Return true/false to javascript from php file

Question

I'm using $.post method to make ajax calls.
I have a script (php) that checks for user existing in database and returns (echo's) 1 if exist and 0 if not. Is it possible to return true and false so javascript recognize it as boolean ?

One reason for wanting to deal with Boolean true/false in JavaScript as well as PHP can be to maintain conceptual unity. I won't have to think that it's PHP so use true, or it's JavaScript so use 1 and also no conversion required when to and fro. — user216084
– user216084, Commented Jun 9, 2014 at 5:43

David Powers · Accepted Answer · 2011-01-07 14:38:30Z

3

No, the values will always be returned as text. You need to compare the values in your JavaScript.

if (data == '1') {
   //it's true
} else {
   // it's false
}

answered Jan 7, 2011 at 14:38

David Powers

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Comments

Floern · Accepted Answer · 2011-01-07 14:40:44Z

3

Actually the string "0" is interpreted as false by JavaScript and "1" is interpreted as true, so you can simply work with the string value as a boolean. But then you can't use === to compare.

answered Jan 7, 2011 at 14:40

Floern

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please delete me · Accepted Answer · 2011-01-07 14:40:57Z

1

http://api.jquery.com/jQuery.post/

mentions an option to parse data as JSON, so in theory you could use php to echo data in json form.

answered Jan 7, 2011 at 14:40

please delete me

Comments

simon · Accepted Answer · 2011-01-07 14:41:10Z

0

As far as I remember, js takes 0 like a false.

So you can use

if(ans) ...; else ...

I'm not sure, but try it!

answered Jan 7, 2011 at 14:41

simon

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