value JavaScript (JS) Example: HTML DOM Objects – Button Object – value JavaScript (JS) Example
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value JavaScript (JS) Example: HTML DOM Objects – Button Object – value JavaScript (JS) Example
Purpose: – Illustrates the JavaScript syntax for the Button Object value Property .
Prerequistes:
- Install Visual Web Developer 2008
Syntax: ButtonObject.value="texttodisplay" – Allows you to access the text to display on button.
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 language
- 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 "DOMButton"
- Right-click folder named "HTMLDOMObjects" in solution explorer;
- add new folder;
- name of folder should be: DOMButton
- Add New subfolder to "DOMButton" subfolder named "ButtonObjectProperties"
- Right-click subfolder named "DOMButton" in solution explorer;
- add new folder;
- name of folder should be: ButtonObjectProperties
- Add HTML Page Named value to ButtonObjectProperties subfolder
- Right-click ButtonObjectProperties subfolder;
- add new item;
- Select HTML Page
- HTML Page name should be value
- Click on copy code in code below to copy code into HTML Page value.htm
- Right-click on HTML page value.htm and select view in browser
| HTML | | copy code | | ? |
< !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: value </title> |
<!-- |
*************************************************** |
* This example is from http://idealprogrammer.com * |
*************************************************** |
--> |
<style type="text/css" id="myStyle"> |
.myButtons |
{ |
font-size:large; |
color:red; |
} |
.myButtons input |
{ |
color:Blue |
} |
.myButton2 |
{ |
font-size:xx-small; |
} |
.myButton2 input |
{ |
font-style :italic; |
} |
.myButton3 |
{ |
background-color:#d0e4fe; |
} |
.myButton3 input |
{ |
font-weight:600 |
} |
</style> |
<script type="text/javascript"> |
//**************************************************************** |
// Set Cookie |
//**************************************************************** |
function Set_Cookie( name, value, expires, path, domain, secure ) |
{ |
// set time, it's in milliseconds |
var today = new Date(); |
today.setTime( today.getTime() ); |
/* |
if the expires variable is set, make the correct |
expires time, the current script below will set |
it for x number of days, to make it for hours, |
delete * 24, for minutes, delete * 60 * 24 |
*/ |
if ( expires ) |
{ |
expires = expires * 1000 * 60 * 60 * 24; |
} |
var expires_date = new Date( today.getTime() + (expires) ); |
document.cookie = name + "=" +escape( value ) + |
( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + |
( ( path ) ? ";path=" + path : "" ) + |
( ( domain ) ? ";domain=" + domain : "" ) + |
( ( secure ) ? ";secure" : "" ); |
} |
//**************************************************************** |
// Get Cookie |
//**************************************************************** |
// this fixes an issue with the old method, ambiguous values |
// with this test document.cookie.indexOf( name + "=" ); |
function Get_Cookie(check_name) { |
// first we'll split this cookie up into name/value pairs |
// note: document.cookie only returns name=value, not the other components |
var a_all_cookies = document.cookie.split(';'); |
var a_temp_cookie = ''; |
var cookie_name = ''; |
var cookie_value = ''; |
var b_cookie_found = false; // set boolean t/f default f |
for (i = 0; i < a_all_cookies.length; i++) { |
// now we'll split apart each name=value pair |
a_temp_cookie = a_all_cookies[i].split('='); |
// and trim left/right whitespace while we're at it |
cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, ''); |
// if the extracted name matches passed check_name |
if (cookie_name == check_name) { |
b_cookie_found = true; |
// we need to handle case where cookie has no value but exists (no = sign, that is): |
if (a_temp_cookie.length > 1) { |
cookie_value = unescape(a_temp_cookie[1].replace(/^\s+|\s+$/g, '')); |
} |
// note that in cases where cookie is initialized but no value, null is returned |
return cookie_value; |
break; |
} |
a_temp_cookie = null; |
cookie_name = ''; |
} |
if (!b_cookie_found) { |
return null; |
} |
} |
</script> |
</head> |
<body id="myBodyID"> |
<div style="background-color:Yellow;border-color:black;border-style:solid;border-width:1px;"> click Buttons to change value of button object:</div><br /><br /> |
<!--using onclick to set a cookie and reload page; |
when page is reloading, we check that cookie to assign different styles to body |
--> |
<input id="Button1" type="button" class="myButtons" value="button1 - value=button1" onclick="javascript: Set_Cookie( 'mycookie', '1', 30, '/', '', '' ); window.location.reload();" /><br /><br /> |
<input id="Button2" type="button" class="myButtons" value="button2 - value=button2" onclick="javascript: Set_Cookie( 'mycookie', '2', 30, '/', '', '' ); window.location.reload();"/><br /><br /> |
<input id="Button3" type="button" class="myButtons" value="button3 - value=button3" onclick="javascript: Set_Cookie( 'mycookie', '3', 30, '/', '', '' ); window.location.reload();"/><br /><br /> |
<script type="text/javascript"> |
//***************************************************** |
// DOM Objects |
//***************************************************** |
//***************************************************** |
// *** Button Object Properties *** |
//***************************************************** |
//***************************************************** |
// value |
//***************************************************** |
// SYNTAX: |
// object.value="value" Allows you to retrieve or assign value for the text displayed for a button |
// Two ways to retrieve value |
document.write("<div style=\"border-style:solid\"><strong>Demonstrating Two Ways to Retrieve Property for Button1</strong><br />") |
// 1. GetElementsByTagName |
myObject=document.getElementsByTagName('input')[0]; |
document.write("Using getElementsByTagName: " + myObject.value); |
document.write("<br />"); |
// 2. GetElementById |
document.write("Using getElementById: "); |
document.write(document.getElementById('Button1').value); |
document.write("</div><br />"); |
document.write("<br />"); |
// Two ways to assign value |
if (Get_Cookie('mycookie')) { |
ButtonNum = (Get_Cookie('mycookie')); |
} |
else { |
ButtonNum = '1'; |
} |
// 1. GetElementById |
if (ButtonNum == '2') { |
document.write("<div style=\"border-style:solid\"><strong>Demonstrating Assigning Property with GetById for Button2</strong><br />") |
document.getElementById('Button2').value = "button2 - value=newButton2" |
document.getElementById('Button2').className = "myButton2" |
document.write("Button2 value changed to value=newButton2: " + document.getElementById('Button2').value + "</div><br />"); |
} |
// 2. GetElementsByTagName |
if (ButtonNum == '3') { |
document.write("<div style=\"border-style:solid\"><strong>Demonstrating Assigning Property with GetElementsByTagName for Button3</strong><br />") |
myThirdButton = document.getElementsByTagName('input')[2]; |
myThirdButton.className = "myButton3" |
myThirdButton.value = "button3 - value=newButton3" |
document.write("Button3 value changed to value=newButton3: " + myThirdButton.value + "</div>"); |
} |
</script> |
</body> |
</html> |
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