javascript2
Chapter 4
Java Script –
Part2
Location object
Properties
href – whole path will be displayed. ex: window.location.href ( see example 11)
protocol – protocol will be returned pathname – display path without protocol search – after ? In location bar what ever the command lines are passed that are displayed.
Methods
replace() – to replace with new file reload() – to reload a file ex: window.location.replace(“1.html”) ( see example 12)
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Example 11.html
<HTML>
<HEAD>
<TITLE>JavaScript</TITLE>
<script type="text/javascript"> var loc = window.location.href; document.write("Path=" +loc);
</script>
</HEAD>
<BODY >
</BODY>
</HTML>
3
History object
Properties
Length – to find the number of files in a history. ex: window.history.length ( see example 13)
Current – path of current file
Previous – path of previous file
Next – path of next file
Methods
Back() – one file back
Forward() – one file forward
Go() – move multiple file ex: window.history.go(-2)
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Example - 13.Html
<HTML>
<HEAD>
<TITLE>Functions JavaScript</TITLE>
<script type="text/javascript"> var numberofvisited = window.history.length; document.write("The number of pages visited in this window is" +numberofvisited+ " pages."+"<br>");
</script>
</HEAD>
<BODY >
</BODY>
</HTML>
5
Document Object
Properties
Images, links, anchors, forms, layers, applet, bgcolor, text, background, link, alink,vlink etc ex. Window.document.bgcolor
Methods
write(), writeln(), open(), close() ex. window.document.open()
6
Images Object
Images is an array object
Properties
length, hspace, vspace, height, width, border etc ex. window.document.images.length
Methods
No methods
7
Links Object
Links is an array object
The Link object corresponds to a hypertext link
Properties
length, href, protocol, pathname, search etc ex. window.document.links.length
Methods
No methods
8
Anchors Object
The JavaScript anchor object describes a links destination or target.
Anchor is an array object
Properties
name, text etc
Methods
No methods
9
Forms Object
Forms is an array object
Properties
action - This specifies the URL and CGI script file name the form is to be submitted to.
elements - An array of fields and elements in the form .
encoding - It specifies the encoding method the form data is encoded in before being submitted to the server. It corresponds to the ENCTYPE attribute of the FORM tag. The default is
"application/x-www-form-urlencoded". Other encoding includes text/plain or multipart/form-data.
length - The number of fields in the elements array. I.E. the length of the elements array method - This is a read or write string. It has the value "GET" or
"POST".
name - The form name. Corresponds to the FORM Name attribute.
target - The name of the frame or window the form submission response is sent to by the server.
10
(Cont..) Forms Object
Form Objects
Button, text, password, file upload, radio, check box, text area, reset, select, submit etc.
Form Object Methods
reset(), submit()
Events
onReset, onSubmit
11
Text Object
Properties
Name, value, size, maxlength, readonly etc.
Methods
focus(), blur(), select()
Events
onFocus, onBlur, onSelect, onChange
Password Object same as Text Object
12
Button, Submit, Reset Object
Properties
Name, value etc.
Methods
focus(), blur()
Events
onFocus, onBlur, onClick, onMouseOver, onMouseOut
For checking the validations use an ordinary button and call a function.
For submitting the form data use the submit button
13
Radio Object
Properties
Name, value, check, length etc.
Methods
focus(), blur()
Events
onFocus, onBlur, onClick
Checkbox Object same as Radio Object
14
Select Object
Properties
Name, size, multiple, selectedIndex, options, length etc.
Methods
focus(), blur(), select()
Events
onFocus, onBlur, onClick, onChange
15
Textarea Object
Properties
rows, cols, name, value etc.
Methods
focus(), blur()
Events
onFocus, onBlur, onSelect ex. window.document.formname.textarea.value
16
File Object
Properties
name, value, size etc.
Methods
focus(), blur()
Events
onFocus, onBlur ex. window.document.formname.filename.value
17
External Objects
String, Array, Date, Math, Navigator
String Object
Properties
length etc.
Methods
concat(), substr(), indexOf(), lastIndexOf(), reverse(), charAt(), split(), blink(), italic(), big(), small(), bold(), fontColor(), fontSize(), toUpperCase(), toLowerCase() etc
18
Array Object
Properties
index, input, length etc.
Methods
pop(), push(), shift(), unshift(), concat(), chop(), splice() etc
19
Date Object
Properties
No properties.
Methods
getDate(), getDay(), getMonth(), getYear(), getMinutes(), getSeconds(), getTime() etc
20
Math Object
Methods
sin(), cos(), tan(), round(), floor(), sqrt() etc
Navigator Object
Properties
appName, appVersion, appCodeName etc
21
Frames Object
Frames is an array object (The Array object is used to store multiple values in a single variable)
Using the frames we can access a document object, history object, location object.
Properties
src, name, cols, rows, border, scrolling, document, location, history etc ex. Window.framename.document.formname.text.value
Methods blur(), focus() etc
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