Using a simple Array of Variables with [interpret]

The [interpret] context is very powerful command in the hands of a skilled WebDNA programmer.

Let's suppose you have need a simple array of eight variables. We could name them sequentially like this:

If we wanted to preset all these variables to null, you would use the [text] context like so:

However, there is an easier way to set them all using the [loop] context.
[loop start=1&end=8]

Later in your code you could call the variables individually by simply placing the [variable1], [variable2], [variable3] ... [variable8] where needed. But if you need to display them all at once you can use the [loop] again.
[loop start=1&end=8]

The [interpret] context is a vary powerful way of processing code inside code, and you need to be extra careful with your usage of the brackets when using [interpret] because it's easy to forget one of the ]. Understanding this is tricky for new programmers so let's break down the above example step by step:

WebDNA will always process from the inside out as explained here:

In this example the [index] provides the numbers 1 through 8.

Take the numbers and insert them where you see [index]
[variable[index]] becomes [variable1]

Expanding outward we then have [interpret][variable1][/interpret]
When WebDNA sees this it will return the information stored in the variable.

The [interpret] context is very powerful command in the hands of a skilled WebDNA programmer. It allows you to create truly dynamic code. Matthew Perosi - Psi Prime


Top Articles:


BioType is a behavioral biometrics WebDNA function based on ADGS research and development (from version 8...

WebDNA Modules

A list of the currently available modules...

Download WebDNA Applications

WebDNA applications...

WebDNA Libraries

A list of available libraries for WebDNA...

Tips and Tricks

A list of user-submitted tips ...

Technical Change History

This Technical Change History provides a reverse chronological list of WebDNA changes...

Related Readings:

Export data to Excel

Here's a handy way to export your data to a text or Excel file...

Handling credit card numbers

Encrypting the credit card numbers does the job quite nicely...

Removing whitespace

How can I remove all whitespace entered by a user from an input box (ie card number)...

Setting a 30-minute Cookie

Configuring the expires time for a short-term cookie is tricky...

WebDNA interaction with ImageMagick

How to pass variables to ImageMagick using a [shell] context?...

Cloning a Record