Attempting to showcase the text within an <a> element on a <canvas> element while ensuring there are no noticeable visual distinctions

Imagine having this snippet of code on a webpage:

elit ac <a href="http://www.ducksanddos/bh.php" id='link'>Hello world!</a> nunc

Now, picture wanting to replace the <a> tag with a <canvas> element that displays the same text and looks identical to the original <a> tag. The resulting code would look like this:

elit ac <a href="http://www.ducksanddos/bh.php" id='link'><canvas width='xxx' height='xxx' /></a> nunc

After some investigation and utilizing jQuery, I came up with this partial solution:

var width   = $('#link').width();
var height  = $('#link').height();

var element = document.getElementById('link');
var content = element.innerHTML;

var fontfamily  = document.defaultView.getComputedStyle(element, null).getPropertyValue('font-family');
var fontsize  = document.defaultView.getComputedStyle(element, null).getPropertyValue('font-size');

// create the canvas element
var canvas      = doc.createElement("canvas");
canvas.width    = width;
canvas.height   = height;


var ctx = canvas.getContext('2d');
ctx.textBaseline = 'bottom';
ctx.font = fontsize+" "+fontfamily;
ctx.fillText(content, 0, 22);

element.innerHTML   = ''; 
element.appendChild(canvas);

However, my issue is that the text appears a bit higher (few pixels) than the surrounding text after adding an extra 22px at ctx.fillText(content, 0, 22); to make it visible. Upon inspection with Firebug, the <canvas> element seems to be the same size as the <a>, but positioned slightly higher.

Finally, all this code runs within a Firefox extension, so there's no need to worry about browser compatibility.

Thanks for your help! Yonatan Ben-Nes

Answer №1

Consider that a rendered canvas resembles an image on the page, thus following layout rules differently (which may cause it to not align perfectly with your text on its own).

To align the resulting image element with your text, CSS may be necessary. You can try adding the following JS at the end of the script above:

canvas.style.verticalAlign="middle";

This approach worked for me when testing your sample (I used my own sample HTML code as well). I also had to adjust the fillText command to:

ctx.fillText("content", 0, 20);

However, this adjustment might have been due to my browser/OS font settings.

Answer №2

Is it possible to simply place the text over the canvas? What is the specific purpose of using the canvas?

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