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Forms and JavaScript can be good for creating simple user interaction or
simple applications. Following is a simple calculator I created as an example.
Put this is the <head> tag.
There is also an equals sign which calls "CalcTot," and a Clear button which calls "CalcClear".
I have set up three main variables - "CurTot" which is a
floating point integer of the total, without the current number in the textbox.
"CurNum" is a string representation of the current number being entered (I.E. what
is in the textbox). Lastly "CurOp" gives a string of the operator that is going
to be used in the next operation.
I'm aware that JavaScript is a very loosely
typed language, but it helps to have a definite idea of the data type of each
variable. You can see I have frequently changed the types of variables using the
parseFloat and toString methods.
Many other applications can be developed, and although JavaScript is often overlooked in favor of Java and other solutions, it still can prove very useful in a web site. JavaScript does not have to load the Java Virtual Machine and therefore does not have the loading delay or slow speed often associated with Java.
Hopefully this proves useful, and I hope to see many more people using JavaScript to interact with users, and create small fast applications.
About the author: Mark Young is a Web Designer and Software Programmer for eDuck Web Design and hails from the land of kiwis. He can be reached at mailto:mark.young@educk.co.nz.
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