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テキスト

AngularJS: API: ng/directive/select

select

  1. - directive in module ng

带有angular数据绑定功能的HTMLSELECT元素。

ngOptions

ngOptions属性可用于动态生成元素列表,当对菜单中的一项被选中时,数组元素或对象属性作为被选中的选项绑定到模型的ngModel指令。

注意: ngModel通过引用比较,而非值比较。这在使用对象数组 绑定时很重要。参见示例in this jsfiddle.

此外,设置为空字符串值的单个硬编码的元素可以嵌套到

参数

参数 类型 详述
ngModel string

声明用于数据绑定的Angular表达式。

name
(可选)
string

发布到表单下的控件的属性名称。

required
(可选)
string

控件只有输入值才被认为有效。

ngRequired
(可选)
string

当ngRequired表达式等于true时,添加required属性和required验证约束到元素上。 使用ngRequired替换required,当你想数据绑定到required属性上时。

ngOptions
(可选)
comprehension_expression

下列形式之一:

  • 当数据源为数组:
    • labelforvalueinarray
    • selectaslabelforvalueinarray
    • labelgroupbygroupforvalueinarray
    • selectaslabelgroupbygroupforvalueinarraytrackbytrackexpr
  • 当数据源为对象:
    • labelfor(key,value)inObject
    • selectaslabelfor(key,value)inObject
    • labelgroupbygroupfor(key,value)inObject
    • selectaslabelgroupbygroupfor(key,value)inObject

这里:

  • array/Object:用于进行迭代的结果为一个数组或对象的表达式。
  • value: 局部变量,迭代期间指向array中的每个条目,或Object的每个属性值。
  • key: 局部变量,迭代期间指向Object的属性名称。
  • label: 这个表达式的结果作为元素的标签。表达式通常指向value变量 (如value.propertyName)。
  • select:这个表达式的结果会绑定到父

示例

index.html
ng-controller="ExampleController">
    ng-repeat="color in colors">Name:ng-model="color.name">[hrefng-click="colors.splice($index, 1)">X]
  • [hrefng-click="colors.push({})">add]

Color (null not allowed):ng-model="myColor"ng-options="color.name for color in colors">
Color (null allowed):class="nullable">ng-model="myColor"ng-options="color.name for color in colors">value="">-- choose color --
Color grouped by shade:ng-model="myColor"ng-options="color.name group by color.shade for color in colors">
Selecthrefng-click="myColor = { name:'not in list', shade: 'other' }">bogus.

Currently selected: {{ {selected_color:myColor} }}style="border:solid1pxblack;height:20px"ng-style="{'background-color':myColor.name}">
protractor.js
it('should check ng-options',Function(){expect(element(by.binding('{selected_color:myColor}')).getText()).toMatch('red');element.all(by.model('myColor')).first().click();element.all(by.css('select[ng-model="myColor"] option')).first().click();expect(element(by.binding('{selected_color:myColor}')).getText()).toMatch('black');element(by.css('.nullable select[ng-model="myColor"]')).click();element.all(by.css('.nullable select[ng-model="myColor"] option')).first().click();expect(element(by.binding('{selected_color:myColor}')).getText()).toMatch('null');});
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