The problem of genres when I am adding image to canvas (drawImage), when I draw a drawing with the other canvas methods I have no problems.
var ready;
ready = function() {
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var imageObj = new Image();
imageObj.src = 'http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
imageObj.onload = function() {
context.drawImage(imageObj, 69, 50);
};
var pngUrl = canvas.toDataURL();
console.log(pngUrl);
$('#client_avatar').val(pngUrl);
};
before setting source you must define onload otherwise it will not be able to call onload.
$(document).ready(function() {
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var imageObj = new Image();
imageObj.onload = function() {
context.drawImage(imageObj, 69, 50);
};
imageObj.src = 'http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
var pngUrl = canvas.toDataURL();
console.log(pngUrl);
// $('#client_avatar').val(pngUrl);
$("#client_avatar").append("<img src='"+ pngUrl +"'>")
});
Here is working jsbin link
$(document).ready(function() { var canvas = document.getElementById('canvas'); var context = canvas.getContext('2d'); var imageObj = new Image(); imageObj.onload = function() { context.drawImage(imageObj, 0, 0, 200, 200); var pngUrl = canvas.toDataURL(); console.log(pngUrl); $('#client_avatar').attr('src', pngUrl); }; imageObj.crossOrigin = 'anonymous'; //not necessary, if image hosted on same server imageObj.src = 'https://i.imgur.com/Q6aZlme.jpg'; });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <canvas id="canvas" width="200" height="200"></canvas> <img id="client_avatar">
apology for not giving any explanation
ʜᴀᴠᴇ ꜰᴜɴ :)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.