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Client-Side Web Application Development with Java

Client-Side Web Application Development with Java. ISYS 350. Types of Web pages. Static page: The contents of a web page is predefined by HTML tags and other mark up languages. Example: david chao’s home page. Dynamic page

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Client-Side Web Application Development with Java

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  1. Client-Side Web Application Development with Java ISYS 350

  2. Types of Web pages • Static page: • The contents of a web page is predefined by HTML tags and other mark up languages. • Example: david chao’s home page. • Dynamic page • A web page includes contents produced by a programming language when the page is opened. • Examples: • Pages that display current date/time, visitor counter • Yahoo home page • Pages that display results based on a database query. • Yahoo’s Finance/Enter symbol/Historical prices

  3. Technologies for Creating Dynamic Pages • Client-side technology • HTML, Document Object Model (DOM), JavaScript • Server-side technology • Microsoft .Net • PHP • Java • Others

  4. Example of Client-side Page using HTML, DOM and JavaScript

  5. HTML Introductionhttp://www.w3schools.com/default.asp • Heading section • <head>, <title>, <meta>, <script>, etc. • Body section • <body>, <p>, <h1> to <h6>, <a>, <br> • Formatting: <b>, <I>, <u>, <center> • Comment: <!-- comment --> • List <ul> • Image • Table: <table>, <tr>: a new row in table, <td>: a new cell in a table row. • Form: <form>, <input>, <select>, <textarea>

  6. TABLE Tag <table border="1" width="100%"> <tr> <td width="25%"></td> <td width="25%">&nbsp;</td> <td width="25%">&nbsp;</td> <td width="25%">&nbsp;</td> </tr> <tr> <td width="25%">&nbsp;</td> <td width="25%">&nbsp;</td> <td width="25%">&nbsp;</td> <td width="25%">&nbsp;</td> </tr> </table>

  7. FORM Tag • Form attribute: • Action: Specify the URL of a program on a server or an email address to which a form’s data will be submitted. • Method: • Get: the form’s data is appended to the URL specified by the Action attribute as a QueryString. • Post: A preferred method for database processing. Form’s data is sent in the HTTP body. • Name: Form’s name

  8. QueryString • A QueryString is a set of name=value pairs appended to a target URL. • It can be used to pass information from one webpage to another. • To create a QueryString: • Add a question mark (?) immediately after a URL. • Followed by name=value pairs separated by ampersands (&). • Example: • <A Href=“http://my.com/Target.htm?CustID=C1&Cname=Chao”>

  9. NetBeans IDE • A free, open-source Integrated Development Environment for software developers. You get all the tools you need to create professional desktop, enterprise, web, and mobile applications. • Support many languages: • Java, PHP, C++, Ruby • Support many platforms: • Windows, Linux, Mac OS X and Solaris

  10. Creating a New Web Project • File/New Project/Java Web • Web Application • Folders of a web project: • Web • Src

  11. Create a Form • Right Click Project’s Web folder and choose: • New/HTML • Window/Palette to access the HTML support • From HTML Palette: • Drag Form and drop it between Body tag • Add Text input • Add Button • Note: Use <p></P> to start a new line or use Table to align controls.

  12. Dropdown List Example <select name="Rate"> <option value=.04>4%</option> <option value=045>4.5%</option> <option value=.05 >5%</option> <option value=.055>5.5%</option> <option value=.06>6%</option> </select>

  13. RadioButton Example:RadioButtons having the same name belong to one group <p> <input type="radio" name="Term" value="10" /> 10-year</p> <p> <input type="radio" name="Term" value="15" /> 15-year</p> <p><input type="radio" name="Term" value="30" /> 30-year</p>

  14. Client Side Script • <script type="text/javascript"> • </script>

  15. HTML Tags and Events • Link <a> </a>: click, mouseOver, mouseOut • Image <img>: abort(loading is interrupted), error, load. • Area <area>: mouseOver, mouseOut • Body <body>: blur, error, focus, load, unload • Frameset: blur, error, focus, load, unload • Frame: blur, focus • Form: submit, reset • Textbox, Text area: blur, focus, change, select • Button, Radio button, check box: click • List: blur, focus, change

  16. Event Handler • Event handler name: on + event name • Ex. onClick • Calling a handler: • onClick="CompSumJS()“ • onClick="window.alert('you click me')" • Note: single quote/double quote

  17. Example <form method="POST" name="testForm" action=""> <p>Value1: <input type="text" name="num1" size="20"></p> <p>Value2: <input type="text" name="num2" size="20"></p> <p>Sum: <input type="text" name="valueSum" size="20"></p> <p><input type="button" value="ComputeSum" name="btnCompute" onClick="ComputeSum()"></p> </form>

  18. Document Object Model

  19. Window Object • The Window object represents a Web browser window. • Properties: • window.status, window.defaultstatus • window.document, window.history, window.location. • Window.name • Methods: • window.open (“url”, “name”, Options) • Options: menubar=no, status=no, toolbar=no, etc. • window.close • window.alert(“string”) • window.prompt(“string”) • Window.focus • Etc.

  20. Navigator Object • The navigator object provides information about the browser. • Properties: • Navigator.appName:browser name • Navigator.appCodeName: browser code name • Navigator.appVersion • Navigator.platform: the operating system in use.

  21. Location Object • Allows you to change to a new web page from within a script code. • Properties: • Host, hostname, pathname • Href: full URL address • Search: A URL’s queryString • Methods: • location.reload() • To open a page: location.href = “URL”

  22. Testing Location Object <html> <script type="text/javascript"> function openNew(){ site=window.prompt("enter url:"); window.open (site); location.href=“FVForm.htm"; } </script><head> <body> <p><input type="button" value="Button" name="B3" onclick="openNew()"></p> </body></html>

  23. History Object • Maintain a history list of all the documents that have been opened during current session. • Methods: • history.back() • history.forward() • history.go(): ex. History.go(-2) • Demo: testDocOpenClose.htm

  24. Document Object • The document object represents the actual web page within the window. • Properties: • background, bgColor, fgColor, title, url, lastModified, domain, referrer, cookie, linkColor, etc. • Ex. document.bgColor=“silver”; • Methods: • Document.write (“string”) • Document.open, close

  25. Accessing data entered on a form • Textbox: • document.LoanForm.Loan.value • Dropdown list: • document.LoanForm.Rate.options[document.LoanForm.Rate.selectedIndex].value) • Radiobuttons: • document.LoanForm.Term[0].checked • checkBox: • document.LoanForm.checkBox1.checked

  26. JavaScript Variable Declaration • var intrate, term, amount; • Data Type: • Variant - a variable’s data type is determined when it is initialized to its first value. • Variable scope: • Local: Variables declared in a function or procedure. • Global: Variables declared in the heading section, but not in a function or procedure. • Variable name is case-sensitive.

  27. Statements • Statements: • End with “;” • Block of code: { } • Comments: • Single-line comment: //comment • Block comment: • /* comment comment */

  28. Arrays • var arrayName = new Array(array size); • var Pet = new Array(2); • Pet[0]=“dog”; • Pet[1]=“cat”; • Pet[2]=“bird”;

  29. Operators • Arithmetic operators: +, -, *, /, Math.pow(x,y), etc. • Math is an object with many methods such as round(x), random(), sqrt(x), ceil(x), floor(x), etc. • Comparison operators: = = , !=, <, >, <=, >= • Logical operators: &&, ||, !

  30. Formula to Expression

  31. IF Statements JS: if (condition) { statements; } else { statements; } if (document.LoanForm.Term[0].checked) {myTerm=10;} else if (document.LoanForm.Term[1].checked) {myTerm=15;} else {myTerm=30;}

  32. Switch Case Statements switch(varable name) { case value1: statements; break; case value2: statements; break; … default: statements; break; }

  33. Loop Structures 1. while (condition) { statements; } 2. for (var I = 0; I<5;I=I+1){ statements; } Note: Use Break statement to exit loop earlier. Ex. Break ;

  34. JavaScript’s Conversion Functions • toString() example: • Price=5; • Qty=10; • Amount=Price*Qty; • Document.write (Amount.toString()); • eval • strVar = “5”; • numVar = eval(strVar)

  35. JavaScript Functions • Defining functions • function functionName(arg1,..,argN){ • Statements; • return return value; • } Note: 1. The arguments are optional. 2. The return statement is optional. A JavaScript function is not required to return a value.

  36. Example: JavaScript to Compute the sum of two values <script language=javascript type="text/javascript"> <!-- function ComputeSum(){ n1=document.testForm.num1.value; n2=document.testForm.num2.value; document.testForm.valueSum.value=eval(n1)+eval(n2); } --> </script>

  37. JavaScript to compute the future value

  38. Form <form name="fvForm" action=""> <p>Enter Present Value: <input type="text" name="PV" value="" /></p> <p>Select interest rate:<select name="Rate"> <option value=.04>4%</option> <option value=045>4.5%</option> <option value=.05 >5%</option> <option value=.055>5.5%</option> <option value=.06>6%</option> <option value=.065>6.5%</option> <option value=.07>7%</option> </select> <p>Select year:</p> <p> <input type="radio" name="Year" value="10" /> 10-year</p> <p> <input type="radio" name="Year" value="15" /> 15-year</p> <p><input type="radio" name="Year" value="30" /> 30-year</p> <p>Future value is:<input type="text" name="FV" value="" /></p> <input type="button" value="ComputeFV" name="btnCompute" onClick="ComputeFV()"/> </form>

  39. Code Example <script type="text/javascript"> <!-- function ComputeFV(){ myPV=eval(document.fvForm.PV.value); myRate=eval(document.fvForm.Rate.options[document.fvForm.Rate.selectedIndex].value); if (document.fvForm.Year[0].checked) {myYear=10;} else if (document.fvForm.Year[1].checked) {myYear=15;} else {myYear=30;} fv=myPV*Math.pow(1+myRate,myYear); document.fvForm.FV.value=fv.toString(); } --> </script>

  40. Years to Reach Goal

  41. Code Example <script type="text/javascript"> <!-- function ComputeJS(){ pv=eval(document.testForm.txtPv.value); rate=eval(document.testForm.txtRate.value); goal=eval(document.testForm.txtGoal.value); fv=0; for (i=1; i<=9999; ++i){ fv=pv*Math.pow(1+rate,i); if(fv>=goal){ document.testForm.yearNeeded.value=i; break; } } } --> </script>

  42. Validating Data: The two boxes cannot be blank <script type="text/javascript"> <!-- function Validating(){ var Valid; Valid=true; if (document.ValidForm.Loan.value=="" ||document.ValidForm.Rate.value==""){Valid=false;} if (Valid==false){alert("Cannot contain blank");} else {document.ValidForm.submit();} } --> </script>

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