AngularJS - ng-model not working with bootstrap directives

Question

I am using AngularJS for my project and I am new to it. But I liked its features and very convenient for development as well. But I came up with the following issue and didn't know to get out of it.

I have a multi view application. The following code is a part of signup view. This view gets displayed when the signup button is pressed. Now the issue is, in the 4th and 5th line below, I have attached a ng-model attribute to and I am able to print the number obtained using {{num}} directive. However, the ng-model num2 below is not getting displayed as above. All I get is the static text {{num2}} being displayed. Why is it not working like the previous case?

<form role='form' action='#/app/register_db' method='post'>
    <h1><small><b>Sign Up Information<b></small></h1>
    <br>
    <input type='text' ng-model='num'>
    <h1>{{num}}</h1>
    <div class='row'>
        <input type='text' ng-model='num2'>
        <h1>{{num2}}</h1>
        <div class='col-xs-5'>
            <input type="text" class='form-control' id="fn" name='firstname' ng-model='ng-firstname' placeholder="First Name">
        </div>
    </div>
...
...

I am new to AngularJS and I am very quickly grasping concepts. So if I am missing something, then please guide me through the right path and help me fix this issue.

I am using angularJS and Bootstrap CSS.

Thanks.

Answer 1

You should get the following error message in your browser's console:

[ngModel:nonassign] Expression 'ng-firstname' is non-assignable. Element: <input type="text" class="form-control" id="fn" name="firstname" ng-model="ng-firstname" placeholder="First Name">

As ng-model="ng-firstname" is not a reference by name, but an expression AngularJS will try to evaluate, so simply not using a dash will fix that. What happens when you break the code there is AngularJS basically stops, and anything else AngularJS would usually do in elements that follow, simply doesn't happen.