The Secret Interaction: Utilizing Hidden Input with AngularJS ng-model Connection

Question

The Secret Interaction: Utilizing Hidden Input with AngularJS ng-model Connection

Is there a way to dynamically calculate the total price of a product using AngularJS when the quantity is added? Here is the code I currently have:

<div ng-app="TheApp">
<div ng-controller="TheController">
    <input type="hidden" name="Price" value="100" ng-model="Price" />
    <input type="text" name="Quantity" ng-model="Quantity" />
    Total Price:{{TotalPrice}}
    <button class="btn btn-primary btn-block" ng-click="click()">Add Items</button>
</div>

In my controller, I have this logic:

$scope.TotalPrice = $scope.Price * $scope.Quantity;

I understand that Angular doesn't support hidden inputs, so I'm seeking advice on the best practices to handle this situation. Additionally, the button is meant for submitting the final result rather than calculating the total price. How can I ensure that the total price updates in real-time?

javascript angularjs

Answer 1

Answer №1

If you simply wish to utilize

<input type="hidden" name="Price" ng-init="Price=100;" ng-value="Price"/>

See it in action: Demo

Answer 2

If you simply wish to utilize

<input type="hidden" name="Price" ng-init="Price=100;" ng-value="Price"/>

See it in action: Demo

Answer 3

Answer №2

Angular doesn't pay attention to hidden input elements (ng-model does not support input fields).

If you want that value in ng-model itself, then it shouldn't be of type hidden. You can resolve this issue by hiding the div using display:none instead of setting it as hidden or using the ng-show directive to hide it.

<div ng-controller="TheController">
    <input type="text" ng-show="false" name="Price" value="100" ng-model="Price" />
    <input type="text" name="Quantity" ng-model="Quantity" />
    Total Price:{{TotalPrice}}
    <button class="btn btn-primary btn-block" ng-click="click()">Add Items</button>
</div>

Answer 4

Angular doesn't pay attention to hidden input elements (ng-model does not support input fields).

If you want that value in ng-model itself, then it shouldn't be of type hidden. You can resolve this issue by hiding the div using display:none instead of setting it as hidden or using the ng-show directive to hide it.

<div ng-controller="TheController">
    <input type="text" ng-show="false" name="Price" value="100" ng-model="Price" />
    <input type="text" name="Quantity" ng-model="Quantity" />
    Total Price:{{TotalPrice}}
    <button class="btn btn-primary btn-block" ng-click="click()">Add Items</button>
</div>

Answer 5

Answer №3

In my opinion, there is no need to include a hidden value in the HTML code. Instead, you can set this value within the controller's scope and update the "TotalPrice" as needed when the user interacts with the quantity. Another option is to utilize ng-init in the HTML, although it is discouraged according to the documentation.

Answer №4

To achieve this without manual clicks:

<input type="hidden" name="Price" value="100" ng-model="Price" ng-change="updateTotalPrice()" />
<input type="text" name="Quantity" ng-model="Quantity" ng-change="updateTotalPrice()" />

Alternatively, if you prefer to trigger the action on click:

<button class="btn btn-primary btn-block" ng-click="addItem()">Add Items</button>

Then, in the addItem function:

function addItem(){
   //increment quantity 
   //call to updateTotalPrice()
}

Answer 8

To achieve this without manual clicks:

<input type="hidden" name="Price" value="100" ng-model="Price" ng-change="updateTotalPrice()" />
<input type="text" name="Quantity" ng-model="Quantity" ng-change="updateTotalPrice()" />

Alternatively, if you prefer to trigger the action on click:

<button class="btn btn-primary btn-block" ng-click="addItem()">Add Items</button>

Then, in the addItem function:

function addItem(){
   //increment quantity 
   //call to updateTotalPrice()
}

Answer 9

Answer №5

To include the Price value within the click function, you can pass it as an argument in this manner:

<div ng-app="TheApp">
<div ng-controller="TheController">

  <input type="text" name="Quantity" ng-model="Quantity" />
  Total Price:{{TotalPrice}}
  <button class="btn btn-primary btn-block" ng-click="click(100)">Add Items</button>
</div>

If your Product information is already stored in a $scope variable, you can directly access it from the controller without needing to pass the Price as hidden or in the click function.

$scope.Product  =  productFactory.get();

$scope.click = function() {
 $scope.TotalPrice = $scope.Product.Price * $scope.Quantity;
}

Answer 10

To include the Price value within the click function, you can pass it as an argument in this manner:

<div ng-app="TheApp">
<div ng-controller="TheController">

  <input type="text" name="Quantity" ng-model="Quantity" />
  Total Price:{{TotalPrice}}
  <button class="btn btn-primary btn-block" ng-click="click(100)">Add Items</button>
</div>

If your Product information is already stored in a $scope variable, you can directly access it from the controller without needing to pass the Price as hidden or in the click function.

$scope.Product  =  productFactory.get();

$scope.click = function() {
 $scope.TotalPrice = $scope.Product.Price * $scope.Quantity;
}

Answer 11

Answer №6

$scope.price = 10;

To retrieve the value from the scope, enclose it in double curly brackets.

<input type="hidden" name="Amount" value="{{price}}"/>

Answer 12

$scope.price = 10;

To retrieve the value from the scope, enclose it in double curly brackets.

<input type="hidden" name="Amount" value="{{price}}"/>

The Secret Interaction: Utilizing Hidden Input with AngularJS ng-model Connection

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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