Tips for showing numbers in 2 decimal places while still storing them in 4 decimal places within Angular

Question

Tips for showing numbers in 2 decimal places while still storing them in 4 decimal places within Angular

I am currently involved in a project that requires precise number calculations, as well as a visually appealing display of these numbers to the users.

Below is the HTML code snippet:

<span> {{ getTotalStocksValue() }} %</span>
    <button data-ng-click="redistribute()">Redistribute</button>
    <form action="">
        <input type="text" data-numeric-input-directive   data-ng-repeat="stock in stocks" data-ng-model="stock.value">
    </form>

We showcase various stocks with their values, allowing manual changes to each stock's value. The total value of all stocks is displayed in the span using the getTotalStocksValue() function. The "Redistribute" button distributes the stock values so that the total value equals 100%.

The task at hand is to show the stock values in the inputs rounded to 2 decimal places, while also retaining the values in 4 decimal places for more accurate calculations in the getTotalStocksValue function. For instance, if there are 3 stocks and each has a value of 33.33, the total would be 99.99. However, if a user updates the stock values to 33.3333 each, the total should automatically round up to 100 from 99.9999. I'm unsure if Angular allows for such implementation. My only thought is to display the stock values in the inputs as 4 decimal places and additionally exhibit them in a span or div as 2 decimal places. Any suggestions or recommendations?

javascript angularjs

Answer 1

Answer №1

I believe a directive is necessary to manage the values as copies.

One approach could be creating a custom element

<stock-value value="stock.value"></stock-value>

that gets replaced with the <input> markup above, where a local fixed decimal ng-model is inserted:

<div ng-repeat="stock in stocks">
  <stock-value value="stock.value"></stock-value>
</div>

The directive is defined as follows:

.directive('stockValue', function($compile) {
   return {
     restrict: 'E',
     template: '<input type="text" data-numeric-input-directive>',
     replace: true,
     scope: {
       value: '='
     },
     controller: function($scope) {
       $scope.localModel = undefined
     },
     link: function link(scope, element, attrs) {
       scope.localModel = parseFloat(scope.value || 0).toFixed(2);
       if (!element.attr('ng-model')) {
         element.attr('ng-model', 'localModel');
         $compile(element)(scope);
       }
       scope.$watch('localModel', function(newVal, oldVal) {
         if (!oldVal || newVal === oldVal) return
         scope.value = parseFloat(newVal).toFixed(4);
       })
     }
   }
});

You can view an example on plnkr by following this link: http://plnkr.co/edit/P9uHZwTzgK9mJkRHRrl9?p=preview

This implementation allows users to see a two-decimal fixed value while preserving the original value, but any new input will overwrite the old value with up to four decimals.

Answer 2

I believe a directive is necessary to manage the values as copies.

One approach could be creating a custom element

<stock-value value="stock.value"></stock-value>

that gets replaced with the <input> markup above, where a local fixed decimal ng-model is inserted:

<div ng-repeat="stock in stocks">
  <stock-value value="stock.value"></stock-value>
</div>

The directive is defined as follows:

.directive('stockValue', function($compile) {
   return {
     restrict: 'E',
     template: '<input type="text" data-numeric-input-directive>',
     replace: true,
     scope: {
       value: '='
     },
     controller: function($scope) {
       $scope.localModel = undefined
     },
     link: function link(scope, element, attrs) {
       scope.localModel = parseFloat(scope.value || 0).toFixed(2);
       if (!element.attr('ng-model')) {
         element.attr('ng-model', 'localModel');
         $compile(element)(scope);
       }
       scope.$watch('localModel', function(newVal, oldVal) {
         if (!oldVal || newVal === oldVal) return
         scope.value = parseFloat(newVal).toFixed(4);
       })
     }
   }
});

You can view an example on plnkr by following this link: http://plnkr.co/edit/P9uHZwTzgK9mJkRHRrl9?p=preview

This implementation allows users to see a two-decimal fixed value while preserving the original value, but any new input will overwrite the old value with up to four decimals.

Answer 3

Answer №2

Consider using:

let parsedValue = parseFloat(number).toFixed(4);

This code will round off the value in "number" to 4 decimal places. You can then display "number" in the view using the angular decimal pipe like so:

number | number:'1.2-2'

I hope this solution proves helpful.

Answer 4

Consider using:

let parsedValue = parseFloat(number).toFixed(4);

This code will round off the value in "number" to 4 decimal places. You can then display "number" in the view using the angular decimal pipe like so:

number | number:'1.2-2'

I hope this solution proves helpful.

Answer 5

Answer №3

To easily format numbers in Angular, you can utilize the DecimalPipe provided by the official documentation.

By using yourNumber | number:'1.2-2', you can ensure that the number is displayed with a minimum of one integer digit and always includes two decimal places.

Answer 6

To easily format numbers in Angular, you can utilize the DecimalPipe provided by the official documentation.

By using yourNumber | number:'1.2-2', you can ensure that the number is displayed with a minimum of one integer digit and always includes two decimal places.

Tips for showing numbers in 2 decimal places while still storing them in 4 decimal places within Angular

Answer №1

Answer №2

Answer №3

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