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PHP class notes-unit 5, Lecture notes of Programming Languages

Bharathidasan UniversityProgramming Languages

PHP class notes-unit 5 syllabus: AJAX - Advanced AJAX.

Typology: Lecture notes

2018/2019

Uploaded on 08/12/2019

krishnavalli-singaravelan
krishnavalli-singaravelan 🇮🇳

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Contents
AJAX..................................................................................................................................................... 1
AJAX with PHP..................................................................................................................................................... 3
Passing data to server with GET............................................................................................................................... 3
Passing data to the Server with Post..........................................................................................................................3
Handling XML..................................................................................................................................................... 5
Handling XML with PHP..........................................................................................................................................8
ADVANCED AJAX..................................................................................................................................................... 10
Handling Concurrent AJAX Request...................................................................................................................... 10
Downloading image in AJAX..................................................................................................................................... 12
Downloading JavaScript with AJAX...........................................................................................................................12
Connecting to Google Suggest [Real Time Application with AJAX].....................................................................13
Connecting to other domain using AJAX................................................................................................................15
Logging in with AJAX & PHP....................................................................................................................................15
Getting Data with Head Requests and AJAX..........................................................................................................16
DRAWING IMAGES ON THE SERVER...................................................................................................................... 17
Creating an Image..................................................................................................................................................... 18
Destroying Image Files................................................................................................................................................18
Displaying Images in HTML Pages........................................................................................................................ 19
Drawing Lines..................................................................................................................................................... 19
Setting Line Thickness............................................................................................................................................ 20
Drawing Rectangles.....................................................................................................................................................20
Drawing ellipses..................................................................................................................................................... 20
Drawing ARCS..................................................................................................................................................... 21
Drawing Polygons..................................................................................................................................................... 21
Filling in figures..................................................................................................................................................... 22
Drawing Individual Pixels...........................................................................................................................................22
Drawing Text..................................................................................................................................................... 22
Drawing Vertical Text..................................................................................................................................................23
Working with Image Files...........................................................................................................................................23
Tilling Images..................................................................................................................................................... 25
Copying Images..................................................................................................................................................... 25
UNIT 5
UNIT 5 | Page 1
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Download PHP class notes-unit 5 and more Lecture notes Programming Languages in PDF only on Docsity!

Contents

  • AJAX.....................................................................................................................................................
    • AJAX with PHP.....................................................................................................................................................
      • Passing data to server with GET...............................................................................................................................
      • Passing data to the Server with Post..........................................................................................................................
    • Handling XML.....................................................................................................................................................
      • Handling XML with PHP..........................................................................................................................................
  • ADVANCED AJAX..................................................................................................................................................... - Handling Concurrent AJAX Request......................................................................................................................
    • Downloading image in AJAX.....................................................................................................................................
    • Downloading JavaScript with AJAX...........................................................................................................................
      • Connecting to Google Suggest [Real Time Application with AJAX].....................................................................
      • Connecting to other domain using AJAX................................................................................................................
    • Logging in with AJAX & PHP....................................................................................................................................
      • Getting Data with Head Requests and AJAX..........................................................................................................
  • DRAWING IMAGES ON THE SERVER......................................................................................................................
    • Creating an Image.....................................................................................................................................................
    • Destroying Image Files................................................................................................................................................
      • Displaying Images in HTML Pages........................................................................................................................
    • Drawing Lines.....................................................................................................................................................
      • Setting Line Thickness............................................................................................................................................
    • Drawing Rectangles.....................................................................................................................................................
    • Drawing ellipses.....................................................................................................................................................
    • Drawing ARCS.....................................................................................................................................................
    • Drawing Polygons.....................................................................................................................................................
    • Filling in figures.....................................................................................................................................................
    • Drawing Individual Pixels...........................................................................................................................................
    • Drawing Text.....................................................................................................................................................
    • Drawing Vertical Text..................................................................................................................................................
    • Working with Image Files...........................................................................................................................................
    • Tilling Images.....................................................................................................................................................
    • Copying Images.....................................................................................................................................................
  • UNIT

AJAX

  • AJAX stands for Asynchronous JAvascript Xml.
  • AJAX is the basics for Web 2.0.
  • Implementing AJAX will give a web application the look and feel of desktop application.
  • AJAX applications do not refresh the entire browser display every time the user does something.
  • AJAX can communicate with server download data and display the data in some part of the web page without having to reload the web page.
  • AJAX is implemented using Java Script and XML.
  • PHP is used with AJAX to communicate with the server.

Writing AJAX program: Program 5- Index.html An Ajax demo

Sending Ajax data with POST

_ _

The fetched message will appear here.

In the above program,

  • As the data’s are not sent through ?URL encoded moe, the coding for two buttons are written as follow: _
    <input type = “button” value = “Fetch message 1” onclick = “getData (‘choosem.php’, ‘targetDiv’, 1)”> <input type = “button” value = “Fetch message 2” onclick = “getData (‘choosem.php’,‘targetDiv’, 2)”>
_ - The data’s are sent to the getData function as its 3rd^ argument, - The getData function definition is changed to take 3 arguments - Set the method to open object to post. - Additional code is included to indicate to the server-side code that the data’s are encoded as POST encoding format through this line: _XMLHttpRequestObject.setRequestHeader (‘Content-Type’, ‘application/x- www- form-urlencoded’);_ - Finally the encoded data is sent to the server through the send method as follow: _Function getData (dataSource, divID, data) { If (XMLHttpRequestObject) {_

Soda Cheese Salami Store.html Using Ajax with XML

Using Ajax with XML



your selection will appear here.
In the above program,
  • The open function of XMLHttpRequestObject will have “products.php? Items = 1” as its target parameter.
  • A value of 1 for items will return the products1 entries and 2 will return the second list of products.

ADVANCED AJAX

  • AJAX accepts multiple XMLHttpRequest from client to server.
  • AJAX allows downloading from multiple servers.
  • JavaScript files can be downloaded through AJAX and can be executed from the browser.

if (XMLHttpRequestObjects[index].readyState == 4 && XMLHttpRequestObjects[index].status == 200) { var xmlDocument = XMLHttpRequestObjects[index].responseXML; products = xmlDocument.getElementsByTagName("item"); listproducts(); } } XMLHttpRequestObjects[index].send(null); } }

In the above code,

  • Each button uses separate object from the array. Solution 3: using JavaScript inner function.
  • An inner function is a function that’s contained inside another function. format: function Outer(data) { var var1 = data; function inner (var2) { alert (var1 + var2); } }
  • Every time there is a call to outer function, a new copy of that function is created, means a new value is stored as var1.
  • The inner function will have access to that value.
  • Similarly in each call, a new XML Http Request Objects is created and that object is available to any inner function.
  • Therefore, the code to create and fill the variable XML Http Request Objects is placed inside the function getproducts1 and getproducts2. Then when there is a call to the function, a new XML Http Request Object is created and the anonymous inner function will use the new object automatically.

Downloading image in AJAX.....................................................................................................................................

  • When downloading images, the name of the image is downloaded. To actually download the image, AJAX depends on Dynamic HTML in the browser.

Downloading JavaScript with AJAX...........................................................................................................................

  • When there is a request to external website, the return data can be in JavaScript.
  • Any kind of JavaScript can be sent back from the server to the AJAX-enabled JavaScript.
  • E.g.: Downloading JavaScript with Ajax