Returning something

Shadowing · March 21, 2012

Hey guys i just started trying out ajax and my knowledge of java script is still really low.

Im trying to test to make sure im even grabing the php file. So i want to return something so i know its working.

so i put this div tag with some words on the file "include_evaluate.php"

<div id="myDiv">
Ajax is working
</div>

So when i click the button with the id evaluate i want it to display "Ajax is working".

so i dont know what i need to add to this to make it return whats in the div.

    <script>
    
     $(document).ready(function(){
   $("#evaluate").click(function(event){
      
     xmlhttp.open("GET","\System_Lords\ajax\include_evaluate.php",true);
     xmlhttp.send();

     document.getElementById("myDiv").innerHTML=xmlhttp.responseText;

   });

    });
   
   </script>

trq · March 21, 2012

You should read this: http://www.phpfreaks.com/forums/index.php?topic=323280.0

Seriously, if your not using a framework you have rocks in your head.

Your code looks like a mix of jQuery and vanilla JavaScript. If you really are using jQuery, take a look at there Ajax functionality.

Shadowing · March 21, 2012

yah im using jquery

I read that post before posting, its just to much code. need something more simplier. i was reading ajax for jquery but couldnt find any tutor examples for it at jquery.com. i'll go look again.

trq · March 21, 2012

A simple example.

foo.php

echo json_encode(array('msg' => 'Hello from foo.php'));

index.html

<!DOCTYPE html>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.js"></script>
    <script>
      $(document).ready(function() {
        $("#linky").click(function() {
          $.ajax({
            url: 'foo.php',
            type: 'POST',
            dataType: json,
            success(response) {
              $('#foo').html(response.msg);
            }
          });
        });
      });
    </script>
  </head>
  <body>
    <a href="#" id="linky">Click</a>
    <div id="foo"></div>
  </body>
</html>

I generally return JSON form ajax as it allows you to easily pass back more than one value.

Plenty more examples in the docs. http://api.jquery.com/jQuery.ajax/

trq · March 21, 2012

I should show an example of sending data to php too I guess.

index.php

<!DOCTYPE html>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/jquery-ui.js"></script>
    <script>
      $(document).ready(function() {
        $("#linky").click(function() {
          $.ajax({
            url: 'foo.php',
            type: 'POST',
            dataType: json,
            data: {
              msg_from_js: 'Hello from jQuery'
            },
            success(response) {
              $('#foo').html(response.msg);
            }
          });
        });
      });
    </script>
  </head>
  <body>
    <a href="#" id="linky">Click</a>
    <div id="foo"></div>
  </body>
</html>

foo.php

// send the message back to js.
echo json_encode(array('msg' => $_POST['msg_from_js']));

Shadowing · March 21, 2012

ahh i totally skiped over .ajax cause of the way jquery.com has their browsing catagory set up.. i clicked on global ajax event handlers instead which isnt at the begining lol. Thanks for the examples thorpe will try it out.

Shadowing · March 21, 2012

I'm getting hit with a script error on just displaying the index page before even clicking on the link. is there something im doing wrong?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN"  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>

<script type="text/javascript" src="/system_lords/jquery/jquery-1.7.1.min.js"></script>

<script>      

$(document).ready(function() {        

$("#linky").click(function() {          

	$.ajax({            

		url: 'foo.php',            

		type: 'POST',            

		dataType: json,            

		data: {              

			msg_from_js: 'Hello from jQuery'            

			},            

			success(response) {              

				$('#foo').html(response.msg);            

				}        

				});        

				});      

				});    
</script>  
</head>  

<body>    

<a href="#" id="linky">Click</a>    

<div id="foo"></div>  


</body>
</html>

trq · March 21, 2012

What does the error say? I didn't test any of the code I posted.

Shadowing · March 21, 2012

says its expecting a bracket } line 27 which is line success(response) {

maybe i should use FF and download this thing called fire bug i hear so much about to see java script errors better

I dont understand the syntax at all when "success" starts. cause for how im reading it its following parameters. So is that suppose to be part of the data parameter or a new one

trq · March 21, 2012

If your going to be working with JavaScript then Firefox's firebug is a must, though if you use Chrome, it has similar (and just as good imo) tools built in.

trq · March 21, 2012

This line:

dataType: json,

should be:

dataType: 'json',

Shadowing · March 21, 2012

alright i have firebug now

I cant see where it shows errors on it though.

I added the quotes around json and still have the error.

IE is saying expecting : on line 27

I should of noticed the quotes not being around json my text editor was saying something was wrong and I didnt realize it. I notice the comma before success. so success is acting as the 5th parameter? how can that be shouldnt each parameter be a word followed by a colon? trying to understand the syntax on how its changing towards last

trq · March 21, 2012

Ha, it's getting late. Didn't even notice that.

success(response) {
    $('#foo').html(response.msg);
}

Should be:

success: function(response) {
    $('#foo').html(response.msg);
}

Shadowing · March 21, 2012

lol that was confusing the heck out of me haha. , cause i barley know java script as it is lol. alright its all working now.

Im going to bed. will take off from here when i wake up.

one question though. this whole json thing is new to me lol.

You are putting the POST in an array. so how do I echo each value seperatly when Im returning more then one thing in the array, do I use list() like i would a php function?

trq · March 21, 2012

It comes back as a JavaScript object. So, obj.somekey, obj.someotherkey. Which is what I have done in the examples with response.msg.

Shadowing · March 22, 2012

Sorry Thorpe, im really trying to understand this, read about json for the first time. But i dont see any json code going on in this script?

I attempted to add a 2nd return to your code

so if I understand this right

msg1_from_js is the name of the _POST im grabing from

responce is responce .key

now I want to put these into a variable i guess so i can like print var msg1 = $('#foo').html(response.msg1);

document write it i think it is for java script" as I wish in my DIV.

so i dont really want to mention the #foo id. also i noticed if i just do this

$('#foo').html(response.msg1);

$('#foo').html(response.msg2);

The second one just over writes the first one lol.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN"  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<script type="text/javascript" src="/system_lords/jquery/jquery-1.7.1.min.js"></script>

<script>      

$(document).ready(function() {        

$("#linky").click(function() {          

	$.ajax({            

		url: 'foo.php',            

		type: 'POST',            

		dataType: 'json',            

		data: {              

			msg1_from_js: 'Hello from jQuery',            
			msg2_from_js: 'Hello again from jQuery'
			},            

			success: function(response) {              

				var msg1 = $('#foo').html(response.msg1);            
				var msg1 = $('#foo').html(response.msg2);
				}        

				});        

				});      

				});    
</script>  
</head>  
<body>    

<a href="#" id="linky">Click</a>    

<div id="foo"></div>  

</body>
</html>

<?php
echo json_encode(array('msg1' => $_POST['msg1_from_js'] , 'msg2' => $_POST['msg2_from_js']));
?>

Shadowing · March 22, 2012

oh maybe it is a cleaner better idea to just make a new Div for every return?

Shadowing · March 22, 2012

Ahh i just got rid of the foo.php file and it still works. so ajax isnt even reading from the file its just posting whats in data:

thats makes sense why the keys wasnt working cause it wasnt even reading from an array or anything.

Shadowing · March 22, 2012

I got rid of the data field and then added something into the array and it works. so now i know im grabing from the file.

I dont understand how its was able to echo it when i got rid of the php array in the php file.

cause its response.msg so i would think it could only grab the key in the php file.

Shadowing · March 22, 2012

lol i dont know what was going on. probably cause i have to many windows open. but everything i said was going on wasnt. when i delete the php code it doesnt work at all like it should. I had the example up in another window so i think i edited it which wasnt the real foo.php file.

Shadowing · March 22, 2012

Hey Thorpe thanks alot, i got everything figured out now.

figured out how to grab form data and pass variables to the php file. Man my mind is going a million miles an hour thinking of all the kewl stuff i can build now knowing how to use ajax.

in a few months im going to make a much more advance game map. in the mean time i want to make a chat system.

I really like using Json.

Shadowing · March 28, 2012

Hey thorpe

is it possible to tell ajax to call a php function from a php file or am I stuck with having to use a new php file for every php script I want to run? I sure hope there is a way cause that is going to be messy creating so many files.

trq · March 28, 2012

Iv'e siad this before but it's just anormal request. Just like you requesting a page with your browser.

In order to have a function executed you could use a simple series of if statement, or build a very simple front controller:

<?php

if (isset($_GET['action')) {
  if (function_exists('action' . ucfirst($_GET['action'])) {
    $func = 'action' . ucfirst($_GET['action']);
    $func();
  }
}

function actionFoo() {
  return json_encode(array('msg' => 'Hello from foo()'));
}

// more functions.

Then just use a url such as /somepath/somescript?action=foo in your Ajax call.

Shadowing · March 28, 2012

holy crap thats an amazing idea

thanks man. I would of never of doing that. I googled that for a hour and no one mentioned doing this lol.

I just realize i could use a php switch for this for the first time if i have alot of functions on a page.

Sign In

Returning something

Recommended Posts

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Link to comment

Share on other sites

Archived

Important Information