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JavaScript Ajax & DOM Manipulation Matthew Batchelder
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Before We Start! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
JS: What it is and isn’t ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
JavaScript Sandbox ,[object Object],[object Object],[object Object]
JS: Usage ,[object Object],<html> <head> <title>Example JS Page</title> <script type=“text/javascript”> // javascript code goes here </script> </head> <body> … </body> </html>
JS: Literals ,[object Object],<script type=“text/javascript”> var myNumber = 123; var myString = ‘Bork!’; var myBoolean = true; var myFunction = function(){ return ‘hello’;} var myRegExp = /bork/gi; var myArray = [1, 2, 3]; var myCarObject = { color: ‘red’, tires: 4, windows: 6 } </script>
JS: Objects ,[object Object],[object Object],<script type=“text/javascript”> var myNumber = new Number(123); var myString = new String(‘Bork!’); var myBoolean = new Boolean(true); var myFunction = new Function(‘’, “return ‘hello’”);} var myRegExp = new RegExp(‘bork’); var myArray = new Array(); myArray[0] = 1; myArray[1] = 2; myArray[2] = 3; var myCarObject = new Object(); myCarObject.color = ‘red’; myCarObject.tires = 4; myCarObject.windows = 6; </script>
JS: Objects ,[object Object],[object Object],<html> <head> <title>Examples</title> <script type=&quot;text/javascript&quot;> var bork = 'Bork!'; var w00t = { hello: 'Greetings', yo: function(){ alert(bork + ' ' + this.hello); } }; var zomg = { nested: { iMeanReallyNested: { seriously: { out: function(){ alert('whee!'); } } } } }; w00t.yo(); zomg.nested.iMeanReallyNested.seriously.out(); </script> </head> <body> ... </body> </html>
JS: Control Structures if (bork) { //... }  else  { //... } while (bork) { //... } for (var i = 0; i< 10; i++) { //... } for (var element  in  array_of_elements) { //... } do  { //... }  while (bork); switch (bork) { case  1: // if bork == 1... case  'whee': // if bork == 'whee'... case  false: // if bork == false... default : // otherwise ... } try  { //... }  catch (err) { //... }
What is the DOM? ,[object Object],[object Object],<html> <head> <title>Example JS Page</title> </head> <body> <form id=“some_form”> <input type=“text” name=“bork”/> <input type=“submit” value=“Go”/> </form> </body> </html>
Finding DOM Elements ,[object Object],[object Object],[object Object],[object Object]
DOM Element Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],DOM Attributes Node Types Here’s a  good article  that uses these.
Manipulating the DOM ,[object Object],[object Object],[object Object],[object Object]
innerHTML ,[object Object],[object Object],[object Object],[object Object]
Events ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Mouse Keyboard Frame/Object Form
Simple Alert Box <html> <head> <title>Example Message Box Page</title> <script type=“text/javascript”> alert(‘I like butter’); </script> </head> <body> … </body> </html>
Confirm Box Bound to an Event <html> <head> <title>Example Message Box Page</title> <script type=&quot;text/javascript&quot;> function doLoad() { document.getElementById('sweet-link').addEventListener(‘click’, confirmClick, false); }//end doLoad function confirmClick() { return confirm(‘Are you sure you wish to go to that link?’); }//end confirmClick window.addEventListener(‘load’, doLoad, false); </script> </head> <body> <a id=&quot;sweet-link&quot; href=&quot;http://borkweb.com&quot;>BorkWeb</a> </body> </html> example
Hiding/Displaying Elements ,[object Object],[object Object]
AJAX ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ajax: XMLHttpRequest ,[object Object],[object Object]
WAIT!!!!!!!!!!!!! Things can actually be a bit easier. How much?  Well most of the above.
WTF? jQuery.  That’s what we use on campus.  Its hawt.
What is jQuery? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Finding Elements ,[object Object],[object Object],[object Object]
Finding Elements With $ $(‘a’) $(‘.class’) $(‘#id’) $(‘.content div’) $(‘input[name=bork]’) $(‘input:first’) Here’s an  example . Check out the selector syntax for more info.
Lets do some of the stuff we already did… ,[object Object],[object Object],[object Object]
jQuery Coolness ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
jQuery Plugins ,[object Object]
jQuery in myPlymouth ,[object Object],[object Object],[object Object],[object Object],[object Object]
The End. ,[object Object],[object Object],[object Object],[object Object],[object Object]

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JavaScript: Ajax & DOM Manipulation

  • 1. JavaScript Ajax & DOM Manipulation Matthew Batchelder
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10. JS: Control Structures if (bork) { //... } else { //... } while (bork) { //... } for (var i = 0; i< 10; i++) { //... } for (var element in array_of_elements) { //... } do { //... } while (bork); switch (bork) { case 1: // if bork == 1... case 'whee': // if bork == 'whee'... case false: // if bork == false... default : // otherwise ... } try { //... } catch (err) { //... }
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17. Simple Alert Box <html> <head> <title>Example Message Box Page</title> <script type=“text/javascript”> alert(‘I like butter’); </script> </head> <body> … </body> </html>
  • 18. Confirm Box Bound to an Event <html> <head> <title>Example Message Box Page</title> <script type=&quot;text/javascript&quot;> function doLoad() { document.getElementById('sweet-link').addEventListener(‘click’, confirmClick, false); }//end doLoad function confirmClick() { return confirm(‘Are you sure you wish to go to that link?’); }//end confirmClick window.addEventListener(‘load’, doLoad, false); </script> </head> <body> <a id=&quot;sweet-link&quot; href=&quot;http://borkweb.com&quot;>BorkWeb</a> </body> </html> example
  • 19.
  • 20.
  • 21.
  • 22. WAIT!!!!!!!!!!!!! Things can actually be a bit easier. How much? Well most of the above.
  • 23. WTF? jQuery. That’s what we use on campus. Its hawt.
  • 24.
  • 25.
  • 26. Finding Elements With $ $(‘a’) $(‘.class’) $(‘#id’) $(‘.content div’) $(‘input[name=bork]’) $(‘input:first’) Here’s an example . Check out the selector syntax for more info.
  • 27.
  • 28.
  • 29.
  • 30.
  • 31.