我正在为此工作6个小时,我无法弄清楚。未被捕获的DOMException:未能在'FileReader'上执行'readAsDataURL':该对象已经忙于读取Blob。(...)
我想创建一个网站,我在其中选择一个图像文件夹,然后将它们显示在我的文档中。我得到第一张图片,然后在控制台中出现以下错误。
未捕获抛出:DOMException:未能执行“readAsDataURL”上“的FileReader”:对象是已经忙于阅读的斑点(...)
我认为问题是由于引起了我的for循环,因为的FileReader是异步。但我需要循环遍历整个数组,所以我做错了什么?
我加载文件(“将检查以确保我以后只能得到图像”),放入数组中,然后每次读取一个文件。 在将我的代码分解为函数之前,我在一个函数中做了所有事情,并且它可以工作!我包含HTML +原始和当前的JS代码。 感谢您花时间看到这一点。
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Tiled Image Viewer</title>
<script src="js/tiv.js"></script>
<link rel="stylesheet" href="style.css">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div id="main-wrap">
<form name="uploadForm">
<input id="images" type="file" webkitdirectory mozdirectory directory name="myFiles"
onchange="readAndShowFiles();" multiple/>
<span id="list"></span>
</form>
</div>
</body>
</html>
的Javascript原文:
function readAndShowFiles() {
var files = document.getElementById("images").files;
for (var i = 0; i < files.length; i++) {
var file = files[i];
// Have to check that this is an image though
// using the file.name TODO
var reader = new FileReader();
// Closure to capture the file information.
reader.onload = (function(file) {
return function(e) {
// Render thumbnail.
var span = document.createElement('span');
span.innerHTML = ['<img src="', e.target.result,
'" title="', escape(file.name), '">'].join('');
document.getElementById('list').insertBefore(span, null);
};
})(file);
// Read in the image file as a data URL.
reader.readAsDataURL(file);
}
}
的Javascript电流:
function readAndShowFiles() {
console.log("Checkpoint2"); //test
var tiv = new tivAPI();
var array = tiv.getLoadedImages();
tiv.showLoadedImages(array);
}
function tivAPI(){
var imagesarray = new Array();
return{
loadImages: function(){
console.log("Loading Files"); //test
var files = document.getElementById("images").files;
for (var i = 0; i < files.length; i++) {
var file = files[i];
// Have to check that this is an image though
// using the file.name TODO
}
console.log(files.length); //test
return files;
},
getLoadedImages: function(){
imagesarray = this.loadImages();
console.log("Returning Files"); //test
console.log(imagesarray.length);
return imagesarray;
},
showLoadedImages: function(elem){
console.log("Showing Files"); //test
var files = elem;
var reader = new FileReader();
// Closure to capture the file information.
for (var i = 0; i < files.length; i++) {
var file = files[i];
reader.onload = (function(file) {
return function(e) {
// Render thumbnail.
var span = document.createElement('span');
span.innerHTML = ['<img src="', e.target.result,
'" title="', escape(file.name), '">'].join('');
document.getElementById('list').insertBefore(span, null);
};
})(file);
// Read in the image file as a data URL.
reader.readAsDataURL(file);
}
}
};
}