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JavaScript JS301

JavaScript JS301. Week 3: Practical JavaScript. Where does my JavaScript go?. Popular convention says the HTML head: <!DOCTYPE html> <html><head> <title>JS301</title> <script type="text/javascript"> document.write('Hello World!'); </script> </head> <body></body> </html>.

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JavaScript JS301

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  1. JavaScript JS301 Week 3: Practical JavaScript

  2. Where does my JavaScript go? Popular convention says the HTML head: <!DOCTYPE html> <html><head> <title>JS301</title> <script type="text/javascript"> document.write('Hello World!'); </script> </head> <body></body> </html>

  3. Where does my JavaScript go? For best performance, but it as close to the bottom of the document as you can: <!DOCTYPE html> <html> <head><title>JS301</title></head> <body> ... <script type="text/javascript"> document.write('Hello World!'); </script> </body> </html>

  4. Where does my JavaScript go? If you want to share JavaScript between HTML documents, include it from an external file: <script src="myscript.js" type="text/javascript"> </script>

  5. Form Validation • Alert users to problems before submitting to the server • Make sure to also validate on the server - never trust the client! • http://jsfiddle.net/zymsys/enDzA/

  6. AJAX • Interact with the server without page loads • Asynchronous JavaScript and XML • XHR: XMLHTTPRequest • Not limited to XML - I prefer JSON • http://jsfiddle.net/zymsys/sHhsf/

  7. Rich User Interfaces • Dialogs: http://jsfiddle.net/zymsys/HcnRd/ • Tabs: http://jsfiddle.net/zymsys/AcUqr/ • Input Controls: • Autocomplete: http://jsfiddle.net/zymsys/eZNQk/ • Buttons: http://jsfiddle.net/zymsys/HqEng/ • Dates: http://jsfiddle.net/zymsys/vgzGU/ • More: http://jqueryui.com/demos/

  8. Next Week • Knockout? • OOP? • Patterns? • Something else?

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