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notes:javascript_cheat_sheet [2026/06/07 02:32]
14.191.194.231 old revision restored (2026/05/31 00:58) 		notes:javascript_cheat_sheet [2026/06/07 15:47] (current)
38.252.202.246 old revision restored (2008/09/04 02:23)
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   * JavaScript is the most popular scripting language on the internet and works in all major browsers.   * 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 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).   * JavaScript was invented by Brendan Eich of Netscape but is now known officially as ECMAScript (current version is ECMA-262).
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   * Statements may omit the final semi-colon but should not.   * Statements may omit the final semi-colon but should not.
   * Blocks may be grouped together using curly braces { }.   * Blocks may be grouped together using curly braces { }.
-  * JavaScript uses java-style comments: %%//%% and /* */.+  * JavaScript uses java-style comments: // and /* */.
   * JavaScript variables are case-sensitive and must begin with a letter or underscore.   * JavaScript variables are case-sensitive and must begin with a letter or underscore.
   * Variables are automatically declared when first used but should be explicitly declared using e.g. var a = 5;   * Variables are automatically declared when first used but should be explicitly declared using e.g. var a = 5;
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 ==== Basic Structures ==== ==== Basic Structures ====
  
-  * if {} else if {} else {} +  * 
-  * for (var=start;var%%<=%%end;var=var+inc) {} +
-  * while (condition) {} +
-  * do {} while (condition) ; +
-  * //break// and //continue// both valid in a loop. +
-  * for (element in array) {} +
-  * for (property in object) {} +
-  * switch (n) { case 1: stmt; break; default: stmt; } +
-  * function name(var1,var2,...) {} +
-  * \", \n, \t, \r, \', \&, \\ +
- +
-==== Events, Error Handling and Popups ==== +
-  *  try { throw "errname"; } catch(err) {} +
-  * onerror=handleErr; handleErr(msg,url,linenum) +
-  * if handleErr returns false, browser displays a standard error message in the JavaScript console. +
- +
-  * an alert box just has an OK button - alert("msg") +
-  * a confirm box returns true if the user clicks OK, false if he clicks cancel - confirm("msg") +
-  * a prompt box allows the user to enter a value. It returns true if the user clicks OK, false if he clicks cancel - prompt("msg","defaultvalue"); +
- +
-  *  JavaScript functions can be registered to run on certain events (event="jscode" in an HTML element): +
-    * onunload, onload (page or image), onresize, onabort +
-    * onfocus, onblur, onclick, ondblclick +
-    * onmouseover, onmouseout, onmousemove +
-    * onchange, onsubmit, onreset, onselect +
-    * onkeydown, onkeypress, onkeyup +
-    * onmousedown, onmouseup +
- +
-==== JavaScript Objects ==== +
-  * Objects have properties and methods. +
-  * 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.+
notes/javascript_cheat_sheet.1780824758.txt.gz · Last modified: 2026/06/07 02:32 by 14.191.194.231

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