chapter 4 java script – part2
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Chapter 4Java Script – Part2
2
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)
3
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>
4
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)
5
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>
6
Document Object
Properties Images, links, anchors, forms, layers, applet, bgcolor,
text, background, link, alink,vlink etcex. Window.document.bgcolor
Methods write(), writeln(), open(), close() ex. window.document.open()
7
Images Object
Images is an array object Properties
length, hspace, vspace, height, width, border etcex. window.document.images.length
Methods No methods
8
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
9
Anchors Object
The JavaScript anchor object describes a links destination or target.
Anchor is an array object Properties
name, text etc Methods
No methods
10
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.
11
Forms Object(Cont..) Form Objects
Button, text, password, file upload, radio, check box, text area, reset, select, submit etc.
Form Object Methods reset(), submit()
Events onReset, onSubmit
12
Text Object
Properties Name, value, size, maxlength, readonly etc.
Methods focus(), blur(), select()
Events onFocus, onBlur, onSelect, onChange
Password Object same as Text Object
13
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
14
Radio Object Properties
Name, value, check, length etc. Methods
focus(), blur() Events
onFocus, onBlur, onClick
Checkbox Object same as Radio Object
15
Select Object Properties
Name, size, multiple, selectedIndex, options, length etc.
Methods focus(), blur(), select()
Events onFocus, onBlur, onClick, onChange
16
Textarea Object Properties
rows, cols, name, value etc. Methods
focus(), blur() Events
onFocus, onBlur, onSelectex. window.document.formname.textarea.value
17
File Object Properties
name, value, size etc. Methods
focus(), blur() Events
onFocus, onBlurex. window.document.formname.filename.value
18
External ObjectsString, 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
19
Array Object Properties
index, input, length etc. Methods
pop(), push(), shift(), unshift(), concat(), chop(), splice() etc
20
Date Object Properties
No properties. Methods
getDate(), getDay(), getMonth(), getYear(), getMinutes(), getSeconds(), getTime() etc
21
Math Object Methods
sin(), cos(), tan(), round(), floor(), sqrt() etc
Navigator Object Properties
appName, appVersion, appCodeName etc
22
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 etcex. Window.framename.document.formname.text.value
Methods blur(), focus() etc
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