Utilize ng-change directive within an AngularJS loop

I am facing a particular issue with my Angular JS directive that is designed to verify whether an input is a number or not. If the input is not a number, then it needs to be corrected. Here is the code for my directive:

app.directive('numberValidate', function(){
    return {
        require: 'ngModel',
        link: function($scope, element, attr, modelCtrl){

            modelCtrl.$parsers.push(function (inputValue){

                var transformedInput = parseInt(inputValue); 

                if (transformedInput!=inputValue) {
                   modelCtrl.$setViewValue(transformedInput);
                   modelCtrl.$render();
                }
                return transformedInput;                
            });
        }
    };
});

In addition, I also need to detect when the user stops typing in order to send a request. To achieve this, I have included

ng-model-options="{debounce: 750}"
in the field as shown in the following code:

<input type="text" ng-change="sendChecker()" ng-model="identification" ng-model-options="{debounce: 750}" number-validate>

The sendChecker function triggers the request to the server. Everything works fine when I enter a number like 12345 or a combination of numbers and characters like 12345a, as it gets converted to a number and displayed in the input field. However, the problem arises when I enter a letter a, which creates a loop. How can I prevent this from happening?

I would greatly appreciate any advice on resolving this issue.

Answer №1

Have you considered using ng-pattern for input validation?

<input type="text" ng-pattern=/^[0-9]+$/ ng-model="identification" ng-model-options="{debounce: 750}">

Alternatively, you can utilize input type number

<input type="number" ng-model="identification" ng-model-options="{debounce: 750}">

This way, manual validation may no longer be necessary.

Update:

In the code snippet below, sendChecker() will only execute if a valid value is provided by the user

<form name="myform">
     <input type="number" name="myinput" ng-changed="myform.myinput.$valid ? sendChecker(identification) : " ng-model="identification" ng-model-options="{debounce: 750}">
</form>

Answer №2

When using parseInt('12345a') == 12345, it can cause a loop to occur. To avoid this, it is necessary to remove any non-digit characters from the string.

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