CODEWITHSUNDEEP
javascriptphpajax
user2961968
user2961968

Reputation: 1

Unclear of posting data with Ajax

I'm learning to program and I have come along this tutorial:

http://www.w3resource.com/ajax/working-with-PHP-and-MySQL.php

there is one thing that is unclear to me. In this example there is a assignment: 

var data = "book_name=" + book;

data is sent to php file and it is retrieved with statment

 $book_name = $_POST['book_name'];

Does = sign in assignment means some kind of reference here? So in php we retrieve book_name which in turns refers to book string object?

Am i getting this or am i shooting at fence?

Thans for any answer

Upvotes: 0

Views: 50

Answers (3)

Félix Adriyel Gagnon-Grenier
Félix Adriyel Gagnon-Grenier

Reputation: 8885

the = sign is a assignment operator

it gives to the operand on the left the value of the operand on the right. nothing more, nothing less.

In your example, you data variable is probably passed to a post request, resolving in it containing the book, but as mentionned on your question, they could be named differently and it would make no difference.

Upvotes: 0

brunoramonalmeida
brunoramonalmeida

Reputation: 96

It's the same as you retrieve POST fields. In the "send" method you should pass the arguments in a form "arg=value". For instance, if you want to send two fields you should do:

xhr.send("arg1=value1&arg2=value2")

when retrieve like that

$_POST["arg1"] it will return "value1" $_POST["arg2"] it will return "value2"

For further information read this article!

Upvotes: 1

deweyredman
deweyredman

Reputation: 1450

The = sign in the assignment here is just a way of linking the attribute to the value...so let's say book was "Robinson Crusoe"

you'd pass "book_name=Robinson Crusoe" via POST , and when you retrieve it with $book_name = $POST['book_name']; , book name becomes "Robinson Crusoe". Does this help at all?

Upvotes: 1

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