HTML5 FileReader替代方案 [英] HTML5 FileReader alternative

问题描述

我需要一些HTML5帮助。我有一个脚本循环遍历所有上传的文件，并获取每个文件的详细信息。目前我正在使用包含FileReader的HTML5技术。 FileReader函数只适用于Chrome和Firefox，所以我正在寻找一种可以在所有其他浏览器中使用的替代方法。

I need some help with HTML5. I have a script that loops through all the uploaded files and gets each file details. Currently I am using HTML5 techniques that include FileReader. The FileReader function only works in Chrome and Firefox, so I am looking for an alternative which will work in all of the other browsers.

我看到Stack Overflow问题 Flash替代FileReader HTML 5 API ，但我无法知道如何使用这个Flash，并且没有任何其他解决方案，因此我可以遍历所有上传的文件并获取每个文件的详细信息（这些信息可以在Safari和Internet Explorer中使用）？

I saw the Stack Overflow question Flash alternative for FileReader HTML 5 API, but I wasn't able to figure how to use this Flash thing, and aren't there any other solutions so I can loop through all of the uploaded files and get each file details (which will work in Safari and Internet Explorer)?

推荐答案

完全不使用FileReader，而是通过event.files循环，并通过files [i]和发送一个由XHR与FormData对象的AJAX请求（为我工作，因为我决定我不需要获取文件数据）：

Ended up not using FileReader at all, instead I looped through event.files and got each file by files[i] and sent an AJAX request by XHR with a FormData object (worked for me because I decided I don't need to get the file data):

var xhrPool = {};
var dt = e.dataTransfer;
var files = (e.files || dt.files);
for (var i = 0; i < files.length; i++) {
    var file = files[i];
    // more code...

    xhrPool[i] = getXMLHttpRequest();
    xhrPool[i].upload.onprogress = uploadProgress;
    initXHRRequest(xhrPool[i], i, file);
    data = initFormData(i, file);

    xhrPool[i].send(data);
}

function initFormData(uploaded, file) {
    var data = new FormData();
    data.append(uploaded, file);
    // parameters...

    return data;
}

function uploadProgress() {
    // code..
}

function initXHRRequest(xhr, uploaded, file) {
    // code... onreadystatechange...
    xhr.open("POST", "ajax/upload.php");
    xhr.setRequestHeader("X-File-Name", file.name);
}

function getXMLHttpRequest() 
{
    if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
    }
    else {
        try {
            return new ActiveXObject("MSXML2.XMLHTTP.3.0");
        }
        catch(ex) {
            return null;
        }
    }
}

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