Insert casper javascript data to CSV file

问题

I want to pass data from casper JS to CSV file I am currently using

fs = require('fs');
fs.write('test.csv', "name, title", "a");
fs.write('test.csv', name.trim()+","+title.trim(), "a");

this is inside a loop so there are many records

but printing to the CSV file is not inserting to a new row. It currently writes like this and I only want 2 columns on this

Name    Title
name1   name1    name2   title2    name3   title3

回答1:

add linebreaks

fs.write('test.csv', name.trim()+","+title.trim()+"\n", "a");

CSVs vary, but all usually have four special chars,

delimiter (the comma)
escape char (usually \, use to escape the other special chars when used in the data
line delimiter (usually \n, the newline character),
wrapper, (usually quotes that wrap around each value)

So, if you really want a proper CSV you would do something like this.

function escapeCSVData(text){
    text = text.
        replace("\", "\\,"). // escape any escape chars
        replace(",", "\,"); // escape commas
    return '"'+text+'"'; // add quotes
}

fs.write('test.csv', escapeCSVData(name.trim())+","+escapeCSVData(title.trim())+"\n", "a");

I didn't test the above, but that should work for you.

EDIT

I just learned that commas are simply quoted, not escaped, so the function would actaully just look like this..

function escapeCSVData(text){
    return '"'+text+'"'; // add quotes
}

回答2:

Add a line break after each write

fs.write('test.csv', "name, title\n", "a");

edit

Please note that although this solves your new line (row) problem, CSVs are more than just adding commas between entries. If any of your data contains a comma, you will need to escape them.

https://en.wikipedia.org/wiki/Comma-separated_values

There are a few libraries for note, like https://github.com/wdavidw/node-csv#readme -- but if you know absolutely how your data is going to behave, you can go on with your solution.

来源：https://stackoverflow.com/questions/35928005/insert-casper-javascript-data-to-csv-file

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