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--- notes:javascript_cheat_sheet [2026/11/01 21:44]
137.103.45.160 old revision restored (2026/06/30 12:01)
+++ notes:javascript_cheat_sheet [2026/11/03 05:24] (current)
87.201.184.186 old revision restored (2026/09/15 01:55)
@@ 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 27: / Line 27: @@
   * Statements may omit the final semi-colon but should not.
   * 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.
   * Variables are automatically declared when first used but should be explicitly declared using e.g. var a = 5;
@@ Line 36: / Line 36: @@
   * if {} else if {} else {}
-  * for (var=start;var%%<=%%end;var=var+inc) {}
+  * switch (n) { case 1: stmt; break; default: stmt; }
+  * 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, \', \&, \\
-  * with (object) { } changes default object for fields.
-==== 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.
-  * 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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