How to design a form where inputs can be computed from other inputs? [duplicate]

1. How to detect the duplication of values of input fields?
2. How to prevent duplicate entry in JavaScript?
3. How to check duplicate values in textbox using jquery?
4. How to check duplicate values in HTML table in jquery?

How to detect the duplication of values of input fields?

At the time of input before submitting the form: For this, we can use “oninput” event provided by HTML itself which triggers the function specified in javascript whenever input changes in input field.

How to prevent duplicate entry in JavaScript?

Javascript filter() Method: The filter() method creates a new array of elements that pass the condition we provide. It will include only those elements for which true is returned. We can remove duplicate values from the array by simply adjusting our condition.

How to check duplicate values in textbox using jquery?

count("$. value == '" + $(this). val() + "'") > 1) // If more than 1 have the same value than highlight this textbox and display an error message $(this). addClass('duplicate'); $('#custom-field-validator').

How to check duplicate values in HTML table in jquery?

If your question is "How do I check that no two td elements have the same contents?" you can do something like this: var contents = , duplicates = false; $("#yourtableidhere td"). each(function() var tdContent = $(this).