lecture5
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This document is a lecture on JavaScript that discusses core concepts like statements, objects, arrays, functions, events, validation, frameworks, libraries, debugging tools, and compression tools. It provides an overview and references for further reading on topics like the JavaScript language, DOM manipulation, events, validation with regular expressions, and popular JavaScript frameworks and libraries.
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![JavaScript
<script type="text/javascript">
// <![CDATA[
. . .
// ]]>
</script>
3](https://image.slidesharecdn.com/2621009/85/lecture5-4-320.jpg)
![JavaScript
<script language="Javascript1.5">
// <![CDATA[
. . .
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<script type="text/javascript">
// <![CDATA[
document.write("hello, world");
// ]]>
</script>
<noscript>
goodbye, world
</noscript>
6](https://image.slidesharecdn.com/2621009/85/lecture5-7-320.jpg)
![focus()
<script type="text/javascript">
// <![CDATA[
// put cursor in username field if empty
if (document.forms.login.username.value == "")
{
document.forms.login.username.focus();
document.forms.login.username.value = document.forms.login.username.value;
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else
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document.forms.login.password.focus();
document.forms.login.password.value = document.forms.login.password.value;
}
// ]]>
8](https://image.slidesharecdn.com/2621009/85/lecture5-9-320.jpg)
![Objects
var obj = new Object();
var obj = {};
obj.key = value;
obj["key"] = value;
var obj = { key: value };
12](https://image.slidesharecdn.com/2621009/85/lecture5-13-320.jpg)
![Arrays
var a = new Array();
var a = [];
a[0] = "foo";
a[1] = "bar";
a[2] = "baz";
13](https://image.slidesharecdn.com/2621009/85/lecture5-14-320.jpg)
![Arrays
var a = new Array();
var a = [];
a[a.length] = "foo";
a[a.length] = "bar";
a[a.length] = "baz";
14](https://image.slidesharecdn.com/2621009/85/lecture5-15-320.jpg)
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lecture5
- 1. Computer Science E-75 Building Dynamic Websites Harvard Extension School http://cs75.net/ Lecture 5: JavaScript David J. Malan [email protected] 0
- 2. Project 1 1
- 3. JavaScript Core JavaScript 1.5 Reference http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference A re-introduction to JavaScript http://developer.mozilla.org/en/docs/A_re-introduction_to_JavaScript JavaScript Reference http://www.w3schools.com/jsref/ JavaScript Tutorial http://www.w3schools.com/js/ 2
- 4. JavaScript <script type="text/javascript"> // <![CDATA[ . . . // ]]> </script> 3
- 5. JavaScript <script language="Javascript1.5"> // <![CDATA[ . . . // ]]> </script> 4
- 7. noscript <script type="text/javascript"> // <![CDATA[ document.write("hello, world"); // ]]> </script> <noscript> goodbye, world </noscript> 6
- 8. Statements break const continue do ... while for for ... in for each ... in function if ... else return switch throw try ... catch var while with ... http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference#Statements 7
- 9. focus() <script type="text/javascript"> // <![CDATA[ // put cursor in username field if empty if (document.forms.login.username.value == "") { document.forms.login.username.focus(); document.forms.login.username.value = document.forms.login.username.value; } // else put cursor in password field else { document.forms.login.password.focus(); document.forms.login.password.value = document.forms.login.password.value; } // ]]> 8
- 10. Validation 9
- 11. Regular Expressions RegEx http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Functions:RegExp String http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Functions:String http://www.w3schools.com/jsref/jsref_obj_regexp.asp 10
- 12. Global Objects Array Boolean Date Function Math Number Object RegExp String ... http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference#Global_Objects 11
- 13. Objects var obj = new Object(); var obj = {}; obj.key = value; obj["key"] = value; var obj = { key: value }; 12
- 14. Arrays var a = new Array(); var a = []; a[0] = "foo"; a[1] = "bar"; a[2] = "baz"; 13
- 15. Arrays var a = new Array(); var a = []; a[a.length] = "foo"; a[a.length] = "bar"; a[a.length] = "baz"; 14
- 16. OOP (Prototype-Based) // constructor function Foo() { // property this.counter = 0; } // method this.protoype.add = function(n) { this.counter += n; } 15
- 17. Event Handlers onblur onchange onclick onfocus onkeydown onkeyup onload onmousedown onmouseup onmouseout onmouseover onmouseup onresize onselect onsubmit ... http://www.w3schools.com/jsref/jsref_events.asp 16
- 18. CSS Properties className style http://codepunk.hardwar.org.uk/css2js.htm 17
- 19. blink function blinker() { var blinks = document.getElementsByName("blink"); for (var i = 0; i < blinks.length; i++) { if (blinks[i].style.visibility == "visible") blinks[i].style.visibility = "hidden"; else blinks[i].style.visibility = "visible"; } } 18
- 20. YUI Event Utility YAHOO.util.Event.addListener(window, "load", function() { window.setInterval("blinker()", 500); }); http://developer.yahoo.com/yui/event/ 19
- 21. Frameworks Dojo http://dojotoolkit.org/ Prototype http://www.prototypejs.org/ script.aculo.us http://script.aculo.us/ YUI http://developer.yahoo.com/yui/ 20
- 22. YUI Library Utilities Animation Utility Drag and Drop Utility ImageLoader Utility ... http://developer.yahoo.com/yui/ 21
- 23. YUI Library Controls/Widgets AutoComplete Button Calendar Color Picker Container Menu Slider TabView TreeView ... http://developer.yahoo.com/yui/ 22
- 26. Debuggers FireBug https://addons.mozilla.org/en-US/firefox/addon/1843 JavaScript Debugger https://addons.mozilla.org/en-US/firefox/addon/216 25
- 27. Compressors JSMin http://javascript.crockford.com/jsmin.html packer http://dean.edwards.name/packer/ ShrinkSafe http://dojotoolkit.org/docs/shrinksafe YUI Compressor http://developer.yahoo.com/yui/compressor/ 26
- 28. Computer Science E-75 Building Dynamic Websites Harvard Extension School http://cs75.net/ Lecture 5: JavaScript David J. Malan [email protected] 27