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glenjamin/file-open.js

Created September 22, 2016 16:06
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  1. glenjamin created this gist Sep 22, 2016.
    15 changes: 15 additions & 0 deletions file-open.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,15 @@
    /**
    * Get a promise for a user-selected File object
    */
    export function chooseLocalFile(): Promise<File> {
    const input = document.createElement("input");
    input.type = "file";
    input.accept = "application/json";
    return new Promise((resolve) => {
    input.addEventListener("change", () => {
    const file = input.files[0];
    resolve(file);
    });
    input.click();
    });
    }