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--- notes:javascript_cheat_sheet [2026/07/22 05:22]
47.79.200.23 old revision restored (2026/06/15 13:11)
+++ notes:javascript_cheat_sheet [2026/07/25 23:00] (current)
41.90.40.179 old revision restored (2026/07/05 05:22)
@@ Line 8: / Line 8: @@
   * JavaScript is the most popular scripting language on the internet and works in all major browsers.
-  * It is a lightweight, interpreted, object-oriented language that is embedded into webpages to add interactivity.
+  * It is a lightweight, interpreted language that is embedded into webpages to add interactivity.
   * JavaScript can read and write HTML page elements, react to events, validate data, create cookies.
   * JavaScript was invented by Brendan Eich of Netscape but is now known officially as ECMAScript (current version is ECMA-262).
@@ Line 45: / Line 45: @@
   * function name(var1,var2,...) {}
   * \", \n, \t, \r, \', \&, \\
-  * with (object) { } changes default object for fields.
-==== Events, Error Handling & Popups ====
+==== Events, Error Handling and Popups ====
   *  try { throw "errname"; } catch(err) {}
   * onerror=handleErr; handleErr(msg,url,linenum)
@@ Line 63: / Line 62: @@
     * onkeydown, onkeypress, onkeyup
     * onmousedown, onmouseup
-==== JavaScript Objects ====
-  * Objects have properties and methods.
-  * Objects can be created directly <code javascript>
-personObj=new Object();
-personObj.firstname="John";
-personObj.newfirstname =
- function (new_firstname)
-   { this.firstname=new_firstname; } </code>
-  * Objects can be created using a template <code javascript>
-function person(firstname) {
-  this.firstname=firstname;
-  this.newfirstname =
-    function (new_firstname)
-    { this.firstname=new_firstname; }
-}
-myFather=new person("John");</code>
-  * Object methods can also be assigned by name e.g. <code javascript>
-function person(firstname)
-{
-  this.firstname=firstname;
-  this.newfirstname=newfirstname;
-}
-function newfirstname(new_firstname)
-{ this.firstname=new_firstname; } </code>
-==== Predefined Objects ====
-  * String objects have a length property and methods including: indexOf, match, replace
-  * new Date() creates a Date object (with today's date).
-  * Date objects include methods: getTime(epoch), setFullYear, toUTCString, getDay, getHours
-  * Date objects can be compared using <, > .
-  * To declare an array <code javascript> var mycars=new Array("Saab","Volvo","BMW");</code>
-  * Arrays have methods including: sort, concat, join.
-  * To sort an integer array, must use a function <code javascript> function intSort (a, b){ return a - b;}</code>
-  * The Math object contains common math routines: round, random, e, pi etc.
-  * The RegExp object supports regexp creation and searching including methods: test (t/f), exec, compile (alter).
-  * HTML DOM objects allow access to browser and webpage.
-==== Advanced JavaScript ====
-  * navigator.appName/appVersion contain the browser name and version.
-  * document.cookie allows read and write access to cookie so to set a cookie <code javascript>
-function setCookie(c_name,value,expiredays)
-{
-  var exdate=new Date();
-  exdate.setDate(exdate.getDate()+expiredays);
-  document.cookie=c_name+ "=" +escape(value)+
-    ((expiredays==null) ? "" :
-     ";expires="+exdate.toGMTString());
-} </code>
-  * The onsubmit event can be used to validate a form.
-  * document.img_name.src ="pic.gif" changes an image.
-  * To change the content of a block with a given id : <code javascript>
-document.getElementById("block_id").innerHTML=txt;</code>
-  * To set or clear a timed action: <code javascript>
-var t=setTimeout("javascript statement",milliseconds);
-clearTimeout(t); </code>

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