Tips for adding a click event within a directive in AngularJS

Is there a way to implement a click event in a directive? I have created a bar chart using highcharts.js and I would like to add a click event to it. Can you provide an example of how to do this within our directive?

I see that using jQuery is one option, but I am curious about how we can achieve this using our own directive. Any examples of implementing a click event would be helpful.

http://jsfiddle.net/b4n9z19v/

How can we include a click event in our directive code? Here is the code snippet:

http://plnkr.co/edit/FtDfeyd6fjHL3RNwzyCn?p=preview
.directive('chart', function() {
    return {
        restrict: 'E',
        template: '<div></div>',
        scope: {
            chartData: "=value",
            chartObj: "=?"
        },
        transclude: true,
        replace: true,
        link: function($scope, $element, $attrs) {

            // Update when charts data changes
            $scope.$watch('chartData', function(value) {
                if (!value)
                    return;

                // Initialize the chartData.chart if it doesn't exist yet
                $scope.chartData.chart = $scope.chartData.chart || {};

                // Use default values if nothing is specified in the given settings
                $scope.chartData.chart.renderTo = $scope.chartData.chart.renderTo || $element[0];
                if ($attrs.type)
                    $scope.chartData.chart.type = $scope.chartData.chart.type || $attrs.type;
                if ($attrs.height)
                    $scope.chartData.chart.height = $scope.chartData.chart.height || $attrs.height;
                if ($attrs.width)
                    $scope.chartData.chart.width = $scope.chartData.chart.type || $attrs.width;

                $scope.chartObj = new Highcharts.Chart($scope.chartData);
            });
        }
    };
})

Answer №1

Apologies, I have the solution to your issue. If you are utilizing a library, ensure they offer callbacks or other optional functions in Angular.

If you cannot find any, and come across jQuery, you can implement the same jQuery functionality in Angular by using the corresponding jQuery code.

How can I achieve this in Angular? In Angular, Directives play a key role.

Check out the code below:

HTML

<div directive-name id="container" style="height: 400px"></div>

Directive

    .directive("directiveName", [function () {
        return {
            restrict: "A",
            link: function ($scope, $element, $attributes) {
             var char=$attributes.id;

             $("#"+char).highcharts({
            chart: {
                type: 'column'
            },
            xAxis: {
                categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
            },

            plotOptions: {
                series: {
                    cursor: 'pointer',
                    point: {
                        events: {
                            click: function () {
                                alert('Category: ' + this.category + ', value: ' + this.y);
                            }
                        }
                    }
                }
            },

            series: [{
                data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
            }]
        });
            }
        }
    }]);

Here's a working plunkr for you:

http://plnkr.co/edit/T5dPVVGE0E2LMUMRnDEX?p=preview

Answer №2

When looking at a jQuery example, the function is passed directly like this:

click: function () {
                     alert('Category: ' + this.category + ', value: ' + this.y);
                   }

However, in an Angular example, the function is passed as a JSON string which causes issues with parsing.

"events": {
               "click": "function () {alert('Category: ' + this.category + ', value: ' + this.y)}"
}

To resolve this problem in your Angular example, pass the input directly as you did in the jQuery example. This will ensure that your code works properly.

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