angularjs - 如何在输入文本字段中的有效数字之前删除零 - angularjs

Question

我想删除或修剪输入文本字段中第一个或有效数字之前的零。

我有一个文本字段，并限制用户只能输入数字。当我输入值“0145”时，它应该读为“145”。

<div ng-controller="MyCtrl">
    <input type="text" ng-model="number" required="required" numbers-only="numbers-only" />
</div>

JavaScript:

angular.module('myApp', []).directive('numbersOnly', function(){
   return {
     require: 'ngModel',
     link: function(scope, element, attrs, modelCtrl) {
       modelCtrl.$parsers.push(function (inputValue) {
           // this next if is necessary for when using ng-required on your input. 
           // In such cases, when a letter is typed first, this parser will be called
           // again, and the 2nd time, the value will be undefined
           if (inputValue == undefined) return '' 
           var transformedInput = inputValue.replace(/[^0-9]/g, ''); 
           if (transformedInput!=inputValue) {
              modelCtrl.$setViewValue(transformedInput);
              modelCtrl.$render();
           }         

           return transformedInput;         
       });
     }
   };
});

function MyCtrl($scope) {
    $scope.number = ''
}

JSFiddle

Answer 1

将您的正则表达式更改为:

var transformedInput = inputValue.replace(/^[^1-9]*|[^0-9]/g, '');