Implement ng-model on an input field that is pre-filled with a value from a different model within the Angular

One challenge I am facing involves pre-populating an input field with user information, such as their email address or first name, if that data is available.

Initially, I set the value of the input field using $scope.userData. However, when I add an ng-model attribute to the input field, the value on the front-end appears blank.

For example:

Works as expected (input field displays user's email):

<input class="text-input" type="email" value="{{data.email}}">

Does not work (input field remains blank):

<input class="text-input" type="email" ng-model="formData.email" value="{{data.email}}">

I understand why this doesn't work—the formData.email is empty and the model overwrites the value. However, I need to save this information in formData to later submit a POST request to my service upon form submission.

As a newcomer to Angular, I want to avoid relying on jQuery and solve this issue through Angular itself.

So, how can I set the email field to a model for form submission while also populating the initial email data, if available?

javascriptangularjsforms

Answer №1

To properly execute the desired action when the form is loaded, you can use the following code:

formData.email = data.email

In Angular, you can achieve this by utilizing the ngInit method. Assuming you have a function named initializeEmail that handles setting the email value, you can incorporate it like so within your form element (or any relevant location that has access to formData):

<form ng-init="initializeEmail(data.email)">

When Angular initializes, it will recognize this function and appropriately populate the email field in the formData object.

Answer №2

AngularJS utilizes bidirectional binding.

This means that when you input something with ng-model="formData.email", the scope value will change accordingly and can be accessed in the controller as $scope.formData.email. Conversely, if you modify the value of $scope.formData.email in the controller, it will automatically update the value of the corresponding <input /> in the view.

To establish a default address, simply remove the value attribute from the input and set the initial value of $scope.formData.email in the controller at the outset.

I highly recommend reviewing the official basic tutorial. It provides comprehensive explanations for everything related to AngularJS.

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