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How to use $watchgroup or $watchCollection on 2 variable out of which one is array?


How to use $watchgroup or $watchCollection on 2 variable out of which one is array?

By : vdubya
Date : November 20 2020, 11:01 PM
wish help you to fix your issue If we have 2 variable then we can use $watchCollection or $watchgroup as shown below. , You can still use the same,
code :
 $scope.$watchGroup(['myPlanet', 'otherPlanet'], function(newVals, oldVals, scope) {
    $log.log(newVals, oldVals, scope);
});


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$watchCollection not working on array

$watchCollection not working on array


By : Froten
Date : March 29 2020, 07:55 AM
may help you . You should pass an expression as the first variable to $watchCollection, not an object:
code :
$scope.$watchCollection('Items.Cars', function(newNames, oldNames) {
  $scope.count = $scope.Items.Cars.length;
  console.log($scope.count);
})
$watchCollection on an array of js objects in an Angular Controller requires an anonymous function?

$watchCollection on an array of js objects in an Angular Controller requires an anonymous function?


By : Marc
Date : March 29 2020, 07:55 AM
around this issue Are you looking for self.$watchCollection("Data", ...) instead of self.$watchCollection(self.Data, ...)? Try it out! See the docs to see why: the first argument is a string evaluated on the scope, or a function taking a scope that returns something you want to watch.
$watchGroup vs $watchCollection?

$watchGroup vs $watchCollection?


By : KoenGillissen
Date : March 29 2020, 07:55 AM
may help you . $watchCollection will shallow watch the properties on a single object and notify you if one of them changes.
$watchGroup however watches a group of individual watch expressions.
$watchCollection parameters required returns error, when passed as an array

$watchCollection parameters required returns error, when passed as an array


By : Kevin
Date : March 29 2020, 07:55 AM
should help you out $parse service takes an expression, and turns it into a function, that will resolve to actual data when given a context, which is usually the scope.
code :
  var exp = $parse(attrs.chartData); // exp is an expression function that needs context
  var salesDataToPlot=exp(scope); is the actual result of supplying exp with context - the scope. The result is the array you need
scope.salesDataToPlot = salesDataToPlot;

scope.$watchCollection('salesDataToPlot', function(newVal, oldVal){
               salesDataToPlot=newVal;
               redrawLineChart();
           });
  scope.$watchCollection("salesData", function(newVal, oldVal){
                   salesDataToPlot=newVal;
                   redrawLineChart();
               });
AngularJS watchCollection with scope variables and an array

AngularJS watchCollection with scope variables and an array


By : George Kara
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I'm guessing filterText is populated by an input on your web page. In that case you should use an ng-change attribute in the template (on each input), and this can trigger an event handler on your $scope. As Davin noted in the comments, what you are trying to do is usually a bad idea (except maybe in some rare cases I cannot picture).
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