php - Request ready state always returns 0? -


i new javascript , trying play ajax dynamically load html <div> element. have php page spits out json html needed insert <div>. have been testing , cannot call work. started alerts on readystate, , 0 , nothing else. understanding, function senddata() should called every time readystate changes, appears once, or readystate never changes, gets called once...?

this php

<?php     $array['html'] = '<p>hello, menu here</p>';     header('content-type: application/json');     echo json_encode($array); ?>

this html

<!doctype html> <html> <head> <title>veolia water - solutions , technologies dashboard</title>   <meta http-equiv="content-type" content="text/html;charset=utf-8" />     <meta name="description" content="veolia water - dashboard"/> <meta http-equiv="imagetoolbar" content="no" /> <meta author="nathan sizemore"/> <link rel="stylesheet" href="./css/stylo.css" media="screen"/> </head> <body>     <div id="menu">     </div>     <div id="content">     </div> </body> <script src="./js/dashboard.js"></script> </html>

this javascript

var request; window.onload = function()  {      load_menu(); }  //load menu function function load_menu() {        request = gethttpobject();     alert(request.readystate);     request.onreadystatechange = senddata();     request.open("get", "./php/menu.php", true);     request.send(null); }  function gethttpobject() {     var xhr = false;     if (window.xmlhttprequest)     {         xhr = new xmlhttprequest();     }      else if (window.activexobject)      {         try         {             xhr = new activexobject("msxml2.xmlhttp");         }         catch(e)         {             try             {                 xhr = new activexobject("microsoft.xmlhttp");             }             catch(e)             {                 xhr = false;             }         }     }     return xhr; }  function senddata() {     alert(request.readystate);     // if request object received response     if (request.readystate == 4)     {         var json = json.parse(request.responsetext);         document.getelementbyid('menu').innerhtml = json.html;         alert(json.html);     } }

thanks in advance help!

nathan

use this:

request.onreadystatechange = senddata;

note () removed senddata()

what had before executing senddata , returning result onreadystatechange. since nothing returned, value undefined. wasn't setting onreadystatechange , therefore not executing when state changes. onreadystatechange property expects reference function...which senddata is.

in code, since senddata executed once (accidentally), state reported 0 (the xhr's initial state).


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