create file by javascript

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Hi,
I want to create file using javascript
found this link

http://jsfiddle.net/UselessCode/qm5AG/[^][^]
want to use this javascript function
I put it into script table

HTML

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title></title>
        <script>
            (function () {
var textFile = null,
  makeTextFile = function (text) {
    var data = new Blob([text], {type: 'text/plain'});

    // If we are replacing a previously generated file we need to
    // manually revoke the object URL to avoid memory leaks.
    if (textFile !== null) {
      window.URL.revokeObjectURL(textFile);
    }

    textFile = window.URL.createObjectURL(data);

    return textFile;
  };


  var create = document.getElementById('create'),
    textbox = document.getElementById('textbox');

  create.addEventListener('click', function () {
    var link = document.getElementById('downloadlink');
    link.href = makeTextFile(textbox.value);
    link.style.display = 'block';
  }, false);
})();
    </script>
    </head>
    <body>
        <textarea id="textbox">Type something here</textarea> <button id="create" >Create file</button> 
        <a download="info.txt" id="downloadlink" style="display: none">Download</a>
    </body>
</html>

but it's not working download link doesn't appear
any help ?

Posted 15-Apr-15 1:53am

Heba Kamel

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2015-04-15T02:24:00

Problem

If you see the left side panel under "Frameworks and Extensions" section, it says that "No-Library (pure JS)" is used and script will be activated on "onLoad". This thing is automatically handled by jsfiddle website.

But if you run the page in browser and see the console of developer tool, it will point out the below issue...

HTML

TypeError: create is null

create.addEventListener('click', function () {

Solution

So, we just need to call the script on window onload like.

JavaScript

window.onload = function(){
            var textFile = null,

            makeTextFile = function (text) {
                                var data = new Blob([text], {type: 'text/plain'});

                                // If we are replacing a previously generated file we need to
                                // manually revoke the object URL to avoid memory leaks.
                                if (textFile !== null) {
                                  window.URL.revokeObjectURL(textFile);
                                }

                                textFile = window.URL.createObjectURL(data);

                                return textFile;
                            };

            var create = document.getElementById('create'),
            textbox = document.getElementById('textbox');

            create.addEventListener('click', function () {
                                                var link = document.getElementById('downloadlink');
                                                link.href = makeTextFile(textbox.value);
                                                link.style.display = 'block';
                                            }, false);
        };

Demo

[Demo] Generate File in JavaScript[^]