Read data from BLOB URL in Javascript

南笙酒味 提交于 2019-12-06 12:34:10

You can use the download attr in anchor element, that force the download and you dont need to reate another blob.

But you need to pay attentio about browser support, see here all the browsers that accept the downloadattr: Can I Use

var blob1 = new Blob(["Hello world!"], { type: "text/plain" });
url = window.URL.createObjectURL(blob1);

var a = document.createElement("a");
document.body.appendChild(a);
a.style = "display: none";
a.href = url;
a.setAttribute("download","Any name");
a.click();
window.URL.revokeObjectURL(url);

And to read the content from a Blob you can use FileReader like this:

var myBlob = new Blob(["Hello"], {type : "text/plain"});
var myReader = new FileReader();
//handler executed once reading(blob content referenced to a variable) from blob is finished. 
myReader.addEventListener("loadend", function(e){
    document.getElementById("text").innerHTML = e.srcElement.result;//prints a string
});
//start the reading process.
myReader.readAsText(myBlob);
<p id="text"></p>
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