我正在探索AngularJS中的高级功能,例如自定义指令。我希望有一个文本框,通过使用自定义指令,应该只允许数字或文本,具体取决于用户从下拉框中选择的值。我已设法创建一个自定义指令,该指令仅允许基于AngularJs Custom Directive fails the text box validation的数字。我不确定如何动态地将自定义指令应用于同一文本框。我创建了另一个自定义指令,该指令只允许文本,但不确定如何动态地将仅数字指令替换为text only指令。
<body>
<div ng-app="TextboxExample" ng-controller="ExampleController">
<form name="shippingForm" novalidate>
<select id="textBoxOptions" >
<option value="number" selected="selected">Numbers Only</option>
<option value="text">Text Only</option>
<option value="special">Special Characters</option>
<option value="any">Any Value</option>
</select>
<input id="customTextBox" unbindable number-only-input type="text" name="name" ng-model="testvalue.number" required />
<span class="error" ng-show="shippingForm.name.$error.required">
Please enter a value
</span>
</form>
</div>
<script src="scripts/angular.js"></script>
<script src="scripts/jquery.min.js"></script>
<script>
$("select").change(function () {
var selected = $("#textBoxOptions").val();
$('#customTextBox').attr("ng-model", selected);
});
</script>
<script>
angular.module('TextboxExample', [])
.controller('ExampleController', ['$scope', function ($scope) {
$scope.testvalue = { number: 1, validity: true };
}])
.directive('numberOnlyInput', ['$compile', function ($compile) {
return {
link: function (scope, element, attrs) {
var watchMe = attrs["ngModel"];
scope.$watch(watchMe, function (newValue, oldValue) {
if (newValue == undefined || newValue == null || newValue == "") {
return;
} else if (isNaN(newValue)) {
var myVal = watchMe.split(".");
switch (myVal.length) {
case 1:
scope[myVal[0]] = oldValue;
break;
case 2:
scope[myVal[0]][myVal[1]] = oldValue;
}
}
$compile(element)(scope);
});
}
};
}]);
</script>
当我更改下拉框中的值时,它会正确更改customTextBox上的ng-model,并由inspect元素检查。但是,我不确定如何创建和应用多个指令。感谢
答案 0 :(得分:1)
有几种可能性。您可以切换指令atttibute或整个元素:
<input {{ yourmode ? number-directive : text-directive }} ng-model="data">
或
<input ng-show="yourmode" number-directive ng-model="data">
<input ng-show="!yourmode" text-directive ng-model="data">
或者您使用动态指令属性
更改模式<input directive-data="yourmode" my-input-directive ng-model="data">