Tested:

Firefox 33+ OK

Chrome 38+ OK

IE 6 -- IE 10 Failed

Thanks to 阮一峰's blog: http://www.ruanyifeng.com/blog/2012/09/xmlhttprequest_level_2.html

The sample shows how to get blob data using javascript XmlHttpRequest by sync.

The w3c tell us cannot set responseType when async is false.

FROM: http://www.w3.org/TR/2012/WD-XMLHttpRequest-20121206/
If async is false, the JavaScript global environment is a document environment, and either the anonymous flag is set, the timeout attribute value is not zero, the withCredentials attribute value is true, or the responseType attribute value is not the empty string, throw an "InvalidAccessError" exception and terminate these steps.

The result is that the type of XMLHttpRequest.response always string, you must change string to blob.
if you not set "charset=x-user-defined", the string is ascii by default. The XMLHttpRequest.response is not correct, some bytes are changed.
I set to utf-8 or utf-16 also for test, but failed.
when using utf-8, the length of XMLHttpRequest.response is not correct
when using utf-16, the length equals to Real-Length/2. the problem is when Real-Length is odd I cannot get the last byte.

<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<div id="aabb"></div>
<script>

var URL = URL || window;

function saveAs(blob, filename) {
var type = blob.type;
var force_saveable_type = 'application/octet-stream';
if (type && type != force_saveable_type) {
var slice = blob.slice || blob.webkitSlice || blob.mozSlice;
blob = slice.call(blob, 0, blob.size, force_saveable_type);
}

var url = URL.createObjectURL(blob);
console.log(url);
var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
save_link.href = url;
save_link.download = filename;
save_link.text = 'ffff';

/*
// in firefox 33+
var m = document.getElementById('aabb');
m.innerHTML = '<a href="' +url+ '">FFF</a>';
*/

// in chrome 38+
var event = document.createEvent('MouseEvents');
event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
save_link.dispatchEvent(event);
URL.revokeObjectURL(url);

}

function binaryToBlob(data) {
var l = data.length, arr = new Uint8Array(l);

for(var i = 0; i < l; i++) {
arr[i] = data.charCodeAt(i);
}

return new Blob([arr], { type: 'image/octet-stream'})
};

(function(){
var r = new XMLHttpRequest();
r.open("GET", 'a.tif', false);
r.overrideMimeType('text/plain; charset=x-user-defined'); // this line is very important ,the charset must be x-user-defined
r.send();

var blob = binaryToBlob(r.response);
blob.fileType = "image/octet-stream";
saveAs(blob, 'res.tif');

})();

</script></body></html>

How to get blob data using javascript XmlHttpRequest by sync的更多相关文章

  1. caffe出错：Unknown bottom blob 'data' (layer 'conv1', bottom index 0)

    原文https://blog.csdn.net/u011070171/article/details/75425740 caffe训练出现如下错误: Unknown bottom blob 'data ...

  2. javascript XMLHttpRequest对象全面剖析

    转载:http://www.jb51.net/article/23175.htm 一. 引言 异步JavaScript与XML(AJAX)是一个专用术语,用于实现在客户端脚本与服务器之间的数据交互过程 ...

  3. [Javascript]XMLHttpRequest对象实现下载进度条

    摘要 可以通过设置一个XMLHttpRequest对象的responseType属性来改变一个从服务器上返回的响应的数据类型.可用的属性值为空字符串 (默认), "arraybuffer&q ...

  4. JavaScript——XMLHttpRequest 家族

    https://www.zhangxinxu.com/wordpress/2013/10/understand-domstring-document-formdata-blob-file-arrayb ...

  5. [JavaScript] XMLHttpRequest记录

    XMLHttpRequest 使用 XMLHttpRequest 对象可以和服务器进行交互,可以获取到数据,而无需让整个页面进行刷新.这样 web 页面可以做到只更新局部页面,降低了对用户操作的影响. ...

  6. [javascript]XMLHttpRequest GET/SET HTTP头与改变HTTP METHOD示例代码

    <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title> ...

  7. directly receive json data from javascript in mvc

    if you send json data to mvc,how can you receive them and parse them more simply? you can do it like ...

  8. Operate blob data in Oracle via C#

    oracle table: CREATE TABLE "SCOTT"."TEST_BLOB"    (    "NAME" VARCHAR2 ...

  9. javascript XMLHttpRequest 对象的open() 方法参数说明

    下文是从w3c上摘录下来的,其中参数 method 说明的很简短,不是很理解,所以又找了些资料作为补充.文中带括号部分. XMLHttpRequest.open() 初始化 HTTP 请求参数 语法o ...

随机推荐

  1. CSS3--选择器

    子元素选择器: div>p{background:yellow:} 相邻的后兄弟选择器(必须相邻) h1+p{padding-top:20px:} 后兄弟选择器(同级的当前元素后面的元素) di ...

  2. 【随笔】内存 & I/O检测相关

    缺页中断 缺页中断属于内部中断,也就是异常.细分的话属于异常中的故障. 在执行一条指令时,如果发现他要访问的页没有在内存中(存在位为0),那么停止该指令的执行,并产生一个页不存在异常,对应的故障处理程 ...

  3. 将asp.net页面弄成伪静态

    在Web.config中写: <RewriterConfig>     <Rules> <RewriterRule>         <LookFor> ...

  4. canvas事件

    canvas的事件只能监听在canvas标签上,而不嗯那个想其他dom元素那样,所以针对canvas里面的图形监听事件是比较麻烦的. 通过isPointInPath(x,y);  这个方法用于判断某一 ...

  5. GATK使用说明-GRCh38（Genome Reference Consortium）（二）

    Reference Genome Components 1. GRCh38 is special because it has alternate contigs that represent pop ...

  6. [Linux技巧]固定Vmware下CentOS的IP

    1. 首先取消使用Vmware动态主机设置服务 [Edit] -> [Virtual Network Editor ...] 打开面板,选中[VMnet8]. 如下,取消对[ Use local ...

  7. HDU2243_考研路茫茫――单词情结

    给出一些词根,问你有多少种长度为L的串包含至少一个词根. 去年就在敲这个题了,今年才敲出来,还是内牛满面之中... 要求包含至少一个的情况,需要求出所有的情况,减去一个都没有的情况就可以了. 对于给出 ...

  8. CAST 类型转换应用

    1: select 2: ID,SystemID,Department, 3: case Number when 0 then '若干' else CAST(Number as varchar)+'人 ...

  9. Count Colour_poj2777(线段树+位)

    POJ 2777 Count Color (线段树)   Count Color Time Limit: 1000MS   Memory Limit: 65536K Total Submissions ...

  10. SQL Server并行死锁案例解析

    并行执行作为提升查询响应时间,提高用户体验的一种有效手段被大家所熟知,感兴趣的朋友可以看我以前的博客SQL Server优化技巧之SQL Server中的"MapReduce", ...