Mul$media im Netz (Online Mul$media) Wintersemester 2014/15. Übung 06 (Haup-ach)

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1 Mul$media im Netz (Online Mul$media) Wintersemester 2014/15 Übung 06 (Haup-ach) Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-1

2 Today s Agenda Flashback: 5 th Tutorial Announcements jquery: AJAX Code- A- Long: Filtering a Movie List Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-2

3 Flashback Explain a concept from last week s tutorial to your grandmother Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-3

4 Announcements Assignment 06 Assignment 06 is due in 2 weeks. Tutors will help you with your programming assignment next week and answer your ques6ons. Please review the learning material and your assignments. Prepare ques6ons, and send them to tobias.stockinger@ifi.lmu.de in advance. Evalua6on There is going to be a small evalua6on of the tutorials during the next two weeks. You benefit from your construc6ve feedback right away Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-4

Assignment Submissions 70 60 50 40 30 20 10 0 64 51

5 Assignment Submissions A01 A02 A03 A04 A05 HF NF Linear (HF) :50h Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-5

6 Challenge If more than 75 students (HF & NF) submit assignment 06, there will be a short mock exam prior to the final exam. hhps://openclipart.org/detail/168636/challenge- accepted- by- tavin Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-6

8 jquery Books Ruher, Jake. Smashing JQuery. John Wiley & Sons, Duckeh, Jon. JavaScript and JQuery: Interac6ve Front- End Web Development. John Wiley & Sons, (2014). Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-8

9 AJAX (ˈeɪdʒæks) Asynchrounous Javascript And XML Allows passing around data between client- and server- side applica6ons back and forth without refreshing the page AJAX requests (also: XHR = XML HhpRequest): GET: retrieve data no manipula6on on the server POST: retrieve and/or modify data Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-9

10 AJAX and jquery jquery offers methods for AJAX- requests: $.ajax() convenience methods: $.get(), $.post(), $.load()... Advantages: ease- of- use readability cross- browser compa6bility Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-10

11 Loading HTML Content HTML Content from the same site or server can be loaded into certain elements with $.load() Example function init(){ // this only works with local resources $("#container").load('bavariaipsum.html'); } $(document).ready(init); Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-11

12 Example: Loading an XML File $.ajax({ url : 'movies.xml', success : function(data){ // data = xml document $("body").append(data.childnodes); } }); $.ajax() documenta6on: hhps://api.jquery.com/jquery.ajax/ Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-12

13 Example: Loading an XML File $.ajax({ url : 'movies.xml', success : function(data){ // data = xml document $("body").append(data.childnodes); } }); Callback func6on. Once the data has been loaded, this func6on is called. It can take a while for this to be called why? $.ajax() documenta6on: hhps://api.jquery.com/jquery.ajax/ Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-13

14 Parameters: Example (I) <DOCTYPE html> <html> <head lang="en"> <meta charset="utf-8"> <title>api Test</title> <script src="jquery.js"></script> <script> // our code </script> </head> <body> <form id="contactform"> <label for="firstname">first Name:</label> <input type="text" id="firstname" name="firstname" /> <label for="lastname">last Name:</label> <input type="text" id="lastname" name="lastname" /> <input type="submit" value="submit"/> </form> <div id="result"> <-- all asynchronously loaded content will be put here --> </div> </body> </html> Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-14

15 Parameters: Example (II) <script> function init(){ function successcallback(data){ $("#result").html(data); } $("#contactform").submit(function(event){ event.preventdefault(); // if we don't do this, the page is actually var self = $(this); // this --> #contactform var firstname = self.find("#firstname").val(); var lastname = self.find("#lastname").val(); $.ajax({ url : 'apiscript.php', // the script we're calling type: 'POST', // the method we use data : { // the data we pass to the script firstname : firstname, lastname : lastname }, datatype : "text", // the expected response data type success : successcallback // what to do if we succeed }); }); } $(document).ready(init); </script> Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-15

16 PHP Script: apiscript.php <?php $firstname = $_POST['firstName']; $lastname = $_POST['lastName']; echo "First Name: $firstname <br />"; echo "Last Name: $lastname"; Ludwig- Maximilians- Universität München Mul6media im Netz WS 2012/13 - Übung 6-16

17 .serialize() <script> function init(){ function successcallback(data){ $("#result").html(data); } $("#contactform").submit(function(event){ event.preventdefault(); // if we don't do this, the page is actually var data = $(this).serialize(); $.ajax({ url : 'apiscript.php', // the script we're calling type: 'POST', // the method we use data : data, // the serialized data datatype : "text", // the expected response data type success : successcallback // what to do if we succeed }); }); } $(document).ready(init); </script> Ludwig- Maximilians- Universität München Mul6media im Netz WS 2012/13 - Übung 6-17

18 DataType The DataType field allows us to specify the type of data that we expect from the server: Text HTML Script JSON Ludwig- Maximilians- Universität München Mul6media im Netz WS 2012/13 - Übung 6-18

19 JSON JavaScript Object Nota6on Human- readable format for data exchange Based on key- value pairs example: { } "firstname": "John", "lastname": "Doe", "phone": [ { "type": "Home", "number": " " }, { "type": "Mobil", "nummer": " " } ] Ludwig- Maximilians- Universität München Mul6media im Netz WS 2012/13 - Übung 6-19

20 Example: AJAX- Request $(document).ready(function(){ // anonymous submit handler $("#contactform").submit(function(event){ // this prevents the page from refreshing event.preventdefault(); // make an object from our form data. // use console.log(data) to inspect it. var data = $(this).serialize(); $.ajax({ url: "json.php", type: "POST", data: data, datatype: "text", // callback with response data success: function(response){ // we fill this out later. } }); }); }); Ludwig- Maximilians- Universität München Mul6media im Netz WS 2012/13 - Übung 6-20

21 Example: PHP- Script json.php <?php // test script to send a response in json format. $data = $_POST; // we just return all parameters as json echo json_encode($data); Ludwig- Maximilians- Universität München Mul6media im Netz WS 2012/13 - Übung 6-21

22 Example: $.parsejson(data) // callback with response data success: function(response){ var output = $("#output"); var jsonresponse = $.parsejson(response); } // iterate over key/value pairs and // append each pair to the output container $.each(jsonresponse,function(key,value){ // create a container // for its id // add some text var child = $('<div />').html(key+': '+value); child.appendto(output); }); Ludwig- Maximilians- Universität München Mul6media im Netz WS 2012/13 - Übung 6-22

23 AJAX Debugging To send requests manually (not via a script), you can use a number of tools For Chrome: Postman (also as standalone app) REST Console For Firefox: REST Client RESTeasy Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-23

24 Same Origin Policy (SOP) Part 1 Example: your script runs is executed at hhp://example.com Same origin: hhp://example.com hhp://example.com/ hhp://example.com/another/page Different origin: hhp:// hhp://example.com:3830/ hhps://example.com hhp://example.org Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-24

Same Origin Policy (SOP) Part 2 SOP tries to hamper cross site scrip$ng Error message example: SOP would block AJAX Mashups en6rely L It will become apparent once you start using your backend

25 Same Origin Policy (SOP) Part 2 SOP tries to hamper cross site scrip$ng Error message example: SOP would block AJAX Mashups en6rely L It will become apparent once you start using your backend scripts remotely Solu6ons for Mashups: - Cross- Origin Resource Sharing (CORS) - JSON with Padding (JSONP) - Apache Proxies Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-25

26 Fast forward Write down 1 thing that you have learned today. Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-26

27 Assignment 6 Topic: Currency Converter Due in: 2 Weeks Due date: Programming consul$ng: (no or very few slides, no input, just programming help) Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-27

28 Thanks What are your ques$ons? Ludwig- Maximilians- Universität München Online Mul6media WS 2014/15 - Übung 06-28

Multimedia im Netz Online Multimedia Winter semester 2015/16. Tutorial 07 Minor Subject

Multimedia im Netz Online Multimedia Winter semester 2015/16 Tutorial 07 Minor Subject Ludwig-Maximilians-Universität München Online Multimedia WS 2015/16 - Tutorial 06 (NF) - 1 Today s Agenda Recap AJAX