in pluginsDisplayed">
<div k2plugin pluginname="{{pluginD.name}}" pluginid="{{pluginD.id}}"></div>
</div>
</div>
</div>
</body>
</html>
这是我的main.js:
This is my main.js:
var app = angular.module ("livePlugins",[]);
app.factory('Data', function () {
return {pluginsDisplayed: []};
});
app.controller ("pluginlistctrl", function ($scope, Data) {
$scope.pluginList = [{name: "plugin1"}, {name:"plugin2"}, {name:"plugin3"}];
$scope.add = function () {
console.log ("Called add on", this.plugin.name, this.pluginList);
var newPlugin = {};
newPlugin.id = this.plugin.name + '_' + (new Date()).getTime();
newPlugin.name = this.plugin.name;
Data.pluginsDisplayed.push (newPlugin);
}
})
app.controller ("k2ctrl", function ($scope, Data) {
$scope.pluginsDisplayed = Data.pluginsDisplayed;
$scope.remove = function (element) {
console.log ("Called remove on ", this.pluginid, element);
var len = $scope.pluginsDisplayed.length;
var index = -1;
// Find the element in the array
for (var i = 0; i < len; i += 1) {
if ($scope.pluginsDisplayed[i].id === this.pluginid) {
index = i;
break;
}
}
// Remove the element
if (index !== -1) {
console.log ("removing the element from the array, index: ", index);
$scope.pluginsDisplayed.splice(index,1);
}
}
$scope.resize = function () {
console.log ("Called resize on ", this.pluginid);
}
})
app.directive("k2plugin", function () {
return {
restrict: "A",
scope: true,
link: function (scope, elements, attrs) {
console.log ("creating plugin");
// This won't work immediately. Attribute pluginname will be undefined
// as soon as this is called.
scope.pluginname = "Loading...";
scope.pluginid = attrs.pluginid;
// Observe changes to interpolated attribute
attrs.$observe('pluginname', function(value) {
console.log('pluginname has changed value to ' + value);
scope.pluginname = attrs.pluginname;
});
// Observe changes to interpolated attribute
attrs.$observe('pluginid', function(value) {
console.log('pluginid has changed value to ' + value);
scope.pluginid = attrs.pluginid;
});
},
template: "<div>{{pluginname}} <span resize>_</span> <span remove>X</span>" +
"<div>Plugin DIV</div>" +
"</div>",
replace: true
};
});
app.directive("remove", function () {
return function (scope, element, attrs) {
element.bind ("mousedown", function () {
scope.remove(element);
})
};
});
app.directive("resize", function () {
return function (scope, element, attrs) {
element.bind ("mousedown", function () {
scope.resize(element);
})
};
});
推荐答案
每当您在AngularJS之外进行某种形式的操作时，例如使用jQuery进行Ajax调用，或将事件绑定到像您这样的元素上，就都需要让AngularJS知道自己进行更新.这是您需要执行的代码更改:
Whenever you do some form of operation outside of AngularJS, such as doing an Ajax call with jQuery, or binding an event to an element like you have here you need to let AngularJS know to update itself. Here is the code change you need to do:
app.directive("remove", function () {
return function (scope, element, attrs) {
element.bind ("mousedown", function () {
scope.remove(element);
scope.$apply();
})
};
});
app.directive("resize", function () {
return function (scope, element, attrs) {
element.bind ("mousedown", function () {
scope.resize(element);
scope.$apply();
})
};
});
这里是文档: https://docs.angularjs.org/api/ng/type/$ rootScope.Scope#$ apply
这篇关于AngularJS:从模型数组中拼接模型元素时，不会更新ng-repeat列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
