Javascript AngularJs ng-model substr
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/35140504/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
AngularJs ng-model substr
提问by IntoTheDeep
How can I set input value with without first letter of ng-model. I do not want to change model value itself. Just content of input to be without first letter.
如何在没有 ng-model 的首字母的情况下设置输入值。我不想改变模型值本身。只是输入的内容没有首字母。
<input type="text" ng-model="myVal" >
and js
和js
$scope.myVal = 'Hello';
Wanted result: ello
想要的结果：你好
回答by Dave Bush
Assuming you don't want two way data-bindin you can use value instead of ng-model
假设您不想要两种方式的数据绑定，您可以使用 value 而不是 ng-model
<input type="text" value="{{myVal.substr(1)}}" >
If you do want two way databinding, using substr on a model statement doesn't make sense.
如果您确实需要双向数据绑定，则在模型语句上使用 substr 没有意义。
回答by Urielzen
Have 2 models and use ng-change in your input to update the original model as you change your input model.
有 2 个模型并在输入中使用 ng-change 来在更改输入模型时更新原始模型。
angular.module('myApp',[]).filter('myFilter',function(){
return function(input){
input = input.substring(1,input.length);
return input;
};
})
.controller('myController',function($scope,$filter){
$scope.myValObj = "Hello";
$scope.myValObj2 = $filter('myFilter')($scope.myValObj);
$scope.updateOriginal = function(){
$scope.myValObj = $scope.myValObj[0] + $scope.myValObj2;
}
})<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp" ng-controller="myController">
<input type="text" ng-model="myValObj2" ng-change="updateOriginal()"/>
<br>
Original Model: {{myValObj}}
<br>
Model For Input: {{myValObj2}}
</div>