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--- docs:programming:javascript:javascript_notes [2007/03/13 17:02] – billh
+++ docs:programming:javascript:javascript_notes [2008/08/03 00:25] (current) – external edit 127.0.0.1
@@ Line 32: / Line 32: @@
   * IE uses document.all("elemID")
   * Older Netscape browsers used document.layers[elemID]
-  * A utility function to get the proper element reference, regardless of browser:<code html>
+  * A utility function to get the proper element reference, regardless of browser:<code javascript>
 function getElem(elemID){
 	if(document.all){
@@ Line 51: / Line 51: @@
 ===== Commenting =====
-<code html>
+<code javascript>
 <SCRIPT language="JavaScript">
@@ Line 70: / Line 70: @@
 </code>
+===== Linking to an external script file =====
+<code javascript>
+// in the <head> section of an html page
+<script type="JavaScript" src="scriptFilename.js"></script>
+</code>
+===== Testing for existence of a property or method =====
+<code javascript>
+if(elem && typeof elem.property != "undefined"){
+  // element property is valid - it is safe to use this property
+}
+if(elem && typeof elem.method != "undefined"){
+  // element method is valid - it is safe to call this method
+}
+</code>