CODEWITHSUNDEEP
javascriptjquerycsschart.jsradar-chart
Zuri
Zuri

Reputation: 312

Chartjs radar indexed labels

I am using chartjs to draw a radar chart.

The value is shown on hover in the point of the chart, but I would like to show the value always. I need to change the view to show the data when I print the page.

This is my current chart. The label is shown on hover

This is my current chart. The label is shown on hover

I want to show the value always, like in the following image I want to show the value always, like in the following image

Upvotes: 8

Views: 2449

Answers (2)

tektiv
tektiv

Reputation: 14187

The following answer only works for Chart.js v2.
If you want a v1 solution, check pritishvaidya's.

You want to use the animation property of the chart options :

options : {
    animation: {
        duration: 500,
        onComplete: function () {
            // The code here will be executed at the end of the animation 
            // (after 500ms here)

            // You can get the canvas context using the following :
            var ctx = this.chart.ctx;
            // `this` being the chart instance
        }
    }
}

Now you want to add the value of the point above it, which can be done using the data model, which you can find in the dataset properties :

onComplete: function() {
    // You get the canvas context, to help you writing what you want
    var ctx = this.chart.ctx;

    // Here you set the context with what you need (font, size, color ...)
    ctx.font = Chart.helpers.fontString(Chart.defaults.global.defaultFontFamily, 'normal', Chart.defaults.global.defaultFontFamily);
    ctx.textAlign = 'center';
    ctx.fillStyle = 'black';

    // For every dataset ...
    this.data.datasets.forEach(function(dataset) {

        // For every data in the dataset ...
        for (var i = 0; i < dataset.data.length; i++) {

            // We get its model
            var model = dataset._meta[0].data[i]._model;

            // And write the data above it
            ctx.fillText(dataset.data[i], model.x, model.y - 2);
            // You can edit the last two arguments according to what you need
        }
    });
}

Follows the result of the above code, which you can find on this jsFiddle :

enter image description here

Upvotes: 3

Pritish Vaidya
Pritish Vaidya

Reputation: 22189

On the chart js documentation,you can run the functions when the animation completes using onAnimationComplete : function(){}

Fiddle defined

here

Your html file maybe like this

<canvas id="my_chart"></canvas>

Then your js file may look like this

fillColor: "#79D1CF",
            strokeColor: "#79D1CF",
            data: [60, 80, 81, 56, 55, 40]



 var ctx = document.getElementById("myChart1").getContext("2d");
    var myLine = new Chart(ctx).Line(chartData, {
    showTooltips: false,
    onAnimationComplete: function () {
         //Your other ChartJs features defined here



var ctx = this.chart.ctx;
        ctx.font = //your font
        ctx.fillStyle = //your text color
        ctx.textAlign = "center";
        ctx.textBaseline = "bottom";

        this.datasets.forEach(function (dataset) {
            dataset.points.forEach(function (points) {
                ctx.fillText(points.value, points.x, points.y - 10);//You can change the x and y position of the text as per your requirement
            });
        })
    }
});

//Full attribution goes to the author and the thread

Upvotes: 1

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