How can I place a MouseOver event on a DiscreteBar Chart bar

Question

I'm trying to create a a bar chart using an NVD3 angular directive from here: http://krispo.github.io/angular-nvd3/#/

The chart I'm using is this one: http://krispo.github.io/angular-nvd3/#/discreteBarChart

This is my html for creating the chart on the page (the context doesn't seem to be important in this scenario):

                    <nvd3 options="options"
                          data="top10bar"
                          ng-mouseenter="mouseEnterEvent($event)"></nvd3>

This is the controller code (within which the tag sits)

app.controller('BarChartController', function ($scope) {

$scope.options = {
    chart: {
        type: 'discreteBarChart',
        height: 350,
        margin: {
            top: 20,
            right: 20,
            bottom: 60,
            left: 55
        },
        width: 500,
        x: function (d) {
            return d.label;
        },
        y: function (d) {
            return d.value;
        },
        showValues: true,
        transitionDuration: 500,
        xAxis: {
            axisLabel: 'X Axis'
        },
        yAxis: {
            axisLabel: 'Y Axis',
            axisLabelDistance: 30
        },
        tooltips: false,
        discretebar: {
            rectClass: ['discreteBar', 'tableRow']
        },
        interactive: true
    }
};

$scope.mouseEnterEvent = function (event) {

    console.log("EVENT!");
    console.log(event);
};

$scope.$on('elementMouseover.tooltip', function (event, data) {
    console.log("In scope.on");
    console.log(event);
    console.log(data);
    console.log("end");
});

$scope.$on('tooltipShow.directive', function (angularEvent, event) {
    angularEvent.targetScope.$parent.event = event;
    angularEvent.targetScope.$parent.$digest();
});

Of the three event handlers you can see at the bottom of the controller, only the first one works because I have an ng-mouseenter option specified in nvd3. However, this works when the mouse enters over the entire chart div. What I want is to detect a mouse over on an individual bar so that I can highlight it and then highlight another part of my view.

How would you go about doing what I'm trying to achieve here? Any help is much appreciated, cheers!

Answer 1

I had the same issue, to detect the event on the bar I have written the following.

$scope.mouseEnterEvent = function (event) {
    if (event.target.localName === 'rect') {
        /// Do your operation here.
    }
};

It worked for me. Hope it will help you, let me know if you find any better way to pass the event to chart itself.