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AngularJS: API: ng/directive/ngClass

ngClass

  1. - directive in module ng

ngClass指令允许你动态设置HTML元素的CSS类，通过绑定到一个包含要添加的所有类的表达式。

这个指令有三种使用方式，这三种方式取决于表达式计算结果：

  1. 如果表达式结果为字符串，则字符串为使用空格分隔的一个或多个类名。

  2. 如果表达式结果为一个数组，则数组中每个元素为使用空格分隔的一个或多个类名字符串。

  3. 如果表达式结果为一个对象，对象中的每个key-value中如果键值为真时则键名作为类名。

这个指令不会添加重复的类，如果这个类已经存在的话。

当表达式改变时，以前添加的类会被移除，并且只会添加之后新产生的类。

指令信息

  • 这个指令执行优先级为0.

用法

  • 作为属性使用: 
    <ANY
  ng-class="">
...
</ANY>
  • 作为CSS类使用: 
    <ANY class="ng-class: ;"> ... </ANY>

动画

add - 在类被应用到元素前发生

remove - 在类从元素移除前发生

点击这里 了解更多关于涉及动画的步骤。

参数

参数 类型 详述
ngClass expression

用于计算的表达式。 计算结果可以为使用空格分隔的类名字符串、数组，或布尔值的类名映射(map)表。如果是映射表，那些值为真的属性名称将作为css类添加到元素上。

示例

下面演示使用ngClass指令的一些基本绑定用法。

index.html 
<p ng-class="{strike: deleted, bold: important, red: error}">Map Syntax Example</p>
<input Type="checkbox" ng-model="deleted"> deleted (apply "strike" class)<br>
<input Type="checkbox" ng-model="important"> important (apply "bold" class)<br>
<input Type="checkbox" ng-model="error"> error (apply "red" class)<hr>
<p ng-class="style">Using String Syntax</p>
<input Type="text" ng-model="style" placeholder="Type: bold strike red"><hr>
<p ng-class="[style1, style2, style3]">Using Array Syntax</p>
<input ng-model="style1" placeholder="Type: bold, strike or red"><br>
<input ng-model="style2" placeholder="Type: bold, strike or red"><br>
<input ng-model="style3" placeholder="Type: bold, strike or red"><br>
style.css
.strike {
  text-decoration: line-through;}.bold {
    font-weight: bold;}.red {
    color: red;}
protractor.js
var ps = element.all(by.css('p'));

it('should let you toggle the class', Function() {

  expect(ps.first().getAttribute('class')).not.toMatch(/bold/);
  expect(ps.first().getAttribute('class')).not.toMatch(/red/);

  element(by.model('important')).click();
  expect(ps.first().getAttribute('class')).toMatch(/bold/);

  element(by.model('error')).click();
  expect(ps.first().getAttribute('class')).toMatch(/red/);});

it('should let you toggle string example', Function() {
  expect(ps.get(1).getAttribute('class')).toBe('');
  element(by.model('style')).clear();
  element(by.model('style')).sendKeys('red');
  expect(ps.get(1).getAttribute('class')).toBe('red');});

it('array example should have 3 classes', Function() {
  expect(ps.last().getAttribute('class')).toBe('');
  element(by.model('style1')).sendKeys('bold');
  element(by.model('style2')).sendKeys('strike');
  element(by.model('style3')).sendKeys('red');
  expect(ps.last().getAttribute('class')).toBe('bold strike red');});

动画

下面的例子演示使用ngClass来操作动画。

index.html
<input id="setbtn" Type="button" value="set" ng-click="myVar='my-class'">
<input id="clearbtn" Type="button" value="clear" ng-click="myVar=''"><br>
<span class="base-class" ng-class="myVar">Sample Text</span>
style.css
.base-class {
  -webkit-transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) 0.5s;
  transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) 0.5s;}

.base-class.my-class {
  color: red;
  font-size:3em;}
protractor.js
it('should check ng-class', Function() {
  expect(element(by.css('.base-class')).getAttribute('class')).not.
    toMatch(/my-class/);

  element(by.id('setbtn')).click();

  expect(element(by.css('.base-class')).getAttribute('class')).
    toMatch(/my-class/);

  element(by.id('clearbtn')).click();

  expect(element(by.css('.base-class')).getAttribute('class')).not.
    toMatch(/my-class/);});

ngClass 和 已经存在的 CSS3 Transitions/Animations

ngClass指令仍然支持CSS3 Transitions/Animations 事件上，如果它们不遵从ngAnimate CSS 命名结构的话。在动画阶段，ngAnimate将用于辅助CSS类来跟踪动画的开始和结束。但这并不妨碍任何元素上已经存在的CSS转换。要想了解基于类的动画过程中发生了什么，可参见 $animate.addClass 和 $animate.removeClass。


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