CanvasRenderingContext2D.scrollPathIntoView() - Web APIs 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The CanvasRenderingContext2D.scrollPathIntoView() method of the Canvas 2D API scrolls the current or given path into view. It is similar to Element.scrollIntoView().

Syntax

void ctx.scrollPathIntoView();
void ctx.scrollPathIntoView(path);

Parameters

path

A Path2D path to use.

Examples

Using the scrollPathIntoView method

This example demonstrates the scrollPathIntoView() method.

HTML

<canvas id="canvas"></canvas>

JavaScript

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');

ctx.beginPath();
ctx.fillRect(10, 10, 30, 30);
ctx.scrollPathIntoView();

Edit the code below to see your changes update live in the canvas:

Playable code

<canvas id="canvas" width="400" height="200" class="playable-canvas">
<input id="button" type="range" min="1" max="12">
</canvas>
<div class="playable-buttons">
  <input id="edit" type="button" value="Edit" />
  <input id="reset" type="button" value="Reset" />
</div>
<textarea id="code" class="playable-code">
ctx.beginPath();
ctx.rect(10, 10, 30, 30);
ctx.scrollPathIntoView();</textarea>

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var textarea = document.getElementById("code");
var reset = document.getElementById("reset");
var edit = document.getElementById("edit");
var code = textarea.value;

function drawCanvas() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  eval(textarea.value);
}

reset.addEventListener("click", function() {
  textarea.value = code;
  drawCanvas();
});

edit.addEventListener("click", function() {
  textarea.focus();
})

textarea.addEventListener("input", drawCanvas);
window.addEventListener("load", drawCanvas);

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• The interface defining this method: CanvasRenderingContext2D
• Element.scrollIntoView()