code-boxx/0-JS-READ-FILES.MD

## 0-JS-READ-FILES.MD

      
    Raw
  

              0-JS-READ-FILES.MD
            
          
    JAVASCRIPT READ FILES

https://code-boxx.com/read-files-javascript/
LICENSE

Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

  
## 1-read-txt.html
<!DOCTYPE html>
<html>
  <head>
    <title>Read File</title>
    <script>
    function readFileA () {
      // (A) GET SELECTED FILE
      let selected = document.getElementById("demoPickA").files[0];

      // (B) READ SELECTED FILE
      let reader = new FileReader();
      reader.addEventListener("loadend", () => {
        document.getElementById("demoShowA").innerHTML = reader.result;
      });
      reader.readAsText(selected);
    }
    </script>
  </head>
  <body>
    <input type="file" value="Choose TXT File" id="demoPickA"
           accept="text/plain" onchange="readFileA()">
    <div id="demoShowA"></div>
  </body>
</html>

## 2-read-img.html
<!DOCTYPE html>
<html>
  <head>
    <title>Read File</title>
    <script>
    function readFileB () {
      // (A) GET SELECTED FILE
      let selected = document.getElementById("demoPickB").files[0];

      // (B) READ SELECTED FILE
      let reader = new FileReader();
      reader.addEventListener("load", () => {
        let imgTag = document.getElementById("demoShowB");
        imgTag.src = reader.result;
      });
      reader.readAsDataURL(selected);
    }
    </script>
  </head>
  <body>
    <input type="file" value="Choose Image File" id="demoPickB"
           accept="image/*" onchange="readFileB()">
    <img id="demoShowB">
  </body>
</html>

## 3-read-bin.html
<!DOCTYPE html>
<html>
  <head>
    <title>Read File</title>
    <script>
    function readFileC () {
      // (A) GET SELECTED FILE
      let selected = document.getElementById("demoPickC").files[0];

      // (B) READ SELECTED FILE
      let reader = new FileReader();
      reader.addEventListener("load", () => {
        var bindata = reader.result;
        console.log(bindata);
      });
      reader.readAsBinaryString(selected);
    }
    </script>
  </head>
  <body>
    <input type="file" value="Choose File" id="demoPickC"
           onchange="readFileC()">
  </body>
</html>

## 4-array-buffer.html
<!DOCTYPE html>
<html>
  <head>
    <title>Read File</title>
    <script>
    function readFileD () {
      // (A) GET SELECTED FILE
      let selected = document.getElementById("demoPickD").files[0];

      // (B) READ SELECTED FILE
      let reader = new FileReader();
      reader.addEventListener("load", () => {
        var buffer = reader.result;
        console.log(buffer);
        console.log(buffer.byteLength);
      });
      reader.readAsArrayBuffer(selected);
    }
    </script>
  </head>
  <body>
    <input type="file" value="Choose File" id="demoPickD"
           onchange="readFileD()">
  </body>
</html>

## 5-pick-file.html
<!DOCTYPE html>
<html>
  <head>
    <title>Pick File</title>
    <script>
    async function readFileE () {
      // (A) OPEN FILE PICKER
      [handler] = await window.showOpenFilePicker({
        excludeAcceptAllOption: true,
        types: [{
          description: "Text",
          accept: { "text/plain": [".txt", ".text"] }
        }]
      });

      // (B) GET SELECTED FILE
      let selected = await handler.getFile();

      // (C) READ SELECTED FILE
      let reader = new FileReader();
      reader.addEventListener("loadend", () => {
        document.getElementById("demoShowE").innerHTML = reader.result;
      });
      reader.readAsText(selected);
    }
    </script>
  </head>
  <body>
    <input type="button" value="Choose File" onclick="readFileE()">
    <div id="demoShowE"></div>
  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Read File</title>
	<script>
	function readFileA () {
	// (A) GET SELECTED FILE
	let selected = document.getElementById("demoPickA").files[0];

	// (B) READ SELECTED FILE
	let reader = new FileReader();
	reader.addEventListener("loadend", () => {
	document.getElementById("demoShowA").innerHTML = reader.result;
	});
	reader.readAsText(selected);
	}
	</script>
	</head>
	<body>
	<input type="file" value="Choose TXT File" id="demoPickA"
	accept="text/plain" onchange="readFileA()">
	<div id="demoShowA"></div>
	</body>
	</html>