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Posted 18 May 2017

Another Twig Ternary Example

, 18 May 2017
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Another Twig Ternary example


Previously in my Simplified Web Development with JSON and the Twig Ternary Operator, I had used JSON that had boolean values. Recently, I created another form that has a survey with checkboxes and I stored the JSON with string values instead. This article gives an alternate example of using the Twig ternary operator to handle strings.

The JSON Code

My survey JSON sample looks like the following example:


In the above JSON, the keys represent the survey questions, and the string values represent the checkbox that was chosen. In the above case, “strong_A” means “Strong Agree”, and “some_D” means “Somewhat Disagree”. It’s just a simpler way to write/code the JSON and still keep it understandable.

I struggled for a long time on how to handle processing of the JSON data in my Twig template when presenting a view of the form that was submitted. I show the results of the submitted form in an HTML table with a table row for each question and the selected checkboxes. So one row consists of the question + checkbox1 + checkbox2 + checkbox3 + checkbox4, and a total of 4 questions. So to do this in Twig, I struggle with how to create the for loop.

I thought maybe I could do a Twig for loop using {% for i in 0..3 %} to process each of the 4 checkboxes, and thus I was thinking of using the following JSON code:


So in the above, I would store each checkbox as a boolean in the JSON array, however, this would actually require a lot more Twig code, and a lot of if/else statements. I wanted to simplify my code and reduce the number of lines required.

Problems with Twig If Statements

One way of processing whether any of the checkboxes is selected is by using if/else statements, however, the code gets messy and looks something like the following code sample:


Notice each HTML td element has an if/else statement, and a total of 32 lines are used for one table row. This is a lot of code.

Simplifying the Code with the Twig Ternary Operator

I simplified the code by using the Twig ternary operator (as described in the documentation) to replace all the if/else statements. For example, to check my JSON in Twig to see if the “Strongly Agree” checkbox is selected, I use the following code in my HTML td element:


Where in the above “(survey[‘Recommend’] == ‘strong_A’)” does a comparison to see if it matches the string, and if so, then show a checked checkbox. The code CheckCode is an HTML escape code to render a checked checkbox. The code UncheckCode is an empty checkbox.

Example in Twigfiddle

I created a Twigfiddle here to show you the twig working in case you need to see it in action. Also, you will need to see the result in HTML, so there's a twig fiddle showing the resultant rendered HTML in this SyncFiddle.



This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Alvin Bunk
Software Developer Taft College
United States United States
I’m a software developer. Currently I’m working at Taft College as a Student Success and Support Programmer.

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