我正在使用jQuery AJAX Form插件在不刷新页面的情况下上传图片。如果我使用标签显示上传的图片(将src设置为上传的图片路径), 那么一切正常。但是,我无法将该上传的图片绘制在画布元素上。实际上,我并不知道问题出在哪里。
if (isset($_FILES["image"]["name"]) && !empty($_FILES["image"]["name"])) {
$filename = $_FILES["image"]["name"];
$tmpname = $_FILES["image"]["tmp_name"];
$location = "uploads/";
move_uploaded_file($tmpname, $location.$filename);
echo $location.$filename;
} else {}
var canvas = document.getElementById("canv");
var contex = canvas.getContext("2d");
var img = new Image();
img.src = responseText;
img.onload = function(){ contex.putImageData(img, 0, 0); }
以下是我的回调函数(内部),当Ajax进程完成时我调用它。感谢任何有帮助的答案。
更新:完整代码
<html>
<head>
<script src="jq171.js"></script> <!--jQuery-->
<script src="jqform.js"></script> <!--jQuery ajax Form plugin-->
<script>
$(document).ready(function(){
$("#myform").ajaxForm(function({success: updateSrc}){
});
});
function updateSrc(responseText){
var canvas = document.getElementById("canv");
var contex = canvas.getContext("2d");
var img = new Image();
img.src = responseText;
img.onload = function(){ contex.drawImage(img, 0, 0); }
}
</script>
</head>
<body>
<form id="myform" action="this.php" method="post" enctype="multipart/form-data" >
<canvas id="canv" width="400px" height="400px"></canvas>
<input type="file" name="image"/>
<input type="submit"/>
</form>
</body>
</html>