Dealing with transformed data in AngularJS: Best practices

Question

Dealing with transformed data in AngularJS: Best practices

Scenario

I have a dataset structured like:

[{
  xRatio: 0.2,
  yRatio: 0.1,
  value: 15
 }, {
  xRatio: 0.6,
  yRatio: -0.3,
  value: 8
}]

I need to convert this data into absolute values for display in a ng-repeat. However, when I attempt to do so using a converter function within the ng-repeat, Angular gets caught in an infinite loop due to the function returning a new collection each time it is called.

The HTML code snippet is as follows:

<div ng-repeat="result in results">    
  <div>
    <heat-map data="convertResult(result)"></heat-map>
  </div>   
</div>

The heatmap directive is responsible for rendering and displaying the data.

My query is: How can I manage this situation without cluttering the original dataset with the converted values?

Additionally, I would like the capability to remove items from both the converted and original collections.

javascript angularjs

Answer 1

Answer №1

To prevent re-evaluation of the expression, consider using the :: operator within your ng-repeat:
```
<div ng-repeat = "item in ::convert(items)" >
```

Another option is to manually convert the data before passing it to ng-repeat:

JavaScript

$scope.cleanedData = convert( $scope.ratioData );

HTML

<div ng-repeat = "item in cleanedData" >

You can also perform the conversion when necessary. In your heatmap directive, define data as an expression binding with the use of & symbol and then use
```
 scope.data()
```

Answer 2

To prevent re-evaluation of the expression, consider using the :: operator within your ng-repeat:
```
<div ng-repeat = "item in ::convert(items)" >
```

Another option is to manually convert the data before passing it to ng-repeat:

JavaScript

$scope.cleanedData = convert( $scope.ratioData );

HTML

<div ng-repeat = "item in cleanedData" >

You can also perform the conversion when necessary. In your heatmap directive, define data as an expression binding with the use of & symbol and then use
```
 scope.data()
```

Answer 3

Answer №2

Have you thought about utilizing a transformed version of your information with ng-repeat?
Perhaps implementing something similar to this (within your controller):

var transformedData = data.map(function item) {
    return transform(item); 
});
function transform(item) {
  // ... insert your transformation logic here ...
}

Subsequently, you could utilize transformedData in your ng-repeat directive.

Answer 4

Have you thought about utilizing a transformed version of your information with ng-repeat?
Perhaps implementing something similar to this (within your controller):

var transformedData = data.map(function item) {
    return transform(item); 
});
function transform(item) {
  // ... insert your transformation logic here ...
}

Subsequently, you could utilize transformedData in your ng-repeat directive.

Dealing with transformed data in AngularJS: Best practices

Scenario

Answer №1

Answer №2

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