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--- notes:javascript_cheat_sheet [2026/09/15 01:54]
146.75.128.123 old revision restored (2026/08/03 09:41)
+++ notes:javascript_cheat_sheet [2026/09/16 07:48] (current)
5.107.213.231 old revision restored (2026/08/03 07:06)
@@ Line 47: / Line 47: @@
   * 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 66: / 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).
@@ Line 90: / Line 114: @@
   * 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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