一、select相关知识
<select> <option value="0">HTML</option> <option value="1">Java</option> <option value="2">Python</option> </select>
其中,value 是存储到数据库的值,在此处为0,1,2这些数值,label 为显示在页面的值,在此处为Html、Java这些字符。
二、ng-options
1.数组作为数据源
label for value in array select as label for value in array label group by group for value in array代码1(数组中为字符串)
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script src="https://cdn.staticfile.org/angular.js/1.4.6/angular.min.js"></script> </head> <body> <div ng-app="myApp" ng-controller="myCtrl"> <!-- 这里的label和value需一致,否则会报错 表达式语法:label for value in array --> <select ng-model="name" ng-options="name for name in names"></select> </div> <script> var app = angular.module('myApp', []); app.controller('myCtrl', function($scope) { $scope.names = ['baidu', 'Google', 'apple']; }); </script> </body> </html>
最终得到的结果为:
<select ng-model="name" ng-options="name for name in names" class="ng-pristine ng-valid ng-touched"> <option value="?" selected="selected"></option> <option value="string:baidu" label="baidu">baidu</option> <option value="string:Google" label="Google">Google</option> <option value="string:apple" label="apple">apple</option> </select>
需要注意的是,在最后生成的html代码中option的value 值为String:baidu ,会在数组中原有的字符串之前加上其类型的标识,这个通过百度了解到是因为angularjs版本问题造成,具体未测试。
代码2(数组中为一个对象)
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script src="https://cdn.staticfile.org/angular.js/1.4.6/angular.min.js"></script> </head> <body> <div ng-app="myApp" ng-controller="myCtrl"> <!-- 表达式语法:label for value in array --> <select ng-model="name" ng-options="c.id for c in coms"></select> </div> <script> var app = angular.module('myApp', []); app.controller('myCtrl', function($scope) { $scope.coms = [ {'id':'baidu','name':'百度'}, {'id':'Google', 'name':'谷歌'}, {'id':'apple', 'name':'苹果'}]; }); </script> </body> </html>
最终得到的html代码为:
<!-- 注意:此处ng-model绑定的name变量并非选中项的name属性,而是选中项的全部属性 如选中了索引为0项,则name={"id":"baidu","name":"百度"} 这边ng-model绑定变量为值为select的value值 --> <select ng-model="name" ng-options="c.id for c in coms" class="ng-pristine ng-valid ng-touched"> <option value="?" selected="selected"></option> <option value="object:3" label="baidu">baidu</option> <option value="object:4" label="Google">Google</option> <option value="object:5" label="apple">apple</option> </select>