How to create a JSON rest webservice in php without using any library?

Question

I want to create a hello world json rest webservice in test.php:

  <?php header("Content-type: application/json; charset=utf-8");


     $test[] = "hello";  
     $test[] = "world";  

    $json = json_encode($test);
    echo $json;    
  ?>

But nothing is returned when I test it with ajax below why ?

<html>
<head>
<script>
function test()
{ 
    var xhr; 
    try {  xhr = new ActiveXObject('Msxml2.XMLHTTP');   }
    catch (e) 
    {
        try {   xhr = new ActiveXObject('Microsoft.XMLHTTP');    }
        catch (e2) 
        {
          try {  xhr = new XMLHttpRequest();     }
          catch (e3) {  xhr = false;   }
        }
     }

    xhr.onreadystatechange  = function()
    { 
         if(xhr.readyState  == 4)
         {
              if(xhr.status  == 200) 
                  alert(xhr.responseText); 
              else 
                 alert("Error code " + xhr.status);
         }
    }; 

   xhr.open(GET, "test.php",  true); 
   xhr.send(null); 
} 
</script>
</head>

<body>
<script>
test();
</script>
 </body>
 </html>

Because I want to learn the basics first (json + xmlhttprequest) — user310291
– user310291, Commented Oct 30, 2010 at 16:56

Quentin · Accepted Answer · 2010-10-30 13:11:54Z

1

You have spaces before your PHP code starts, so the header call will error
You're setting a text/html Content-Type for JSON data, it should be application/json
You are are replacing the reference to the input element in the form with a string, you probably want to set it's .value property instead. (For that matter, you should probably be accessing it as document.forms.id_of_form.elements.dyn.value for clarity) (Using an input to display output is a rather dubious practice in the first place though)

answered Oct 30, 2010 at 13:11

Quentin

949k136 gold badges1.3k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user310291 Over a year ago

I have taken into account 1 & 2. Instead of 3 I just want to show alert but it doesn't work.

Collectives™ on Stack Overflow

How to create a JSON rest webservice in php without using any library?

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related