I have a php script that returns an echo of 'Hello' when accessed half the time (just based on a random number).
Is it possible to make a javascript script on a HTML page that will:
Go to the the PHP page,
If 'Hello' is returned it will show an alert of 'Goodbye'
ELSE
It shows 'nothing found'
What do I need to do this?
That is called AJAX. Example:
var msg = 'Nothing found';
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
if (xhr.readyState == 4 && xhr.status == 200) {
alert(xhr.responseText != "Hello" ? msg : "Goodbye");
}
};
xhr.open('GET', 'http://example.com', true);
xhr.send(null);
See also:
https://developer.mozilla.org/en/AJAX/Getting_Started
Best would be to use jQuery and Ajax to fetch the page.
$.ajax({
type:"GET",
url:"file.php",
data:id, // if you want to pass a param, optional
success:function(data){
alert(data);//do something with data
}});
Since the information is not very confidential, I can suggest you to use Cookies (in case you don't want to use AJAX, but I still recommend you to use AJAX). People don't usually take the advantage of Cookies.
So, in PHP file, set the Cookies with your information:
$value = 'Hello';
setcookie("Information", $value);
And get it from HTML using Javascript (from W3School)
function getCookie(c_name)
{
var i,x,y,ARRcookies=document.cookie.split(";");
for (i=0;i<ARRcookies.length;i++)
{
x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
x=x.replace(/^\s+|\s+$/g,"");
if (x==c_name)
{
return unescape(y);
}
}
}
You could also just include the page in an iframe (with or without a meta-refresh) and instead of echoing 'hello' you would echo the javascript alert ;)
