HTML canvas measureText() Method

Introduction

Check the width of the text, before writing it on the canvas:

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<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="180" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.font = "30px Arial";
var txt = "Hello World"
ctx.fillText("width:" + ctx.measureText(txt).width, 10, 50);
ctx.fillText(txt, 10, 100);//from www .  j ava 2s. c o m
</script>

</body>
</html>

The measureText() method returns an object that contains the width of the specified text in pixels.

Use this method get the width of a text. 

context.measureText(text).width;

Parameter Values

Parameter Description
text The text to be measured



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