Looking to create a rectangular canvas that acts as a progress bar, but struggling with setting the width and height to 100%. It doesn't seem to fill the parent container properly.
Check out this example below:
http://jsfiddle.net/PQS3A/
Is it feasible to create a non-square canvas? I want the canvas dimensions to adjust dynamically based on the screen size, including mobile devices, without hardcoding specific values.
Check out this revised example that addresses the issues:
Your original example had multiple problems:
<div> cannot have height or width attributes directly. These properties should be set using CSS rules.<div> is static, which means it does not act as the positioning parent for its children elements. To make the canvas match the size of the div, you need to change the div's position to relative, absolute, or fixed.width and height attributes on a Canvas element specify the pixel dimensions of the content, not the display size. These values should be integers.The updated example uses CSS to size the div and establish it as a positioned parent element. It includes a JavaScript function (provided below) that adjusts the canvas dimensions to match its display size relative to the parent container.
var canvas = document.querySelector('canvas');
fitToContainer(canvas);
function fitToContainer(canvas){
// Set the visual size to fill the positioned parent
canvas.style.width ='100%';
canvas.style.height='100%';
// Adjust internal size accordingly
canvas.width = canvas.offsetWidth;
canvas.height = canvas.offsetHeight;
}
Ensure that the canvas matches the size of its parent element by utilizing the width and height attributes. This can be achieved using JQuery.
$(document).ready(function() {
var canvas = document.getElementById("theCanvas");
canvas.width = $("#parent").width();
canvas.height = $("#parent").height();
});
If you are unfamiliar with JQuery, an alternative Javascript method is provided:
var canvas = document.getElementById("theCanvas");
var parent = document.getElementById("parent");
canvas.width = parent.offsetWidth;
canvas.height = parent.offsetHeight;
Using the css height and width attributes, such as style="width:100%; height:100%;", will only stretch the canvas and distort any drawings made on it.
Explore the JQuery solution on JSFiddle.
Alternatively, view the Javascript solution on JSFiddle.
Avoid using inline styles and opt for CSS properties within a stylesheet:
<div class="blue-box">
<canvas class="red-background">
</canvas>
</div>
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