Tips on modifying the width of grid lines for individual lines

Question

Tips on modifying the width of grid lines for individual lines

Looking for assistance in adjusting the line width or color of a specific gridline on a Chartjs chart.

In this scenario, I am aiming to enhance the grid-line width or alter the color of the horizontal gridline at y-axis 60 exclusively. Despite my efforts to find a solution within the Chartjs documentation, my search has been fruitless. It is possible that the current version lacks support for such customization. If that is indeed the case, I would appreciate any help in implementing this particular feature.

Your support is highly valued!

javascript chart.js

Answer 1

Answer №1

If you need to customize the chart, one option is to extend the chart and modify the scale draw function to create a thicker or differently colored line in specific areas.

Take a Look

https://i.sstatic.net/uY4bE.png

Code Snippet

Chart.types.Bar.extend({
    name: "BarAlt",
    initialize: function(data){
        Chart.types.Bar.prototype.initialize.apply(this, arguments);

        var originalScaleDraw = this.scale.draw;
        this.scale.draw = function() {
             originalScaleDraw.apply(this, arguments);
             this.ctx.save();
             this.ctx.beginPath();
             this.ctx.lineWidth = this.gridLineWidth * 5;
             this.ctx.strokeStyle = "rgba(120,120,220,1)";
             this.ctx.moveTo(Math.round(this.xScalePaddingLeft), this.calculateY(60));
             this.ctx.lineTo(this.width, this.calculateY(60));
             this.ctx.stroke();
             this.ctx.closePath();
             this.ctx.restore();
        }
    }
});

After that

...
new Chart(ctx).BarAlt(data);

Try it out - http://jsfiddle.net/udojrq57/

Answer 2

If you need to customize the chart, one option is to extend the chart and modify the scale draw function to create a thicker or differently colored line in specific areas.

Take a Look

https://i.sstatic.net/uY4bE.png

Code Snippet

Chart.types.Bar.extend({
    name: "BarAlt",
    initialize: function(data){
        Chart.types.Bar.prototype.initialize.apply(this, arguments);

        var originalScaleDraw = this.scale.draw;
        this.scale.draw = function() {
             originalScaleDraw.apply(this, arguments);
             this.ctx.save();
             this.ctx.beginPath();
             this.ctx.lineWidth = this.gridLineWidth * 5;
             this.ctx.strokeStyle = "rgba(120,120,220,1)";
             this.ctx.moveTo(Math.round(this.xScalePaddingLeft), this.calculateY(60));
             this.ctx.lineTo(this.width, this.calculateY(60));
             this.ctx.stroke();
             this.ctx.closePath();
             this.ctx.restore();
        }
    }
});

After that

...
new Chart(ctx).BarAlt(data);

Try it out - http://jsfiddle.net/udojrq57/

Tips on modifying the width of grid lines for individual lines

Answer №1

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