Coloring in Charts.js based on values

Question

Coloring in Charts.js based on values

Exploring the options for Charts.js to dynamically change fill color based on positive or negative point values has intrigued me.

I am in the process of creating an accounting system for a friend's new company, and I need a chart that visually represents the financial status. If the earnings dip below zero, it should be displayed in red, while any positive numbers should be shown in green.

Is it feasible with Charts.js to alter the chart fill color depending on its position relative to the x-axis?

For reference, here is a link to a photoshopped image illustrating the desired outcome: https://i.sstatic.net/o7SJJ.jpg

javascript charts

Answer 1

Answer №1

It is completely feasible to achieve this.

To implement this functionality, you need to analyze the data upon its return from the server call. Check if the value is less than 0, then include Red in the Array; otherwise, add Green.

You can use the following code snippet for reference:

const backgroundColours = [];

for (let i = 0; i < result.length; i++) {
            if (result[i].valueName < 0) {
                backgroundColours.push(red());  
        } else {
        backgroundColours.push(green());
        }
 }


const red= function() {
    return 'rgb(255,0,0)';
};

const green = function() {
    return 'rgb(0,255,0)';
};

Subsequently, within your chart definition, incorporate something like the following:

data: {
                labels: .....,
                datasets: [
                    {
                        backgroundColor: backgroundColours,
                        data: ....,
                    },
                    ],
            }, ....

Answer 2

It is completely feasible to achieve this.

To implement this functionality, you need to analyze the data upon its return from the server call. Check if the value is less than 0, then include Red in the Array; otherwise, add Green.

You can use the following code snippet for reference:

const backgroundColours = [];

for (let i = 0; i < result.length; i++) {
            if (result[i].valueName < 0) {
                backgroundColours.push(red());  
        } else {
        backgroundColours.push(green());
        }
 }


const red= function() {
    return 'rgb(255,0,0)';
};

const green = function() {
    return 'rgb(0,255,0)';
};

Subsequently, within your chart definition, incorporate something like the following:

data: {
                labels: .....,
                datasets: [
                    {
                        backgroundColor: backgroundColours,
                        data: ....,
                    },
                    ],
            }, ....

Coloring in Charts.js based on values

Answer №1

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