如果网站存在AJAX，则验证

Question

I'm trying to check if a website exists with an ajax call, but I'm not sure I am getting it right. On my page I grab a URL on click

$("#go").click(function() {
    var url = $("#url").val();
    $.ajax({
        type: "POST",
        url: "/ajax.php",
        data: "url="+url,
        success: function(){
          $("#start").remove();
        },      
        error: function(){
        alert("Bad URL");
        }
    });     
});

a=And then check on ajax.php

$url = $_POST['url'];

ini_set("default_socket_timeout","05");
set_time_limit(5);
$f=fopen($url,"r");
$r=fread($f,1000);
fclose($f);
if(strlen($r)>1) {
    return true;
} else {
    return false;
}

It seems I am getting SUCCESS no matter what... What am I missing?

Answer 1

It seems I am getting SUCCESS no matter what... What am I missing?

This is extremely pretty straightforward.

Because of this reasons:

// You have no idea what server respond is.
// that is you can't parse that respond
success: function(){
   $("#start").remove();
}

Which should be

success: function(respond){

   //you don't have to return TRUE in your php
   //you have to echo this one instead
   if ( respond == '1'){
     $("#start").remove();
   } else {
     //handle non-true if you need so
   }
}

In php replace this:

if(strlen($r)>1) {
    return true;
} else {
    return false;
}

to

if(strlen($r)>1) {
    print true; //by the way, TRUE is a constant and it equals to == 1 (not ===)
}

Oh yeah, also don't forget to fix this as well:

data: "url="+url,

to data : {"url" : url}