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how do you check if a link is valid

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Dec 21.2006

I saw the command the other day but I can’t recall what it is, like if was to check a link to see if existed or not

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JavaScript

6 Comments(s) ↴

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@domiereavronauthorDec 22.2006 — oh nonono

we have list of files that are divided into four links,

so the base linke is www.abc.com/blah for one or it might be under www.cbd.com/blah, what I am looking to do is to be able to search our a file to see if it was put into one of the four directories.
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@domiereavronauthorDec 22.2006 — ironically you gave me the link I wanted your the man, for the xml stuff
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@domiereavronauthorDec 23.2006 — ummm having trouble getting this code to work

var xmlhttp=false;

/*@cc_on @*/

/*@if (@_jscript_version >= 5)

// JScript gives us Conditional compilation, we can cope with old IE versions.

// and security blocked creation of the objects.

try {

xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");

} catch (e) {

try {

xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

} catch (E) {

xmlhttp = false;

}

}

@end @*/

if (!xmlhttp && typeof XMLHttpRequest!='undefined') {

try {

xmlhttp = new XMLHttpRequest();

} catch (e) {

xmlhttp=false;

}

}

if (!xmlhttp && window.createRequest) {

try {

xmlhttp = window.createRequest();

} catch (e) {

xmlhttp=false;

}

}

</script>

<script type="text/javascript">


function linkcheck(url) {

xmlhttp.open("HEAD", url,true);

xmlhttp.onreadystatechange=function() {

if (xmlhttp.readyState==4) {


if (xmlhttp.status==200) alert("URL Exists!")

else if (xmlhttp.status==404) alert("URL doesn't exist!")

else alert("Status is "+xmlhttp.status)

}

}

}

</head>

</script>

<body>


<form name="link">

<input type="text" name="reqlink">

<button onClick="linkcheck(document.link.reqlink.value)">test</button>

</form>


</body>

</html>
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@domiereavronauthorDec 23.2006 — figured out my error

correction now it is just telling me the status is 2 regardless of what I am putting in, revised code

<html>

<head>

<script type="text/javascript">

var xmlhttp=false;

/*@cc_on @*/

/*@if (@_jscript_version >= 5)

// JScript gives us Conditional compilation, we can cope with old IE versions.

// and security blocked creation of the objects.

try {

xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");

} catch (e) {

try {

xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

} catch (E) {

xmlhttp = false;

}

}

@end @*/

if (!xmlhttp && typeof XMLHttpRequest!='undefined') {

try {

xmlhttp = new XMLHttpRequest();

} catch (e) {

xmlhttp=false;

}

}

if (!xmlhttp && window.createRequest) {

try {

xmlhttp = window.createRequest();

} catch (e) {

xmlhttp=false;

}

}






function linkcheck(url) {

xmlhttp.open("HEAD", url,true);

xmlhttp.onreadystatechange=function() {

if (xmlhttp.readyState==4) {

if (xmlhttp.status==200) alert("URL Exists!")

else if (xmlhttp.status==404) alert("URL doesn't exist!")

else alert("Status is "+xmlhttp.status)

}

}

xmlhttp.send(null)

}


</script>

</head>


<body>


<form name="flink">

<input type="text" name="reqlink">

<button name="test" onClick="linkcheck(document.flink.reqlink)">test</button>

</form>


</body>

</html>
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