Jquery Post function return value

Question

My first question so here it goes.

My goal is to have a simple form post and if everything checks out proceed.

$.post("anotherpage.php", $("#form").serialize(),function(data){

if(data == 'sent'){
alert("True:  " + data);
}    else{
alert("False:  " + data);
}

$("#somediv").text(data);

     });

here is 'anotherpage.php'

<?php

echo 'sent'; 

?>

Here is my problem, '#somediv' shows the word 'sent' but my function fails every time. Also when it does fail when it alerts it looks like this. "False: s..." It makes me think I have some problem up the stream that is effecting this but I don't know what.

Try console.log(data) with Firebug or Chrome to see what's actually in data. — Skilldrick
– Skilldrick, Commented Jul 26, 2011 at 14:04
You should also ensure that you don't have any whitespace after the word "sent" coming from the server. Try console.log(data.length) and check that it prints "4" — bcoughlan
– bcoughlan, Commented Jul 26, 2011 at 14:07
It is what i am seeing but i believe the entire word is there but it only shows "s...". if i change it to "1234" in return i see "1...". — Brutnus
– Brutnus, Commented Jul 26, 2011 at 14:07
just tried console.log(data) and console.log(data.length) results: sent and 6??? This is the echo string copied. echo 'sent'; — Brutnus
– Brutnus, Commented Jul 26, 2011 at 14:12

James McCormack · Accepted Answer · 2011-07-26 14:48:57Z

1

When trying to be explicit with your HTTP response, it's easy to accidentally return extra whitespace, especially at the end of your PHP block (carriage returns after the closing angle-bracket being the usual suspects).

Some tips:

Make sure there is no whitespace before the start of your php block.
Explicitly end the response with exit() on the last code line of your php block:

e.g.

  <?php

  echo 'sent';
  exit(); 

  ?>

There are a few cool functions in PHP regarding output control. You can buffer the output, clear it, store it or flush it. See here for more information.

edited Jul 26, 2011 at 14:48

answered Jul 26, 2011 at 14:14

James McCormack

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3 Comments

Skilldrick Over a year ago

Also, if you leave the closing ?> tag off then you don't ever have to worry about invisible whitespace after it.

James McCormack Over a year ago

True, but it sends a shiver down my pedantic spine ;) My code soul requires closure!

Daan Wilmer Over a year ago

The Zend coding standard states that, when a file contains only PHP, you should leave the closing tag off. I think it is a cleaner solution than exit().

K6t · Accepted Answer · 2011-07-26 14:14:25Z

0

here is 'anotherpage.php'

<?php

echo "var status='sent';"; 

?>



 $.post("anotherpage.php", $("#form").serialize(),function(data){
alert(date);    
eval(date); // its make as perfect js var string;
    alert(date);
if(status == 'sent'){
    alert("True:  " + status );
    }    else{
    alert("False:  " + status );
    }

    $("#somediv").text(status );

         });

answered Jul 26, 2011 at 14:14

K6t

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2 Comments

K6t Over a year ago

Make sure that u access path is correct??? e.i anotherpage.php or http:\domain\anotherpage.php

Daan Wilmer Over a year ago

First of all: eval is evil. It's better to return JSON, and use jQuery to parse it.

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