Insert data into CSV file using javascript

Question

1.00/5 (3 votes)

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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

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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

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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.

Insert data into CSV file using javascript

1 solution

Solution 1

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Insert data into CSV file using javascript

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