AngularJS动态ng-pattern
利用RegExp
需求：o变量根据a变量的值来变化自己的正则校验！a下拉框选择“数字”时，正则校验o输入框只能输入两位数字;当a下拉框选择“字母”时，正则校验o输入框只能输入两位字母。
<!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">
<div>
控制变量：
<select ng-model="a">
<option value='1'>数字</option>
<option value='2'>字母</option>
</select>
</div>
<div>
被控制正则变量:
<input type="text" ng-model="o" id="o" ng-pattern="pattern0"/>
</div>
<input ng-show="false" ng-model="pattern0">
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
$scope.$watch('a', function (newVal, oldVal) {
if (newVal) {
if (newVal=='1') {
$scope.pattern0 = new RegExp('^\\d{2}$');
} else if (newVal=='2') {
$scope.pattern0 = new RegExp('^[a-z]{2}$');
}
}
});
});
</script>
</body>
</html>
测试效果如下
