javascript 如何在 Angular.js 中设置元素的值
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How do I set the value of element in Angular.js
提问by nelsonic
Why can't I do this in Angular.js:
为什么我不能在 Angular.js 中做到这一点：
document.getElementById('divid').value = 'Change Text to This';
And what is the "right" (Angular) way of doing it?
什么是“正确”（Angular）的做法？
回答by ABucin
In Angular you use the ng-modeldirective in order to create a two-way data binding between your model (i.e. a JS variable) and the view (i.e. the <div>). Basically, this means that whenever you change the data in the view (through an input, for instance), the change will be reflected in your JS variable. See below:
在 Angular 中，您使用该ng-model指令来创建模型（即 JS 变量）和视图（即<div>）之间的双向数据绑定。基本上，这意味着每当您更改视图中的数据时（例如，通过输入），更改将反映在您的 JS 变量中。见下文：
HTML:
HTML：
<html ng-app="myApp">
<div ng-controller="MyCtrl">
<div>{{myVariable}}</div>
<input type="text" ng-model="myVariable" />
</div>
</html>
JS:
JS：
/* App global module */
var myApp = angular.module('myApp');
/* Define controller to process data from your view */
myApp.controller('MyCtrl', function($scope) {
$scope.myVariable = "initialValue"; // this is the variable that corresponds to text inserted in your input
});
Here, myVariable will have "initialValue" as an initial value. Any further changes to the input will overwrite the value of this variable.
在这里，myVariable 将具有“initialValue”作为初始值。对输入的任何进一步更改都将覆盖此变量的值。
Also notice that {{myVariable}}injects the variable the data into your div. When you change the value in the input, the div text will be changed as well.
另请注意，{{myVariable}}将数据变量注入到您的 div 中。当您更改输入中的值时，div 文本也将更改。
回答by Stefan
You'd have to bind a controller to your mark up and initialise your Angular app.
您必须将控制器绑定到您的标记并初始化您的 Angular 应用程序。
<div ng-app="myApp">
<div id="divid" ng-controller="valueController">{{value}}</div>
</div>
Then you can simply define a scope variable in your controller
然后你可以简单地在你的控制器中定义一个范围变量
myApp.controller("valueController", function($scope) {
$scope.value = "Hi!";
});
It is considered best to use the ng-app directive in the HTML tag of the page
被认为最好在页面的 HTML 标签中使用 ng-app 指令
