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Pobranie listy odnośników ze strony - AJAX i PHP

Skrypt pobiera/sprawdza linki umieszczone na podanej stronie.

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//index.html #############################################

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Ajax</title>
<link href="ajaxcss.css" rel="stylesheet" type="text/css">
<script src="ajaxcore.js" type="text/javascript"></script>
<script src="ajax.js" type="text/javascript"></script>
</head>
<body>
<div id="mainDiv" class="mainDiv">
<div>
<a href="http://helion.pl">http://helion.pl</a><br>
<a href="http://marcinlis.com">http://marcinlis.com</a><br>
<a href="http://google.comp">http://google.comp</a><br>
</div>
<div style="width:50%;margin:0 auto;text-align:center;">
<input type="button" value="Sprawdź" class="myButton" id="btnSprawdz"
onclick="startRequest();" style="margin-top:10px;" />
</div>
</div>
<div id="dataDiv" class="dataDiv">
</div>
</body>
</html>

//dane.php #############################################

<?php
if(isSet($_GET["urls"]) && $_GET["urls"] != ""){
$urls = explode("\n", $_GET["urls"]);
$good = Array();
$bad = Array();
foreach($urls as $url){
if($id = @fopen(trim($url), 'r')){
$good[] = $url;
fclose($id);
}
else{
$bad[] = $url;
}
}
echo "<b>Adresy poprawne</b>:<br>";
foreach($good as $url){
echo $url . "<br>";
}
echo "<b>Adresy niepoprawne</b>:<br>";
foreach($bad as $url){
echo $url . "<br>";
}
}
else{
echo "Proszę podać adresy do sprawdzenia.";
}
?>

//ajaxcss.css #############################################

.mainDiv
{
color: #333333;
position: relative;
background-color: #EFEFEF;
border: 1px solid #000000;
margin: 10px 10px 10px 10px;
padding: 14px 14px 14px 14px;
width: 350px;
visibility: visible;
}

.dataDiv
{
color: #333333;
position: relative;
background-color: #ffffff;
border: 1px solid #000000;
margin: 10px 10px 10px 10px;
padding: 14px 14px 14px 14px;
width: 420px;
visibility: visible;
}

.myButton
{
font-family:helvetica,sans-serif;
font-size:84%;
font-weight:bold;
border:1px solid;
border-top-color:#696;
border-left-color:#696;
border-right-color:#363;
border-bottom-color:#363;
width:120px;
margin:5px;
}

.myTextInput
{
border:1px solid;
background-color: #F8F8F8;
border-top-color:#696;
border-left-color:#696;
border-right-color:#363;
border-bottom-color:#363;
width:70%;
}

//ajaxcore.js #############################################

function getXMLHttpRequestObject()
{
try{
return new XMLHttpRequest();
}
catch(e){
try{
return new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e){
return false;
}
}
}

function startGETRequest(url, onComplete, onEnd)
{
var XMLHttpRequestObject = getXMLHttpRequestObject();
if(XMLHttpRequestObject){
XMLHttpRequestObject.open("GET", url);
XMLHttpRequestObject.onreadystatechange = function()
{
if (XMLHttpRequestObject.readyState == 4){
if(XMLHttpRequestObject.status == 200){
var responseXML = XMLHttpRequestObject.responseXML;
var responseText = XMLHttpRequestObject.responseText;
onComplete(responseText, responseXML);
}
delete XMLHttpRequestObject;
onEnd();
}
}
XMLHttpRequestObject.send(null);
}
}

function startPOSTRequest(url, params, onComplete, onEnd)
{
var XMLHttpRequestObject = getXMLHttpRequestObject();
if(XMLHttpRequestObject){
XMLHttpRequestObject.open("POST", url);
XMLHttpRequestObject.setRequestHeader(
'Content-Type', 'application/x-www-form-urlencoded');
XMLHttpRequestObject.onreadystatechange = function()
{
if (XMLHttpRequestObject.readyState == 4){
if(XMLHttpRequestObject.status == 200){
var responseXML = XMLHttpRequestObject.responseXML;
var responseText = XMLHttpRequestObject.responseText;
onComplete(responseText, responseXML);
}
delete XMLHttpRequestObject;
onEnd();
}
}
XMLHttpRequestObject.send(params);
}
}

//ajax.js #############################################

function startRequest()
{
var btnSprawdz = document.getElementById('btnSprawdz');
btnSprawdz.value = "Czekaj";
btnSprawdz.disabled = true;

var urlsArr = document.getElementsByTagName('a');
urlsTxt = "";
for(i = 0; i < urlsArr.length; i++){
urlsTxt += urlsArr[i].href + "\n";
}

url = "http://localhost/dane.php?urls=" + urlsTxt;
url = encodeURI(url);

div = document.getElementById('dataDiv');
div.innerHTML = "...";

startGETRequest(url, onComplete, onEnd);
}

function onComplete(text, xml)
{
var div = document.getElementById('dataDiv');
div.innerHTML = text;
}

function onEnd()
{
var btnSprawdz = document.getElementById('btnSprawdz');
btnSprawdz.value = "Sprawdź";
btnSprawdz.disabled = false;
}