AngularJS data binding not working - within the controller Scope variables are not showing the entered value

Question

I have a strange situation in which $scope variables binding do not appear to be work as expected.

Here is the HTML:

        <div class="input-group" style="width:100px">
            <input type="number" 
                   class="form-control" 
                   id="Sampling_Request_for_Current_Sampling_INPUT"
                   ng-model="aabbcc" 
                   style="width:125px;text-align:center">
            <span class="input-group-btn">
                <button class="btn btn-default" ng-disabled="Cannot_Allocate_Yet" ng-click="Get_Sampling_Request_Details()" type="button">{{All_Labels.Common.Display}}</button>
            </span>
        </div>

and here is the scope function invoked upon clicking on the button:

$scope.Get_Sampling_Request_Details = function () {
    console.log("$scope.aabbcc: " + $scope.aabbcc) ;
}

The variable $scope.aabbcc is initialized to 0 upon controller's loading.

Regardless what I type into the input element, I always get 0 in the console.

Try passing aabbcc to your function and accessing that parameter in your js file — Rishabh Jain
– Rishabh Jain, Commented May 16, 2017 at 9:17
Thank you @iamalismith for your prompt reply. Unfortunately, company policy does not allow that. The interesting point is that the same page has other inputs connected to scope variables that would OK. This one, however, does not for some reason. — FDavidov
– FDavidov, Commented May 16, 2017 at 9:20
@RishabhJain, that would be a bypass of the issue. variables declared using ng-model SOULD be updated and properly seen within the JS. — FDavidov
– FDavidov, Commented May 16, 2017 at 9:21

anoop · Accepted Answer · 2017-05-16 09:50:23Z

9

This scenario generally happens, If you have wrapped your HTML inside ng-if, ng-switch ng-repeat.. or some other directive that creates new child scope. See this fiddle.

So it's a best practice to wrap your scope in some model to leverage protypical inheritance and correctly bind data to $scope.

Like : $scope.data.aabbcc = 0 and use it like ng-model ='data.aabbcc'.

See this for few minutes and Read this for complete understanding.

edited May 16, 2017 at 9:50

answered May 16, 2017 at 9:31

anoop

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3 Comments

iamalismith Over a year ago

This seems like the most likely explanation to me

FDavidov Over a year ago

BINGO!!!!!!!!!!!!!!!!!!!!!!! Thank you. I would say that AngularJS should have a better "book keeping" mechanism... Still, great library. Thanks again @anoop!!!

anoop Over a year ago

glad to help you :) , See this for few minutes and Read this for complete understanding.

Vikash Kumar · Accepted Answer · 2017-05-16 09:22:16Z

1

check this working example

<div ng-controller="MyCtrl">
Hello, {{name}}!
 <input type="number" ng-model="name"/>
 <button class="btn btn-default" ng-disabled="Cannot_Allocate_Yet" ng-
 click="Get_Sampling_Request_Details()" type="button">test</button>
</div>

var myApp = angular.module('myApp',[]);


 function MyCtrl($scope) {
    $scope.name = 0;
         $scope.Get_Sampling_Request_Details = function () {
console.log("$scope.aabbcc: " + $scope.name) ;
 }
 }

answered May 16, 2017 at 9:22

Vikash Kumar

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1 Comment

FDavidov Over a year ago

... and I have quite many examples in the same project that work smoothly. Thanks anyway.

sofibiju senthil · Accepted Answer · 2017-05-16 09:59:55Z

0

AngularJS controllers control the data. The scope is the binding part between the HTML (view) and the JavaScript (controller). You must define the ng-model inside a ng-controller within which its scope lies. Try this out.

<div ng-controller="myCtrl">
<div class="input-group" style="width:100px">
        <input type="number" 
               class="form-control" 
               id="Sampling_Request_for_Current_Sampling_INPUT"
               ng-model="aabbcc" 
               style="width:125px;text-align:center">
        <span class="input-group-btn">
            <button class="btn btn-default" ng-disabled="Cannot_Allocate_Yet" ng-click="Get_Sampling_Request_Details()" type="button">{{All_Labels.Common.Display}}</button>
        </span>
</div>
</div>
<script>
var app = angular.module('Myapp', []);
app.controller('myCtrl', function($scope) {
    $scope.Get_Sampling_Request_Details = function () {
    console.log("$scope.aabbcc: " + $scope.aabbcc) ;
} 
});
</script>

answered May 16, 2017 at 9:59

sofibiju senthil

12 bronze badges

1 Comment

FDavidov Over a year ago

As stated in one of my comments, there are plenty examples in my project that work perfectly well. Thanks for your answer anyway.

Sa E Chowdary · Accepted Answer · 2017-05-16 10:32:27Z

0

Declare an empty object in your controller section .

eg: $scope.obj = {};

And use like ng-model="obj.key_name" in your html. It will work.

edited May 16, 2017 at 10:32

Sa E Chowdary

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answered May 16, 2017 at 9:35

Keshav Dhawan

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