What is conditional logic and how can it be used in Ninja Forms
Many conditional forms exist, but the two most basic are AND and OR. An AND statement says that both parts of the statement must be true for the whole statement to be true. For example,” If it is raining and you need to go outside, put on your raincoat”. An OR variable says either one of the parts of a statement must be true for the statement to be true. Example: “If it is raining or you need to go outside, put on your raincoat”.
The different types of conditional logic available in Ninja Forms
The most common type of Conditional Logic is the If/Then/Else statement. It says, if something is true, then run some code. If this something is true and another thing you want to test is also true, then run some other code. This is the most versatile form of conditional logic in Ninja Forms and can be used to do a lot of different things. It can be used to turn fields on and off, redirect to other pages, conditionally check if a field even exists, and much more!
Using the If/Then/Else Conditional Logic in Ninja Forms
When using the If/Then/Else Conditional Logic in Ninja Forms you have these three basic parts. First comes the conditional code that you want to test, then come one or more “if” statements that tell Ninja Forms whether or not you want it to execute some code based on whether it is true or false. Finally, an “else” statement allows you to say what to do if the code being tested is neither true nor false. This can be a simple redirect, a conditional check on another field, hide fields or even redirect to a page with some painless AJAX!
Examples of how to use conditional logic in Ninja Forms
The following examples of conditional logic may help you understand how to use it. First, an array of several forms is created. This array is used to test the condition on the second form and run two different code sections to execute if either part is true. It’s a simple example, but it shows the basic idea behind conditional logic.
The following articles are available to view in the Articles section of the main page:
Filters, sorting and table functions – How to use Ninja Forms filters, sorting and table functions
Multiple value select boxes – How to create a multiple value select box with multiple rows
When used correctly, conditional logic can help you gain more power and control over your applications. Let’s see how this is done in Ninja Forms.
The following conditional logic examples will show you how to use some simple functions to add or remove items from arrays, and how to test the array elements for a match against a value.
Tips for creating effective conditional logic rules
Conditional logic is most flexible when you can use it to test multiple conditions. In order to do this, you must set up one or more array(s) to contain the values that you want Ninja Forms to test. In the following examples I will assume that a form has been created with three fields named: field1, field2 and field3. I will also point out that the conditional logic will be used with two of these fields.
1. CONDITIONAL LOGIC BACKGROUND INFORMATION
I wrote a book titled: “Ninja Forms Conditional Logic” that describes how to use conditional logic effectively. It is sold at Amazon for $39 dollars and is also on Amazon.com. This article post has been based on this book, but the concepts are general enough to fit with other databases. The examples below have been modified to fit with this article.
Troubleshooting tips for common problems with conditional logic
Test your conditional logic rule a bit each day and make sure that it is working properly. If you have a problem with it, try using the FIREFOX browser to test it. I have noticed that there are sometimes problems due to the differences in the way that Internet Explorer and Firefox handle certain types of code. If it works in Firefox, but not Internet Explorer, check the Internet Explorer version of the code. Firebug can be used to test conditional logic rules.
As a rule of thumb, the computer will not run scripts whenever it thinks you are using it. Therefore, if a script is running when you start up your browser and it is suspended, then you should be able to end the script without any problems.
In some cases, tests may fail due to being suspended while the tests are running. This can cause problems with conditional logic rules because a test may test that something has not happened.
Also, a script may be run when you log out of a site, but it will be suspended. This means that if your test is checking that something has not happened, then the test will detect that that something has happened when the test fails during logging out.
One of the advantages of using conditional logic rules is that they will only run when they are needed. In addition, they can tell whether or not things have already happened by looking at what you have already seen. They are therefore very useful for application testing and debugging.
The following are common problems with conditional logic rules. Each can usually be fixed by editing the source code or the source page: