[英]How to make FileReader Asyncronous without Using FileReaderSync in Javascript?
I am using FileReader for reading multiple files and folders through drag and drop in chrome using javascript.我正在使用 FileReader 通过使用 javascript 在 chrome 中拖放来读取多个文件和文件夹。 It is working properly, but problem is that i want to call function after all file and folder read completes.
它工作正常,但问题是我想在所有文件和文件夹读取完成后调用函数。 I can't because it is asyncronous operation and FileReaderSync is not supported in chrome.
我不能,因为它是异步操作,而且 chrome 不支持 FileReaderSync。 So is there any way to doing this?
那么有没有办法做到这一点?
this is my code,这是我的代码,
entry.file(function (file) {
var reader = new FileReader();
reader.onloadend = function (e) {
data.push(this.result);
};
reader.readAsText(file);
});
As an example of what can be used here.作为此处可以使用的示例。 This is can't be used as "Copy&Paste" variant :
这不能用作“复制和粘贴”变体:
var filesCount = "give here number of files";
var callbackFunction = function(){
if(data.length == filesCount ){
Console.log( "Assume this as the end of all files reading" );
}
}
entry.file(function (file) {
var reader = new FileReader();
reader.onloadend = function (e) {
data.push(this.result);
callbackFunction();
};
reader.readAsText(file);
});
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