ts-mind/src/util/file.ts

A web-mind lib write in typescript.Sound apis and friendly plug-in mechanism in this lib.

import { $doc } from "./tools";

export const file = {
  read(file_data: File, fn_callback: ITSMAnyCall) {
    const reader = new FileReader();
    reader.onload = function() {
      if (typeof fn_callback === "function") {
        fn_callback(this.result, file_data.name);
      }
    };
    reader.readAsText(file_data);
  },

  save(file_data: File, type: string, name: string) {
    let blob;
    const _wind = window as any;
    if (typeof _wind.Blob === "function") {
      blob = new Blob([file_data], { type });
    } else {
      const BlobBuilder = _wind.BlobBuilder || _wind.MozBlobBuilder || _wind.WebKitBlobBuilder || _wind.MSBlobBuilder;
      const bb = new BlobBuilder();
      bb.append(file_data);
      blob = bb.getBlob(type);
    }
    if (navigator.msSaveBlob) {
      navigator.msSaveBlob(blob, name);
    } else {
      const URL = _wind.URL || _wind.webkitURL;
      const bloburl = URL.createObjectURL(blob);
      const anchor = $doc.createElement("a");
      if ("download" in anchor) {
        anchor.style.visibility = "hidden";
        anchor.href = bloburl;
        anchor.download = name;
        $doc.body.appendChild(anchor);
        const evt = $doc.createEvent("MouseEvents");
        evt.initEvent("click", true, true);
        anchor.dispatchEvent(evt);
        $doc.body.removeChild(anchor);
      } else {
        location.href = bloburl;
      }
    }
  }
};