JSFiddle - React, Tailwind, and code Playground

by jiggle

JavaScript

/**
 * Uses canvas.measureText to compute and return the width of the given text of given font in pixels.
 * 
 * @param text The text to be rendered.
 * @param {String} font The css font descriptor that text is to be rendered with (e.g. "14px verdana").
 * 
 * @see http://stackoverflow.com/questions/118241/calculate-text-width-with-javascript/21015393#21015393
 */
function getTextWidth(text, font) {
    // if given, use cached canvas for better performance
    // else, create new canvas
    var canvas = getTextWidth.canvas || (getTextWidth.canvas = document.createElement("canvas"));
    var context = canvas.getContext("2d");
    context.font = font;
    var metrics = context.measureText(text);
    return metrics.width;
};

console.log(getTextWidth("hello there!", "12px menlo"));  // close to 86