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我已經實現了將圖片上傳到瀏覽器並顯示爲縮略圖的代碼。然後它也可以拖入畫布區域。但是當我用chrome運行它時,它並沒有打開窗口來上傳文件。首先上傳圖片,然後創建縮略圖。但它不適用於Chrome。上傳圖片並在瀏覽器窗口中顯示
這裏是我的代碼,
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Drag Demo</title>
<link href="copy.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="container">
<div style = "border:2px solid black;">
<canvas id = "canvas" style = "position:relative;width:300px;height:300px;top:0px;left:500px; border:2px solid black;" ondrop="dropIt(event);" ondragover="event.preventDefault();"> </canvas>
</div>
<div>
<input type="file" id="fileElem" accept="image/*" style="display:none" >
<div id="fileSelect" class="drop-area">Select some files</div>
</div>
<div id="thumbnail"></div>
</div>
<script type="text/javascript">
function dragIt(event) {
event.dataTransfer.setData("Text", event.target.id)
};
function dropIt(event) {
var theData = event.dataTransfer.getData("Text");
dt = document.getElementById(theData);
event.preventDefault();
var c = document.getElementById("canvas");
var ctx = c.getContext('2d');
ctx.drawImage(dt, 100, 0,dt.width,dt.height);
};
var count = 0;
var fileSelect = document.getElementById("fileSelect"),
fileElem = document.getElementById("fileElem");
fileElem.addEventListener("click",function(e){
var files = this.files
handleFiles(files)
},false)
fileSelect.addEventListener("click", function (e) {
fileElem.click();
e.preventDefault();
}, false);
function handleFiles(files) {
for (var i = 0; i < files.length; i++) {
var file = files[i];
var imageType = /image.*/;
if(!file.type.match(imageType)){
console.log("Not an Image");
continue;
}
var image = document.createElement("img");
var thumbnail = document.getElementById("thumbnail");
image.file = file;
thumbnail.appendChild(image)
var reader = new FileReader()
reader.onload = (function(aImg){
return function(e){
aImg.src = e.target.result;
};
}(image))
image.id = count;
count++;
image.draggable = true;
image.ondragstart = dragIt;
var ret = reader.readAsDataURL(file);
}
}
</script>
</body>
</html>
上面的代碼在Firefox中工作!] – MJQ 2012-07-17 15:59:02
我幫不了你,因爲我在我的手機上,但嘗試調試代碼。在每行之後使用alert()或console.log(),看看哪個部分沒有執行。 – 2012-07-17 16:06:03
我已經試過了!當fileElem.click()執行時,它會進入事件,並在Firefox中打開一個窗口來選擇文件。但在鉻,它遵循相同,但窗口不打開文件選擇! – MJQ 2012-07-17 16:08:50