JavaScript Cookbook
Basic Structure
<SCRIPT language="JavaScript">
The script itself
</SCRIPT>
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May be before (onload) or after </HTML> (onunload), in <HEAD> (functions group) or in <BODY> (when needed).
or online : <A href="javascript:alert('Hello!')">How are you ?</A>
or from a file : <script src="myfile.js"></script>
Javascript Syntax
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Instruction Separator :
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;
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Comment line :
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// Comment
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Function Declaration :
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function function_name(Variables) { function_body ... return result }
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Condition 1 :
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if (condition) { expression1 } else { expression2 }
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Condition 2 :
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while (condition) { expression }
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Loop :
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for (Initialisation;Ending Condition;Step Command) { ... }
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Some system functions
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Get the current date :
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var date=new Date()
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Convert date into time type :
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var time=date.getTime() (1000th of second)
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Convert time into date type :
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date.setTime(time) (mm/dd/yyyy hh:mm:ss)
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Get day from date :
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date.getDay()
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Get month from date :
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date.getMonth()
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Get year from date :
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date.getYear()
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Get hours from date :
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date.getHours()
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Get minutes from date :
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date.getMinutes()
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Get seconds from date :
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date.getSeconds()
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Convert date into string type :
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string=date.toLocaleString()
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Ask for a prompt :
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answer=prompt(question_string,default_value) (= NULL if Cancel)
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Open an Alert window :
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alert(string) (Buttons: OK)
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Open a Confirm window :
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answer=confirm(string) (Buttons: OK and Cancel)
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Return the width of current window :
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screen.width
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Return the height of current window :
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screen.height
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Return the number of colors :
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screen.colorDepth (in Bytes)
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Return the name of the explorer :
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navigator.appName
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Return the version of the explorer :
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navigator.appVersion
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Return the reference of the document :
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document.referrer
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Number of letters before 1st caracter :
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string.indexOf(caracter)
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Number of letters before last caracter :
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string.lastIndexOf(caracter)
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Return the value of a form input :
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input.value
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Status value of a window (link) :
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window.status='status_appearing_in_the_lower_bar'
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Return the lower integer value of real :
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Math.floor(real)
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Some system processes
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Display a string type :
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adr.document.write(string) (string can be any "text and HTML marks", and adr the window address)
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Open a window :
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var adr=window.open(url,"","width="+width+",height="+height+",left="+left+",top="+up)
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Close the current window :
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window.close()
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Set the cursor in the form input :
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input.focus()
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Set a script action with a timeout :
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setTimeout(script, timeout)
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Some (usefull ?) Javascripts
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