Is it possible to align a div outside the canvas to the axes using Chart.js?

Question

Is it possible to align a div outside the canvas to the axes using Chart.js?

Chart.js uses a canvas to render its axes. Beneath the canvas, there is a div that holds a control element, such as an input slider.

I am looking to adjust this div by adding a margin or another method so that it aligns itself not with the canvas, but with the axes inside it. This would mean that the width of the slider within the div matches the width of the axes.

Is there a way to achieve this?

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

javascript html css chart.js

Answer 1

Answer №1

Solution For Chart.js Canvas

To enhance the chart.js canvas provided below:
Adjust the y axis width to 50px in this case

    options: {
        scales: {
            y: {
                afterFit: function (scaleInstance) {
                    scaleInstance.width = 50; // sets the width to 50px
                }
            }
        }
    }

Utilize a known value for setting graph width via slider input

const sliderToPercentageWidth = (sliderVal) => {
    return (50 + (containerWidth - 50) * (sliderVal/100) )
};

Maintain containerWidth on window resize with following script

window.addEventListener("resize", (event) => {
    containerWidth = container.offsetWidth;
});

The snippet below encompasses all elements, accessible through (CodePen link):

HTML

<div id="container">
    <div id="graph">
        <canvas id="myChart"></canvas>
    </div>
    <input id="width-selector" type="range" value="50">
    
</div>

CSS

#container{
    background-color: #ff000020;
    width: 80vw;
    height:90vh;
}

#graph{
    height: 70vh;
    width: 40vw;
    background-color: #00ff0020;
}

#width-selector{
    width: calc(100% - 50px);
    margin-left: 50px;
}

JS

const sliderToPercentageWidth = (sliderVal) => {
    return (50 + (containerWidth - 50) * (sliderVal/100) )
};

const rangeInput = document.getElementById("width-selector");
const graph = document.getElementById("graph");
const container = document.getElementById("container");
let containerWidth = container.offsetWidth;

// Match the slider width to graph on first render
const newWidth = sliderToPercentageWidth(rangeInput.value)
graph.style.width = `${newWidth}px`;

window.addEventListener("resize", (event) => {
    containerWidth = container.offsetWidth;
});

rangeInput.oninput = () => {
    const newWidth = sliderToPercentageWidth(rangeInput.value)
    graph.style.width = `${newWidth}px`;
};


// A basic chart
// Option for y axis width set

const ctx = document.getElementById("myChart");

new Chart(ctx, {
    type: "bar",
    data: {
        labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        datasets: [
            {
                label: "# of Votes",
                data: [12, 19, 3, 5, 2, 3],
                borderWidth: 1
            }
        ]
    },
    options: {
        responsive: true,
        maintainAspectRatio: false,
        scales: {
            y: {
                afterFit: function (scaleInstance) {
                    scaleInstance.width = 50; // sets the width to 50px
                }
            }
        }
    }
});

Prior Incorrect Solution

You can monitor slider input changes using JS and update graph CSS styling accordingly.

Here's a basic setup example considering slider value mapping to graph width.

The HTML and CSS are minimalistic, dynamically adjusting the width based on the slider input.

<div class="container">
    <div id="graph"></div>
    <input id="width-selector" type="range" value="50">
</div>

.container{
    background-color: red;
    width: 50vw;
    height:70vh;
}

#graph{
    height: 50vh;
    /* Initialize width according to the input slider */
    width: 50%; 
    background-color:blue;
}

#width-selector{
    width: 100%;
}

const rangeInput = document.getElementById("width-selector");

const graph = document.getElementById("graph")

rangeInput.oninput = () => {
    graph.style.width = `${rangeInput.value}%`
}

If your code structure differs from this example, feel free to share for specific guidance.

Answer 2

Solution For Chart.js Canvas

To enhance the chart.js canvas provided below:
Adjust the y axis width to 50px in this case

    options: {
        scales: {
            y: {
                afterFit: function (scaleInstance) {
                    scaleInstance.width = 50; // sets the width to 50px
                }
            }
        }
    }

Utilize a known value for setting graph width via slider input

const sliderToPercentageWidth = (sliderVal) => {
    return (50 + (containerWidth - 50) * (sliderVal/100) )
};

Maintain containerWidth on window resize with following script

window.addEventListener("resize", (event) => {
    containerWidth = container.offsetWidth;
});

The snippet below encompasses all elements, accessible through (CodePen link):

HTML

<div id="container">
    <div id="graph">
        <canvas id="myChart"></canvas>
    </div>
    <input id="width-selector" type="range" value="50">
    
</div>

CSS

#container{
    background-color: #ff000020;
    width: 80vw;
    height:90vh;
}

#graph{
    height: 70vh;
    width: 40vw;
    background-color: #00ff0020;
}

#width-selector{
    width: calc(100% - 50px);
    margin-left: 50px;
}

JS

const sliderToPercentageWidth = (sliderVal) => {
    return (50 + (containerWidth - 50) * (sliderVal/100) )
};

const rangeInput = document.getElementById("width-selector");
const graph = document.getElementById("graph");
const container = document.getElementById("container");
let containerWidth = container.offsetWidth;

// Match the slider width to graph on first render
const newWidth = sliderToPercentageWidth(rangeInput.value)
graph.style.width = `${newWidth}px`;

window.addEventListener("resize", (event) => {
    containerWidth = container.offsetWidth;
});

rangeInput.oninput = () => {
    const newWidth = sliderToPercentageWidth(rangeInput.value)
    graph.style.width = `${newWidth}px`;
};


// A basic chart
// Option for y axis width set

const ctx = document.getElementById("myChart");

new Chart(ctx, {
    type: "bar",
    data: {
        labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
        datasets: [
            {
                label: "# of Votes",
                data: [12, 19, 3, 5, 2, 3],
                borderWidth: 1
            }
        ]
    },
    options: {
        responsive: true,
        maintainAspectRatio: false,
        scales: {
            y: {
                afterFit: function (scaleInstance) {
                    scaleInstance.width = 50; // sets the width to 50px
                }
            }
        }
    }
});

Prior Incorrect Solution

You can monitor slider input changes using JS and update graph CSS styling accordingly.

Here's a basic setup example considering slider value mapping to graph width.

The HTML and CSS are minimalistic, dynamically adjusting the width based on the slider input.

<div class="container">
    <div id="graph"></div>
    <input id="width-selector" type="range" value="50">
</div>

.container{
    background-color: red;
    width: 50vw;
    height:70vh;
}

#graph{
    height: 50vh;
    /* Initialize width according to the input slider */
    width: 50%; 
    background-color:blue;
}

#width-selector{
    width: 100%;
}

const rangeInput = document.getElementById("width-selector");

const graph = document.getElementById("graph")

rangeInput.oninput = () => {
    graph.style.width = `${rangeInput.value}%`
}

If your code structure differs from this example, feel free to share for specific guidance.

Is it possible to align a div outside the canvas to the axes using Chart.js?

Answer №1

Solution For Chart.js Canvas

HTML

CSS

JS

Prior Incorrect Solution

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