ajax only working once
I am wanting to convert my website to ajax so I have been playing with it. I wrote a simple HTML page and PHP script but when I run it I keep getting the same time back. I am sure I am missing something simple but cant figure it out.
PHP
<?php
echo date("Y.m.d H:i:s", $开发者_如何学运维_SERVER['REQUEST_TIME']);
?>
HTML
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
<script language="javascript" type="text/javascript">
<!--
//Browser Support Code
function ajaxFunction(){
var ajaxRequest; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
// Create a function that will receive data sent from the server
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
document.myForm.time.value = ajaxRequest.responseText;
}
}
ajaxRequest.open("POST", "serverTime.php", true);
ajaxRequest.send(null);
}
//-->
</script>
</head>
<body>
<form name='myForm'>
Name: <input type='text' name='username' /> <br />
Time: <input type='text' name='time' />
<input type="button" onclick="ajaxFunction();" value="here">
</form>
</body>
</html>
Every time I click the button I get the same time back. This makes me think that I am only talking to the server once. I want to be able to click the button every second and see the time change. Do I need some kind of code to reset my request each time?
Thanks in advance for any help. I need to understand this before I can move forward.
Responses may be cached by the browser. A simple hacky solution is to append a random get parameter to the url, e.g. var url = "http://www.example.com/?rand=" + Math.random();
You're using $_SERVER['REQUEST_TIME'] which returns the time of the initial request. You need to use either time() or omit that parameter altogether.
move the ajaxRequest.open("POST", "serverTime.php", true); before ajaxRequest.onreadystatechange = function() line.
here is the ajax order
open() onreadystatechange send()
加载中,请稍侯......
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