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2015/12/12--javascript event handling and some advanced JavaScript instances

Source: Internet
Author: User
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<script type = "Text/javascript" >

Create a welcome cookie

function GetCookie (c_name) {

if (Document.cookie.length > 0) {

C_start.document.length.indexof (c_name + "=");

if (C_start! =-1) {

C_start = C_start + c_name.length + 1;

C_end = Document.cookie.indexof (":", C_start);

if (c_end = =-1) {

C_end = Document.cooklie.length;

Return unescape (document.cookie.substring (c_start,c_end));

}

}

}

Return "";

}

function Setcookie (c_name,value,expiredays) {

var exdate = new Date ();

Exdate.setdate (exdate.getdate () + expiredays);

Document.cookie = c_name + "=" + Escape (value) + ((espiredays = = null)? "": "Expires =" +exdate.togmtstring ())

}

function Checkcookie () {

if (userName! = NULL && UserName! = "") {

Alert ("Welcome again" + UserName + "!");

}else{

UserName = ("Please enter your name:" + "");

if (userName! = NULL && UserName! = "") {

Setcookie ("UserName", username,365);

}

}

}

Try: Catch statement

var txt = "";

Function message () {

try{

Adddlert ("Welcome guest!");

}

catch (Err) {

TXT = "There are errors on this page!" \ n ";

TXT + = "error description:" Err.Description "\ n";

TXT + = "Click" OK "button to continue. \ n";

alert (TXT);

}

}

</script>

Try with confirmation box: Catch statement

<script type = "Text/javascript" >

var txt1 = "";

function Message1 () {

try{

Adddlert ("");

}catch (Err) {

TXT = "There are errors on this page. \ n ";

TXT + = "click" OK "to continue viewing this page";

TXT + = "click" To cancel "return to this page";

if (!confirm (TXT) {

Document.location.href = "./index.html";

}

}

}

onerror = Handleerr;

var txt = "";

function Handleerr (msg,ur1,1) {

TXT = "There are errors on this page!" \ n ";

TXT + = "Error" + msg + "\ n";

TXT + = "URL" + ur1 + "\ n";

TXT + = "line" + 1 + "\ n";

TXT + = "click" OK "to continue. \ n ";

}

function Message2 () {

Adddlert ("Welcome guest!");

}

</script>

<body onload = "Detectbrowser ()" >

<script type = "Text/javascript" >

Use for: In iterates over the elements in the array

var x;

var mycars = new Array ();

Mycars[0] = "BMW";

MYCARS[1] = "Mercedes-Benz";

MYCARS[2] = "Bentley";

for (x in Mycars) {

document.write (Mycars [x] + "<br>");

}

</script>

<input type = "button" onclick = "message ()" VALUE = "View Message" >

<input type = "button" onclick = "message1 ()" VALUE = "View" >

<input type = "button" onclick = "message2 ()" value = "Look here" >

Throw declaration

<script type = "Text/javascript" >

var x = prompt ("Please enter an integer between 0-10:", "");

Try (x > 10) {

if (x > Ten) throw "ERR1";

else if (x < 0) throw "ERR2";

else if (IsNaN) throw "ERR3";

}catch (Err) {

if (err = = "Err1") {

Alert ("Error! The value is too large! ");

if (err = = "Err2") {

Alert ("Error! The value is too small! ");

if (err = = "Err3") {

Alert ("Error! This value is not a number! ");

}

}

}

}

Detecting browsers and their versions

var browser = navigator.appname;

var b_version = navigator.appversion;

var version = parsefloat (b_version);

document.write ("Browser name:" + browser);

document.write ("<br>");

document.write ("browser version" + b_version);

More information on detecting browsers

document.write ("<p> browser");

document.write (navigator.appname + "</P>");

document.write ("<p> browser version");

document.write (navigator.appversion + "</p>");

document.write ("<p> Code:");

document.write (Navigator.appcode + "</p>");

document.write ("<p> platform");

document.write (navigator. Platform + "</p>");

document.write ("<p>cookies enabled");

document.write (navigator. cookieenabled + "</p>");

document.write ("<p> Browser user Agent header");

document.write (navigator.useragent + "</p>");

Detect all of your browser's information

var x = navigator;

document.write ("<br>");

document.write ("MinorVersion =" + appminorversion);

document.write ("<br>");

document.write ("codename =" + appCodeName);

document.write ("<br>");

document.write ("Name =" + AppName);

document.write ("<br>");

document.write ("Version =" + appversion);

document.write ("<br>");

document.write ("cookieenabled =" + cookieenabled);

document.write ("<br>");

document.write ("online =" + online);

document.write ("<br>");

document.write ("cpuclass =" + Cpuclass);

document.write ("<br>");

document.write ("Platform =" + Platform);

document.write ("<br>");

document.write ("US =" + useragent);

document.write ("userlanguage =" + userlanguage);

document.write ("<br>");

document.write ("systemlanguage =" + systemlanguage);

document.write ("<br>");

document.write ("browserlanguage =" + browserlanguage);

Alert users based on browser type

function Detectbrowser () {

var browser1 = navigator.appname;

var b_version1 = navigator.appversion;

var version1 = parsefloat (b_version);

if (Browser1 = = "Netscape" | | browser = = "Microsoft Internet Explorer") {

Alert ("Your browser is very advanced!") ");

}else{

Alert ("You should improve your navigator!");

}

}

</script>

</body>

2015/12/12--javascript event handling and some advanced JavaScript instances

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