15 Cool JavaScript Beispielschnipsel

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  • Aktualisiert: Mar 06, 2012

Ein kurzer Überblick über JavaScript

JavaScript is used everywhere online these days – to improve website interactivity, to validate information, and/or to improve a website outlooks. JavaScript first appeared in 1995 and has come a long way since then in terms of being accepted and how it is used. The syntax used in JavaScript was strongly influenced by C; but Java, Pearl, Python, and Scheme also played its part too.

Was ist JavaScript?

Es gibt einen alten YouTube-Clip, der die Frage gut beantwortet. Hier geht.

Anfänger Tipps: Was Sie wissen müssen?

Für den Anfang sind ein paar Grundlagen, die Sie wissen müssen, sind:

  • JavaScript can be turned off in the browser
  • JavaScript will run each time a page is loaded
  • JavaScript takes time to load on a slow Internet connection
  • JavaScript is still ran from cached pages
  • You can host JavaScript within a web page or externally from a .js file
  • JavaScript is completely different than Java

It is also important to understand that JavaScript will actually lead to disaster when it’s used in a wrong way. Poorly configured and sloppy coded JavaScripts will slow your website and damage the overall site navigation. This in turn affect the return rate of your visitors (due to bad user experience) as well as search engine rankings (due to slow website response rates). To help validate my case here, put yourself in the shoes of a viewer. If a website you were visiting loaded slowly, was difficult to navigate, and in overall, unappealing – would you return to the site? I wouldn’t.

Below is a small list of things to think about when adding JavaScript to your website.

  • Is JavaScript required for the site to function properly?
  • What will the site look like if the JavaScript was blocked?
  • Will the JavaScript harm the server performance?
  • Will adding the JavaScript help move your site in the direction you want it to go?

No, I am not trying to scare you away with these points. In fact, don’t be afraid to use JavaScript on your websites as it provides tons benefits and, as mentioned, it’s used by the majorities. The key point I am trying to get across here is don’t just keep adding JavaScript features to a site when they are unnecessary. Some sites are will need more JavaScript than the rest; some just need less – Just because one site is doing it doesn’t mean you should do the same.

Freebies: 15 Cool JavaScript Snippets For Your Website

JavaScript-Snippet

Now, let’s get down to the stuffs that you came here for – below is a list of 15 JavaScript snippets that will enhance your site in either functionality or appearance. The code will be broken down into two sections, the head and body or .js file. If no section title is given then it is not needed for that particular snippet.

Understanding HTML5 Video

Schnelle Probe

<script type="text/javascript">

function understands_video() {
return !!document.createElement(‘video’).canPlayType; // boolean
}

if ( !understands_video() ) {
// Muss ein älterer Browser oder IE sein.
// Maybe do something like hide custom
// HTML5-Steuerelemente Oder Wasauchimmer…
videoControls.style.display = ‘none’;
}

</ Script>

Was macht das JavaScript-Snippet?

This little snippet will prevent your website from trying to display a video that the browser cannot support, saving you bandwidth and processing power.

JavaScript Cookies

Schnelle Probe

<script type="text/javascript">

/ **

* Setzt ein Cookie mit dem angegebenen Namen und Wert.

*

* name Name des Cookies

* value Wert des Cookies

* [verfällt] Ablaufdatum des Cookies (Standard: Ende der aktuellen Sitzung)

* [Pfad] Pfad, in dem das Cookie gültig ist (Standard: Pfad des aufrufenden Dokuments)

* [Domäne] Domäne, in der das Cookie gültig ist

* (Standard: Domäne des aufrufenden Dokuments)

* [Secure] Boolescher Wert, der angibt, ob für die Cookie-Übertragung ein

* sichere Übertragung

*/

Funktion setCookie (Name, Wert, abläuft, Pfad, Domäne, sicher) {

document.cookie = name + "=" + escape (Wert) +

((läuft ab)? "; verfällt =" + verfällt.toGMTString (): "") +

((Pfad) "; path =" + path: "") +

((Domäne)? "; Domäne =" + Domäne: "") +

((Secure) "; secure": "");

}

</ Script>

<script type="text/javascript">

/ **

* Ruft den Wert des angegebenen Cookies ab.

*

* name Name des gewünschten Cookies.

*

* Gibt eine Zeichenfolge zurück, die den Wert des angegebenen Cookies enthält.

* oder null, wenn kein Cookie existiert.

*/

Funktion getCookie (Name) {

var dc = document.cookie;

var prefix = name + "=";

var begin = dc.indexOf (";" + Präfix);

if (begin == -1) {

begin = dc.indexOf (Präfix);

if (begin! = 0) gibt null zurück;

} Else {

begin + = 2;

}

var end = document.cookie.indexOf (";", begin);

if (end == -1) {

end = dc.length;

}

return unescape (dc.substring (begin + prefix.length, end)));

}

</ Script>

<script type="text/javascript">

/ **

* Löscht den angegebenen Cookie.

*

* Name Name des Cookies

* [Pfad] Pfad des Cookies (muss dem Pfad entsprechen, der zum Erstellen des Cookies verwendet wird)

* [Domäne] Domäne des Cookies (muss mit der zum Erstellen des Cookies verwendeten Domäne identisch sein)

*/

Funktion deleteCookie (Name, Pfad, Domäne) {

if (getCookie (Name)) {

document.cookie = name + "=" +

((Pfad) "; path =" + path: "") +

((Domäne)? "; Domäne =" + Domäne: "") +

"; erlischt = Do, 01-Jan-70 00: 00: 01 GMT";

}

}

</ Script>

Was macht das JavaScript-Snippet?

This snippet is a little long but very useful, it will allow your site to store information on the viewer’s computer then read it at another point in time. This snippet can be used in many different ways to accomplish different tasks.

Preload your images

Schnelle Probe

<script type="text/javascript">

var images = neues Array ();

Funktion preloadImages () {

für (i = 0; i <preloadImages.arguments.length; i ++) {

Bilder [i] = neues Bild ();

images [i] .src = preloadImages.arguments [i];

}

}

preloadImages ("logo.jpg", "main_bg.jpg", "body_bg.jpg", "header_bg.jpg");

</ Script>

Was macht das JavaScript-Snippet?

This snippet will prevent your site from having that awkward time when it is only displaying part of the site; this not only looks bad but is also unprofessional. All you have to do is add your images to the preloadImages section and you are ready to roll.

E-mail Validation

Schnelle Probe

Kopf:

<script type="text/javascript">
function validateEmail(theForm) {
if (/^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/.test(theForm.email-id.value)){
return (true);
}
alert("Invalid e-mail address! Please enter again carefully!.");
return (false);
}
</ Script>

Körper:

<form onSubmit="return validateEmail(this);" action="">
E-Mail-Addresse:
<input type="text" name="emailid" />
<input type="submit" value="Submit" />
<input type="reset" value="Reset" />

Was macht das JavaScript-Snippet?

This snippet will validate that a properly formatted E-mail address is entered in a form, it cannot guarantee that the E-mail address is real, there is no way to check for that with JavaScript.

No Right-Click

Schnelle Probe

<script type="text/javascript">
function f1() {
if(document.all) { return false; }
}
function f2(e) {
if(document.layers || (document.getElementById &! document.all)) {
if(e.which==2 || e.which==3) { return false; }
}
}
if(document.layers) {
document.captureEvents (Ereignis.MOUSEDOWN);
document.onmousedown = f1;
}
else {
document.onmouseup = f2;
document.oncontextmenu = f1;
}
document.oncontextmenu = new function("return false");
</ Script>

Was macht das JavaScript-Snippet?

This snippet will prevent the viewer from being able to right-click on your page. This can discourage the average user from borrow images or code from your site.

Zeige zufällige Anführungszeichen an

Schnelle Probe

Toilette:

<script type="text/javascript">
writeRandomQuote = function () {
var quotes = new Array();
quotes[0] = "Action is the real measure of intelligence.";
quotes[1] = "Baseball has the great advantage over cricket of being sooner ended.";
quotes[2] = "Every goal, every action, every thought, every feeling one experiences, whether it be consciously or unconsciously known, is an attempt to increase one’s level of peace of mind.";
quotes[3] = "A good head and a good heart are always a formidable combination.";
var rand = Math.floor(Math.random()*quotes.length);
document.write (Anführungszeichen [Rand]);
}
writeRandomQuote ();
</ Script>

Körper:

<script type="text/javascript">writeRandomQuote();</script>

Was macht das JavaScript-Snippet?

Ok so this is not a snippet that all sites would use but it can be used to display more than just random quotes. You can change the content ok the quotes to whatever you want and have random images or text displayed anywhere on your site.

Previous/Next Links

Schnelle Probe

<a href="javascript:history.back(1)">Previous Page</a> | <a href="javascript:history.back(-1)">Next Page</a>

Was macht das JavaScript-Snippet?

This snippet is great if you have multiple pages on an article or tutorial. It will allow the user the browse between the pages with ease. It is also small and light weight from a resource point of view.

Bookmark a Page

Schnelle Probe

<a href="javascript:window.external.AddFavorite(‘http://www.yoursite.com’, ‘Your Site Name’)">Add to Favorites</a>

Was macht das JavaScript-Snippet?

This snippet will allow the user to bookmark your page with ease; all they have to do is click the link. Its little features like this that can increase your viewers overall experience.

Einfacher Print Page Link

Schnelle Probe

<a href="javascript:window.print();">Print Page</a>

Was macht das JavaScript-Snippet?

This little link will allow your views to easily print your page. It utilizes the quick print feature already setup by your browser and utilizes no resources until it is clicked.

Formatiertes Datum anzeigen

Schnelle Probe

Toilette:

<script type="text/javascript">
function showDate() {
var d = new Date();
var curr_date = d.getDate();
var curr_month = d.getMonth() + 1; //months are zero based
var curr_year = d.getFullYear();
document.write(curr_date + "-" + curr_month + "-" + curr_year);
}
</ Script>

Körper:

<script type="text/javascript">showDate();</script>

Was macht das JavaScript-Snippet?

This snippet will allow you to display the current date anywhere on your webpage and does not need to be updated. Simply put it in place and forget about it.

Komma Trennzeichen

Schnelle Probe

Toilette:

<script type="text/javascript">
function addCommas(num) {
num += ”;
var n1 = num.split(‘.’);
var n2 = n1[0];
var n3 = n1.length > 1 ? ‘.’ + n1[1] : ”;
var temp = /(d+)(d{3})/;
while (temp.test(n2)) {
n2 = n2.replace(temp, ” + ‘,’ + ”);
}
var out = return n2 + n3;
document.write (aus);
}
</ Script>

Körper:

<script type="text/javascript">addCommas("4550989023");</script>

Was macht das JavaScript-Snippet?

This snippet would be used mainly by sites that use numbers often. This snippet will keep your numbers looking the same across the board. All you have to do is copy the body line where you want to add a number and replace the number there with your number.

Holen Sie sich den Anzeigebereich eines Browsers

Schnelle Probe

<script type="text/javascript">

<! -

var fensterbreite;

var darhartheight;

// die mehr standardkonformen Browser (mozilla / netscape / opera / IE7) verwenden window.innerWidth und window.innerHeight

if (typeof window.innerWidth! = 'undefiniert')

{

viewportwidth = window.innerWidth,

viewportheight = window.innerHeight

}

// IE6 im standardkonformen Modus (dh mit einem gültigen Doctype als erste Zeile im Dokument)

sonst if (typeof document.documentElement! = 'undefiniert'

&& typeof document.documentElement.clientWidth! =

'undefined' && document.documentElement.clientWidth! = 0)

{

viewportwidth = document.documentElement.clientWidth,

viewportheight = document.documentElement.clientHeight

}

// ältere Versionen von IE

sonst

{

viewportwidth = document.getElementsByTagName ('body') [0] .clientWidth,

viewportheight = document.getElementsByTagName ('body') [0] .clientHeight

}

document.write ('<p> Ihre Ansichtsfensterbreite ist' + viewportwidth + 'x' + viewhartheight + '</ p>');

// ->

</ Script>

Was macht das JavaScript-Snippet?

This snippet will allow you to get the width and height of the display area in your views browser. This will give the designer the ability to create and use different displays based on the size of the user’s browser window.

Redirect with Optional Delay

Schnelle Probe

<script type="text/javascript">

setTimeout ("window.location.href =."

"http://walkerwines.com.au/" ", 5 * 1000);

</ Script>

Was macht das JavaScript-Snippet?

This snippet will allow you to redirect your viewers to another page and it has the option of setting a delay. The use of this snippet is pretty self-explanatory and it is a very valuable tool to have in your belt.

Detect iPhones

Probe

<script type="text/javascript">

if ((navigator.userAgent.match (/ iPhone / i)) || (navigator.userAgent.match (/ iPod / i))) {

if (document.cookie.indexOf ("iphone_redirect = false") == -1) {

window.location = "http://m.espn.go.com/wireless/?iphone&i=COMR";

}

}

</ Script>

Was macht das JavaScript-Snippet?

Mit diesem Snippet können Sie feststellen, ob sich Ihr Viewer auf einem iPhone oder iPod befindet, sodass Sie anderen Inhalt anzeigen können. Dieser Ausschnitt ist von unschätzbarem Wert für die Größe des mobilen Marktes und wird nur weiter wachsen.

Print Message to Status Bar

Schnelle Probe

<script language="javascript" type="text/javascript">
<! -
window.status = "<TYPE IHRE NACHRICHT>>";
/ / ->
</ Script>

Was macht das JavaScript-Snippet?

This little snippet will allow you to print a message to the status bar. You can display recent or important news in an area the will catch the eye of the user.

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