JavaScript (JS) coords Example: HTML DOM Objects – Area Object – JavaScript (JS) coords Example
JavaScript (JS) coords Example: HTML DOM Objects – Area Object – JavaScript (JS) coords Example
Purpose: – Illustrates the JavaScript syntax for the Area Object coords Property .
Prerequistes:
- Install Visual Web Developer 2008
Syntax: AreaObject.coords=”coordinates of shape” – Allows you to access coordinates of an AreaObject
Restrictions: None
Notes:
- You can build your own library of syntax examples by using same web site over and over and just add new files to it.
Instructions:
- Use Visual Web Developer 2008
- Create new web site;
- Click File/New Web Site
- Select ASP.NET Website Template
- Select C-Sharp for hrefuage
- name of Web Site could be JavaScript_Syntax.
- Add New folder named “HTMLDOMObjects”
- Right-click project name in solution explorer;
- add new folder;
- name of folder should be: HTMLDOMObjects
- Add New subfolder to “HTMLDOMObjects” folder named “DOMArea”
- Right-click folder named “HTMLDOMObjects” in solution explorer;
- add new folder;
- name of folder should be: DOMArea
- Add New subfolder to “DOMArea” subfolder named “AreaObjectProperties”
- Right-click subfolder named “DOMArea” in solution explorer;
- add new folder;
- name of folder should be: AreaObjectProperties
- Add HTML Page Named coords to AreaObjectProperties subfolder
- Right-click AreaObjectProperties subfolder;
- add new item;
- Select HTML Page
- HTML Page name should be coords
- Click on copy code in code below to copy code into HTML Page coords.htm
- Right-click on HTML page coords.htm and select view in browser
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>IdealProgrammer.com: coords</title>
<!--
***************************************************
* This example is from http://idealprogrammer.com *
***************************************************
Note:
coords for rect = "upperleftx,upperlefty,bottomrightx,bottomrighty"
coords for circle = x,y,r where x and y are center and r is radius
coords for poly = x1,y1,x2,y2,...
-->
</head>
<body>
<a href="http://idealprogrammer.com">Ideal Programmer</a><br /><br />
<img src ="http://idealprogrammer.com/wp-photos/goldbottle.jpg" width="200" height="200" alt="Planets"
usemap ="#goldmap" /><br /> <br />
<map name="goldmap" id="goldmapid">
<area id="Area1" shape="rect" coords="0,0,100,100" href="http://www.google.com" alt="google" accesskey="1" />
<area id="Area2" shape="rect" coords="100,0,200,100" href="http://www.yahoo.com" alt="yahoo" accesskey="2" />
<area id="Area3" shape="rect" coords="0,100,100,200" href="http://idealprogrammer.com" alt="idealprogrammer" accesskey="3" />
<area id="Area4" shape="rect" coords="100,100,200,200" href="http://progressmonitor.com" alt="progressmonitor" accesskey="4" />
</map>
<script type="text/javascript">
//*****************************************************
// DOM Objects
//*****************************************************
//*****************************************************
// *** Area Object Property ***
//*****************************************************
//*****************************************************
// coords
//*****************************************************
// SYNTAX:
// areaObject.coords=coordinates Allows you to access a comma-separated list
// of a areaObject in an image map.
// Two ways to retrieve coords
// 1. GetElementsByTagName
myObject = document.getElementsByTagName('area')[0];
document.write("Area1 - Using getElementsByTagName : " + myObject.coords);
document.write("<br />");
// 2. GetElementById
document.write("Area2 - Using getElementById: ");
document.write(document.getElementById('Area2').coords);
document.write("<br /><br />");
// Two ways to assign coords
// 1. GetElementById
myArea3 = document.getElementById('Area3');
myArea3.coords = "0,99,100,200";
document.write("<br />Area3 changed to 0,99,100,200: ", myArea3.coords);
// 2. GetElementsByTagName
myArea4 = document.getElementsByTagName('area')[3];
myArea4.coords = "100,100,199,199";
document.write("<br />Area4 changed to 100,100,199,199: ", myArea4.coords)
</script>
</body>
</html> |
