Javascript tutorials for beginners - Imrokraft
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Javascript tutorials for beginners - Imrokraft
- 1. ANAND S KRISHNAN SUNDAR RAJANCRAFTING THE FUTURE
- 2. INTRODUCTION • Java script is a scripting language mostly used in Client-side web • Java script is an implementation of ECMA standard. • ECMA means it defines the syntax and commonly used object such as number and code. • J script is the MS version of Java script
- 3. CSS How it looks? JS What it does? HTML It defines the structure BASIC STRUCTURE OF A WEB PAGE
- 4. MY FIRST JS PGM <html> <head><title>First JavaScript Page</title></head> <body> <h1>First JavaScript Page</h1> <script type="text/javascript"> document.write("<hr>"); document.write("Hello World Wide Web"); document.write("<hr>"); </script> </body> </html>
- 5. WHY I STUDY JS?? • To create user interface in web page Ex: menu, pop-up alert, windows etc. Manipulating web content dynamically -Change the content and style of an element -Replace images on a page without page reload -Hide/Show contents -FORM VALIDATION
- 6. alert(), confirm(), and prompt() <script type="text/javascript"> alert("This is an Alert method"); confirm("Are you OK?"); prompt("What is your name?"); prompt("How old are you?","20"); </script>
- 7. Event Handlers Triggered when onChange The value of the text field, text area, or a drop down list is modified onClick A link, an image or a form element is clicked once onDblClick The element is double-clicked onMouseDown The user presses the mouse button onLoad A document or an image is loaded onSubmit A user submits a form onReset The form is reset onUnLoad The user closes a document or a frame onResize A form is resized by the user EVENT HANDLERS
- 8. JS MVC FRAMEWORK call call back MODEL VIEW CONTROLER API
- 9. ADVANTAGES • Java script is executed on the client side • Java script is comparatively a easy language. • Java script is relatively fast to end user. • Extended functionality to web page.
- 10. DISADVANTAGES Security issues • JS code once appended to the webpage executes on client servers immediately. • Can also be used to explore the user system. • Certain restriction is set by modern web standards on browser JS rendering Varies • Different layout engines may render JS difficulty result in inconsistency in terms of functionality and interface.