reading and writing json file using javascript

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How to read and write into file using JavaScript

can anybody provide sample code to read and write into file using javascript?

at present i am trying to read input from json file and display it in textboxes providing the user flexibility to edit the data. Edited data has to be written into json file.

This post should provide you with the best answer: http://stackoverflow.com/questions/585234/how-to-read-and-write-into-file-using-javascript — Conrad Lotz, Sep 04 '12 at 08:38

Sark · Answer 1 · 2012-09-04T10:58:53.167

here is the sample html file, i have tested it with firefox working fine.

<!DOCTYPE html>
<html>
    <head>
        <script>        
            function handleFileSelect()
            {               
                if (window.File && window.FileReader && window.FileList && window.Blob) {

                } else {
                    alert('The File APIs are not fully supported in this browser.');
                    return;
                }   

                input = document.getElementById('fileinput');
                if (!input) {
                  alert("Um, couldn't find the fileinput element.");
               }
               else if (!input.files) {
                  alert("This browser doesn't seem to support the `files` property of file inputs.");
               }
               else if (!input.files[0]) {
                  alert("Please select a file before clicking 'Load'");               
               }
               else {
                  file = input.files[0];
                  fr = new FileReader();
                  fr.onload = receivedText;
                  fr.readAsText(file);
               }
            }

            function receivedText() {           
               //result = fr.result;
               document.getElementById('editor').appendChild(document.createTextNode(fr.result))
            }           

        </script>
    </head>
    <body>
        <input type="file" id="fileinput"/>
        <input type='button' id='btnLoad' value='Load' onclick='handleFileSelect();'>
        <div id="editor"></div>
    </body>
</html>

This does not show how to write JSON – Zombo Nov 16 '13 at 04:39 — Zombo, Nov 16 '13 at 04:39

score 1 · Answer 2 · answered Sep 04 '12 at 08:33

1

JavaScript running in a web page displayed in a browser cannot access the client file system.

But you can use API's

answered Sep 04 '12 at 08:33

Peru

2,871
5
37
66

is it possible if i deploy the html page in IIS and access the file using url..??if yes can you please provide sample code for the same... – user1631651 Sep 04 '12 at 10:46
@user1631651 see my above answer that's a working sample.. – Sark Sep 04 '12 at 11:00

score 0 · Answer 3 · answered Sep 04 '12 at 08:41

0

(No File programming in javascript) If you mean parsing json in javascript then :-

you can use Douglas crockford JSON lib for parsing:- JSON.parse method Refer Link :- http://www.json.org/js.html

Example,

var abcd= "[{"name" : "sandeep"},{"name" :"Ramesh"}]"

abcd =JSON.parse(abcd);

for (var index=0;index<abcd.length;index++){

alert(abcd[i].name);
}

answered Sep 04 '12 at 08:41

sandeep patel

436
4
16

i am looking for a code which can access a file..either in local filesystem or through url.. please help. – user1631651 Sep 04 '12 at 10:47
Ok then, if your file is in a server then make ajax call through jquery $.post() and in callback do the parsing and then manipulate it . After that send it to server with another ajax call and save it in the desired location in server. – sandeep patel Sep 04 '12 at 10:59

reading and writing json file using javascript

3 Answers3

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