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Easy JavaScript FileReader Code

The JavaScript FileReader object allows web pages to read the contents of files stored on the user's computer. Files stored on the user's computer may be selected from a FileList object returned as a result of the user selecting files using the input element:

<input type="file" id="input" onchange="loadFile(event)">

Files may also be selected with a drag and drop operation. The <img id="output"> element allows the FileReader to accept files via drag-n-drop and displays the selected file name.

<script>
function loadFile(event)
{
   var input = event.target;
   var reader = new FileReader();

   reader.onload = function()
   {
      var text = reader.result;
      document.getElementById("showFile").innerText = reader.result;
   }
   reader.readAsText(input.files[0]);
}
</script>

<div id="showFile" style="width:300px; height:200px; margin:8px; border-style:solid;"></div>

<input type="file" accept="text/plain" onchange="loadFile(event)"><img id="output">

The .readAsText() method reads the contents of the specified file. When finished, the result attribute contains the contents of the file as a text string. You need to provide an onload callback function that specifies what should happen when the file read is complete.

More Java Script Code:
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• Java Script Code for a Random Circle Generator
• Password Protection Using the JavaScript Cookie Method
• Java Script Random Password Generator
• Easy HTML5 Drag and Drop
• Regular Expressions Boundaries
• Put Commas in Your Java Script Calculators
• Easy Graph Generating Code
• Synchronous and Asynchronous Script Loading
• Learn JavaScript Visually

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