Insert data into CSV file using javascript

Question

1.00/5 (3 votes)

See more:

MY C++ APPLICATION is reading data form device.e.g Temperature sensor. Sensor is transmitting update after 1 seconds. But I want to insert the sensor update data only when temperature changed with current timestump into CSV file using java script.For the first time i need to create a new file and afterwords just update the previous file.

Required CSV file
Time                     Temp(C)
12:30:12:325              57
12:30:15:351              56
12:30:17:453              57

What I have tried:

HTML+JS.
----------
<html>
<script type="text/javascript">
function createCSV() {
csvRows = [["label first","details of label 1"],["label sec","details of label 2"],["label 3","details of label 3"],["label 4","details of label 4 and 3"],["label 5","details of label 5"],["label 6","details of label 6"],["label 7","details of label 7"],["label 8","details of label 8"],["label 9","details of label 9"]];

var csvString = csvRows.join("%0A");
var a = document.createElement('a');
a.href = 'data:attachment/csv,' + csvString;
a.target = '_blank';
a.download = 'myFile.csv';
document.body.appendChild(a);
a.click();

}
</script>
<body>
<form action="" method="post">
<input type="button" value="Create" >
</form>
</body>
</html>

Posted 3-Aug-16 2:54am

XamBEE

Updated 4-Aug-16 4:39am

v3

Add a Solution

Comments

ZurdoDev 3-Aug-16 10:17am

What code?

I know of no way to use JavaScript to modify files. You can call into a webservice using JavaScript and have the webservice, written in C#, modify files on the server. That is easy to do.

Mohibur Rashid 3-Aug-16 19:09pm

NodeJS may be :) but WTP?

ZurdoDev 3-Aug-16 21:02pm

NodeJS is still javascript. If you want to modify files on the client side you have to find another way.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

KarstenK · Answer 1 · 2016-08-03T07:12:00

Solution 1

Javascript isnt crafted for writing files. It is a security feature to ensure that browsers dont manipulate any PC.

But when you have a C++ App you already have the full native power. Here is some tutorial for coding file access. In your app you must have some variables or better objects with the last values and if changed you append the data.

Posted 3-Aug-16 7:12am

KarstenK

Comments

XamBEE 4-Aug-16 3:22am

<html>
<script type="text/javascript">
function createCSV() {
csvRows = [["label first","details of label 1"],["label sec","details of label 2"],["label 3","details of label 3"],["label 4","details of label 4 and 3"],["label 5","details of label 5"],["label 6","details of label 6"],["label 7","details of label 7"],["label 8","details of label 8"],["label 9","details of label 9"]];

var csvString = csvRows.join("%0A");
var a = document.createElement('a');
a.href = 'data:attachment/csv,' + csvString;
a.target = '_blank';
a.download = 'myFile.csv';
document.body.appendChild(a);
a.click();

}
</script>
<body>
<form action="" method="post">
<input type="button" value="Create" >
</form>
</body>
</html>

XamBEE 4-Aug-16 3:25am

This is the method of writing text into CSV file.