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Applied Component I Unit II Introduction of java-script
Java-script in web browser Forms and form elements String manipulation WE-IT TUTORIALS /55
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1.Introduction to java-script
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1.Introduction to java-script
Java-script is a powerful client level scripting languages Java-script is not java Java-script is a best supported scripting language for many browsers It can be written inside <script> tag or in file with extension .js JavaScript is usually embedded directly into HTML pages JavaScript is Case Sensitive WE-IT TUTORIALS /55
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How to write java-script
<html> <head> <script language="javascript"> function call() { alert("do u have any problem! hold on"); alert("lets start learning java-script"); } </script> </head> <body> <input type="button" value="simple button" onclick="call()"> </body> </html> WE-IT TUTORIALS /55
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2.Client side java script
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math objects string objects
The main purpose of String Object in JavaScript is for storing text. math objects The main purpose of math object in javaScript is to perform math operation like sin,cos,tan operations WE-IT TUTORIALS /55
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Date object array object It is a array handler in javascript
It gives access to date method, for displaying and setting date WE-IT TUTORIALS /55
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Java script in web browser
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window Object The window object represents the browser’s frame or window, in which your web page is contained via the properties of the window object you can find out what browser is running, the pages the user has visited, the size of the browser window, the size of the user’s screen The window object is a global object, which means you don’t need to use its name to access its properties and methods window.alert(“Hello class!”); Window.defaultStatus = “see your status bar” WE-IT TUTORIALS /55
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history Object The history object keeps track of each page that the user visits This list of pages is commonly called the history stack for the browser It enables the user to click the browser’s Back and Forward buttons to revisit pages the history object has the back() and forward() methods. The history object also has the go() method. WE-IT TUTORIALS /55
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history.back(); history.forward(); history.go(-3); history.go(3);
one page back history.forward(); One page forward history.go(-3); three page back history.go(3); Three page forward WE-IT TUTORIALS /55
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location Object The location object contains lots of potentially useful information about the current page’s location. it contain the URL (Uniform Resource Locator) for the page server hosting port number of the server connection the protocol used WE-IT TUTORIALS /55
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Navigate using location object
You can navigate to another page in two ways location object’s href property location object’s replace() method replace() method removes the current page from the history stack and replaces it with the new page href property simply adds the new page to the top of the history stack WE-IT TUTORIALS /55
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Navigator object navigator object contains lots of information about the browser and the operating system in which it’s running. WE-IT TUTORIALS /55
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document Object—The Page Itself
The document object has a number of properties associated with it, which are also arrays. The main ones are the forms, images, and links arrays. document.bgColor=“green”; document.images.length This will return how many image are on web page document.images[“image1”]. It is the array of images of name “image1” WE-IT TUTORIALS /55
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Events and event handling
Basic html event onclick=”alert(‘You Clicked?’)” Onload=“” Onunload=“” window.document.links["anc1"].onclick = linkclick; Special event handler has to be load after full html page is cached WE-IT TUTORIALS /55
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3.Forms and form elements
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Forms and form elements
document.forms.length; Returns count of form tags on document Document.form1.button1.value=“hello”; Changes the value of button1 document.form1.txt1.focus(); Takes focus on txt1(textbox) document.form1.txt1.select(); Selects all text in txt1(textbox) WE-IT TUTORIALS /55
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Windows and frames var newWindow = window.open(myURL,”myWindow”,”width= 125,height=150,resizable”); newWindow.resizeTo(350,200); resize your window to 350 pixels wide by 200 pixels newWindow.moveTo(100,400); move it so it’s 100 pixels from the left of the screen and 400 pixels from the top WE-IT TUTORIALS /55
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newWindow.resizeBy(100,200);
increase the size of newWindow by 100 pixels horizontally and 200 pixels vertically newWindow.moveBy(20,50); move the newWindow by 20 pixels horizontally and 50 pixels vertically WE-IT TUTORIALS /55
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Dynamic html DHTML is the manipulation of an HTML document after it is loaded into the browser, and the most common way to manipulate the document is by changing the way HTML elements look WE-IT TUTORIALS /55
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Accessing Elements The Document Object Model (DOM) holds the ability you need to find and access HTML elements; the DOM is a hierarchical tree, and you can certainly climb it, inspect every branch and leaf, and find what you’re looking for document.getElementById(“divAdvert”) WE-IT TUTORIALS /55
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Changing Appearances document.getElementById(“divAdvert”).st yle.color = “red” WE-IT TUTORIALS /55
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Positioning and Moving Content
document.getElementById("div1").style.lef t = "100px"; document.getElementById("div1").style.to p = "200px"; WE-IT TUTORIALS /55
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4.String manipulation WE-IT TUTORIALS /55
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Additional String Methods
split() Method var myString = “A,B,C”; var myTextArray = myString.split(‘,’); replace() Method var myString = “The event will be in May, the 21st of June”; myCleanedUpString = myString.replace(“May”,”June”); WE-IT TUTORIALS /55
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search() Method var myString = “Beginning JavaScript, Beginning Java, Professional JavaScript”; alert(myString.search(“Java”)); alert box that occurs will show the value 10, which is the character position of the J in the first occurrence of Java WE-IT TUTORIALS /55
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match() Method var myString = “1997, 1998, 1999, 2000, 2000, 2001, 2002”; myMatchArray = myString.match(“2000”); alert(myMatchArray.length); instead of returning the position at which a match was found, it returns an array. WE-IT TUTORIALS /55
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Regular expression A regular expression is an object that describes a pattern of characters. Regular expressions are used to perform pattern-matching and "search-and- replace" functions on text. syntax var txt=/pattern/modifiers; var txt=new RegExp(pattern,modifiers); WE-IT TUTORIALS /55
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modifiers WE-IT TUTORIALS /55
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