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Checkboxes - At Least 1 is Selected?

Checkboxes - At Least 1 is Selected?

Checkboxes - At Least 1 is Selected?

Hi guys,

I have this checkboxes:

<input name="BookBox" id="BookBox" type="checkbox" value="12" />Assess
<input name="BookBox" id="BookBox" type="checkbox" value="14" />Communication
<input name="BookBox" id="BookBox" type="checkbox" value="4" />Family
<input name="BookBox" id="BookBox" type="checkbox" value="3" />Document
<input name="BookBox" id="BookBox" type="checkbox" value="6" />Computer

How do you make the visitor to click/check at least one box before submitting the form?

Thanks for any ideas.

RE: Checkboxes - At Least 1 is Selected?


For example by calling onsubmit a function like this :

CODE --> JavaScript

function checkCheckbox(event)
  if (! Array.from(document.querySelectorAll('input[name="BookBox"]')).filter(i => i.checked).length) {
    alert('At least one checkbox must be checked')
  • See it in action at https://jsfiddle.net/cdmy75ap/
  • Used just ECMAScript 6, no library.
  • To keep it simple, this checks all inputs with name "BookBox", regardless whether they are checkboxes or not or belong to the form about to submit or not.
    Just change the .querySelectorAll() call to event.target.querySelectorAll('input[type="checkbox"][name="BookBox"]') to restrict it to checkboxes in the submitted form.
  • Note that id must be unique per document. Using the same id for multiple elements like in your original code, may cause weird behavior later.


RE: Checkboxes - At Least 1 is Selected?

Thanks feherke ..Thats awesome! Have a good day.

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