Updating my chart data using chartJS and its angular-chart wrapper has been quite the challenge for me. When I click a button, new data is added to the chart without any issues.
However, I encountered a problem when trying to update the chart after a scroll event. The function call worked perfectly fine and invoked the same function as before, but strangely, my $scope.valuesData remained unchanged. In an attempt to solve this issue, I included a $scope.$apply() after the function, which ultimately redrawn the entire chart with the correct values.
Here are my questions:
Why does the $scope.chartValues not get updated when I call the AddData function from the controller (compared to when I call it from the DOM)? Could this be related to a data-binding issue?
Is there a way to have a function that updates only a specific scope variable instead of refreshing the entire scope?
Here's a snippet of my code:
HTML:
<ion-scroll zooming="false" direction="x" delegate-handle="scroller" on-scroll="getScrollPosition()" has-bouncing="true" scroll-event-interval="30000">
<div class="chart_wrapper" ng-style="{ 'width': myWidth + '%' }">
<canvas class="chart-bar" chart-data="data2" chart-labels="labels" chart-dataset-override="datasetOverride2" chart-options="options2" ng-click="goToMetrics()" ">
</canvas>
</div>
</ion-scroll>
<button class="button button-small button-calm" ng-click="addValues()">Add Data </button>
JS (controller):
$scope.getScrollPosition = function(){
var pos = $ionicScrollDelegate.$getByHandle('scroller').getScrollPosition().left ;
if (pos == 0 && $scope.flag == -1){
$scope.flag = 0;
//setTimeout($scope.addValues(), 1000);
$scope.addValues();
}
if (pos < 0){
$scope.flag = -1;
}
};
$scope.addValues = function(){
console.log('add');
// Retrieve values
var week = Graph.getData();
var pp = $scope.chartData;
var mm = $scope.labels;
// Add values to the chart and update the chart width
var tmp = Graph.addBegin(pp, mm, week);
$scope.valuesData = tmp.values;
$scope.myWidth = $scope.myWidth + tmp.length * 4 ;
};
Any help or insights would be greatly appreciated.