Title: Switching between 2 checkboxes
Last modified: April 28, 2022

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# Switching between 2 checkboxes

 *  Resolved [monika064](https://wordpress.org/support/users/monika064/)
 * (@monika064)
 * [4 years, 1 month ago](https://wordpress.org/support/topic/switching-between-2-checkboxes/)
 * Hi, I’m trying to create a calculator that offers 2 options: inches and centimeters.
   And it would have to calculate differently based on what the person picked. I
   managed to create a checkbox but it doesn’t work in a way that would be logical.
   If I have “inches” checked by default, and I want to switch to “centimeters”,
   it won’t allow me to do that. I first have to remove the tick from “inches” and
   then I can choose “centimeters”. And that is not very intuitive and it gives 
   an impression the calculator is not working. Is there a way to make it work that
   way?
 * Thank you

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Plugin Author [codepeople](https://wordpress.org/support/users/codepeople/)
 * (@codepeople)
 * [4 years, 1 month ago](https://wordpress.org/support/topic/switching-between-2-checkboxes/#post-15598987)
 * Hello [@monika064](https://wordpress.org/support/users/monika064/)
 * Thank you very much for using our plugin. The issue is simple you are using the
   incorrect control. You are describing the behavior of a radio button field. You
   tried to emulate the behavior of radio buttons by using a checkbox field limiting
   the number of choices to tick at once. Please, use a radio buttons field for 
   the measurement units.
 * Best regards.
 *  Thread Starter [monika064](https://wordpress.org/support/users/monika064/)
 * (@monika064)
 * [4 years, 1 month ago](https://wordpress.org/support/topic/switching-between-2-checkboxes/#post-15599206)
 * Wonderful! Thank you so much for clearing that out for me 🙂
 *  Thread Starter [monika064](https://wordpress.org/support/users/monika064/)
 * (@monika064)
 * [4 years, 1 month ago](https://wordpress.org/support/topic/switching-between-2-checkboxes/#post-15604054)
 * Hi, can I please ask one more question. I can’t seem to figure it out. I have
   a Calculated Field and I would like it be completely blank while it’s not showing
   any results yet. Currently, there is always “0” inside. I have “dependencies”
   that work if the result is less than 7 -> show “fieldX” and since the placeholder
   is always “0”, it’s showing the text by default.
 * I thought it might work if I leave predefined value blank and I check “Use predefined
   value as placeholder.” but it doesn’t work. Even if I try to put something like“-”
   in the predefined value, it doesn’t show up as a placeholder in the field, it
   just keeps showing “0”.
 * Thank you!
    -  This reply was modified 4 years, 1 month ago by [monika064](https://wordpress.org/support/users/monika064/).
 *  Plugin Author [codepeople](https://wordpress.org/support/users/codepeople/)
 * (@codepeople)
 * [4 years, 1 month ago](https://wordpress.org/support/topic/switching-between-2-checkboxes/#post-15604084)
 * Hello [@monika064](https://wordpress.org/support/users/monika064/)
 * If the form is configured to evaluate the equations dynamically (it is a checkbox
   in the “Form Settings” tab), the equation in the calculated field is evaluated
   after rendering the form:
 * [https://resources.developers4web.com/cff/images/documentation/form-settings-tab.png](https://resources.developers4web.com/cff/images/documentation/form-settings-tab.png)
 * So, you have two alternatives:
 * You can disable the dynamic evaluation of the equations. But in this case, you
   should insert a button in the form and tick the “Calculate” option as its type
   to evaluate the equations manually.
 * Or, you can use conditional statements in the equations. For example, if you 
   have the equation `fieldname1+fieldname2`, and you want to evaluate it only after
   the user enter the values of both fields, you can edit the equation as follows:
 * `IF(AND(fieldname1|r != '', fieldname2|r != ''), fieldname1+fieldname2, '')`
 * The plugin always tries to transform the fields values into numbers to use them
   in the mathematical operations. But using the field’s name with the `|r` modifier,
   you can access to its raw value without preprocessing.
 * The previous equation can be read as follows:
 * If the values of fields fieldname1 and fieldname2 are not empty texts, then evaluate
   the mathematical operation (`fieldname1+fieldname2`), else return empty text (`''`).
 * Best regards.
 *  Thread Starter [monika064](https://wordpress.org/support/users/monika064/)
 * (@monika064)
 * [4 years, 1 month ago](https://wordpress.org/support/topic/switching-between-2-checkboxes/#post-15604322)
 * Thank you for a detailed explanation!

Viewing 5 replies - 1 through 5 (of 5 total)

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 * 5 replies
 * 2 participants
 * Last reply from: [monika064](https://wordpress.org/support/users/monika064/)
 * Last activity: [4 years, 1 month ago](https://wordpress.org/support/topic/switching-between-2-checkboxes/#post-15604322)
 * Status: resolved