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--- notes:javascript_cheat_sheet [2026/07/29 23:01]
223.123.23.146 old revision restored (2026/06/13 21:55)
+++ notes:javascript_cheat_sheet [2026/07/31 14:34] (current)
101.47.19.212 old revision restored (2026/06/04 14:43)
@@ Line 45: / Line 45: @@
   * function name(var1,var2,...) {}
   * \", \n, \t, \r, \', \&, \\
+  * with (object) { } changes default object for fields.
-==== Events, Error Handling and Popups ====
+==== Events, Error Handling & Popups ====
   *  try { throw "errname"; } catch(err) {}
   * onerror=handleErr; handleErr(msg,url,linenum)
@@ Line 65: / Line 66: @@
 ==== 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 html> var mycars=new Array("Saab","Volvo","BMW");</code>
+  * 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 html> function intSort (a, b){ return a - b;}</code>
+  * 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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