The goal for any Web site owner is get to attract visitors and get them to stick around. This is referred optionyards as making your Web site "sticky". One way to do that is to provide useful features like online calculators. For example, your visitor can enter a length in English feet and it will be converted to a length in metric meters. I keep the code as simple as possible and I will explain the code in detail so optionyards you will feel confident enough to modify the code for your own Web site.
If you optionyards the description here, you can optionyards this optionyards basic structure to design all kinds of units converters, for example, weight, volume, and area units converters. You could create a Web site that is totally dedicated to providing calculators and converters; that should draw plenty of traffic. The Length Units Converter has three optionyards the form where the user enters a optionyards value and selects measurement units, a matrix of conversion factors, and a small Java Script function to perform the units optionyards.
At the end of this article is a working model of the application to check out. There are several interesting optionyards to note about this code. The form does not provide a submit button or any button at all. Optionyards fact, the optionyards event optionyards the optionyards is disabled by making it optionyards a value of "false".
The reason for this is because if the user hits optionyards "Enter" key after optionyards a value in the form's text box, optionyards form would be submitted, causing it to lose the values entered. Not a big deal, but annoying to the user. The form works by executing a function named "Convert" in response to the onChange events of the text box and select boxes drop-down lists. The optionyards function will display the results of the conversion in the html span.
Note the style rule applied to optionyards text box to make the optionyards align to the right, and the style rules applied to the span optionyards make it appear as a box with text aligned to the right.
The order that the units are listed in the options list is important. They must be listed in the same order as the converion factors are listed in the matrix.
A matrix is defined in Java Script as an "array of arrays". The code for this is shown below. Each of optionyards elements of this array inches, feet, yards, and so on is an array itself. The array elements must be listed in the same order as the optionyards are listed in optionyards select element. I emphasize this because if you modify the application, for example add millimeters, optionyards must put the conversion factors in the proper order in the arrays.
Menu - More Java Script Programming. The code for the form is shown below.
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Yep, we know it hurts, but what else is going on in your leg? Click on the article below to zoom in and read. Oli is now back optionyards again and well on the way back to full fitness optionyards competing at the highest optionyards. We will be following Oli in his rehabilitation optionyards full fitness and competing again with the aim of qualifying for the London Olympics.
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