JavaScript blob文件名无链接 [英] JavaScript blob filename without link
问题描述
如果你通过window.location强制下载它,你如何设置一个blob文件的名称?
function newFile (data){
var json = JSON.stringify(data);
var blob = new Blob([json],{type:octet / stream});
var url = window.URL.createObjectURL(blob);
window.location.assign(url);
}
运行上面的代码立即下载一个文件,而不需要像bfefe410那样的页面刷新-8d9c-4883-86c5-d76c50a24a1d。我想将文件名设置为my-download.json。
我知道的唯一方法是把戏由 FileSaver.js 使用:
- 创建一个隐藏的
< a>
标签。 - 设置
href
属性到blob的URL。 - 设置其
下载
属性到文件名。 - 点击
< a>
标签。
这是一个简化的例子( jsfiddle ):
var saveData =(function(){
var a = document.createElement(a);
document.body.appendChild (a);
a.style =display:none;
返回函数(data,fileName){
var json = JSON.stringify(data),
blob =新的Blob([json],{type:octet / stream}),
url = window.URL.createObjectURL(blob);
a.href = url;
a.download = fileName;
a.click();
window.URL.revokeObjectURL(url);
};
}());
var data = {x:42,s:hello,world,d:new Date()},
fileName =my-download.json;
saveData(data,fileName);
我写这个例子只是为了说明这个想法,在生产代码中使用FileSaver.js。 p>
备注
- 旧版浏览器不支持下载属性,因为它是HTML5的一部分。
- 某些文件格式被浏览器视为不安全,下载失败。使用txt扩展名保存JSON文件对我有用。
How do you set the name of a blob file in JavaScript when force downloading it through window.location?
function newFile(data) {
var json = JSON.stringify(data);
var blob = new Blob([json], {type: "octet/stream"});
var url = window.URL.createObjectURL(blob);
window.location.assign(url);
}
Running the above code downloads a file instantly without a page refresh that looks like bfefe410-8d9c-4883-86c5-d76c50a24a1d. I want to set the filename as my-download.json instead.
The only way I'm aware of is the trick used by FileSaver.js:
- Create a hidden
<a>
tag. - Set its
href
attribute to the blob's URL. - Set its
download
attribute to the filename. - Click on the
<a>
tag.
Here is a simplified example (jsfiddle):
var saveData = (function () {
var a = document.createElement("a");
document.body.appendChild(a);
a.style = "display: none";
return function (data, fileName) {
var json = JSON.stringify(data),
blob = new Blob([json], {type: "octet/stream"}),
url = window.URL.createObjectURL(blob);
a.href = url;
a.download = fileName;
a.click();
window.URL.revokeObjectURL(url);
};
}());
var data = { x: 42, s: "hello, world", d: new Date() },
fileName = "my-download.json";
saveData(data, fileName);
I wrote this example just to illustrate the idea, in production code use FileSaver.js instead.
Notes
- Older browsers don't support the "download" attribute, since it's part of HTML5.
- Some file formats are considered insecure by the browser and the download fails. Saving JSON files with txt extension works for me.
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