Existencia url adresy – JavaScript, AJAX, jQuery – Fórum – Programujte.com

Zdravim Vas, zaujimalo by ma ako overit existenciu url adresy napriklad (http://www.seznam.cz/) po zadani do formulara.
skusal som cez AJAX

	function isThere(url) {

	 httpRequest= getRequest();

	try {

	var ux = url.substring(0,url.length-1);

		httpRequest.open(\"HEAD\", url,true );

				httpRequest.send(null);

		if (httpRequest.readyState == 4 && httpRequest.status == 200) {

		return true;

		}

		else{return false;}

		



	}

	catch (er) {

		return false;

	}

}



var httpRequest = null; //new XMLHttpRequest();

function getRequest(){

 



try {



        httpRequest = new XMLHttpRequest();

    }

    catch (e) {



        try {

            httpRequest = new ActiveXObject(\"Microsoft.XMLHTTP\");

        }

        catch (e) {

            httpRequest = new ActiveXObject(\"Msxml2.XMLHTTP\");

        }

    }



return httpRequest;





}

Takto nejak by to mohlo ísť..

function isThere(url) { 

  httpRequest= getRequest(); 

  try { 

    var ux = url.substring(0,url.length-1);

    var urlExists = false;

    httpRequest.open("HEAD", url, false);

    httpRequest.onreadystatechange = function() {

      urlExists = (httpRequest.readyState == 4 && httpRequest.status == 200); 

    }

    httpRequest.send(null);

    

    return urlExists;

  } 

  catch (er) { 

    return false; 

  } 

}