What is the best method to ensure that none of the select option values are left empty?

I have a total of 5 select option drop down menus currently, but this number may increase in the future depending on requirements. The issue I'm facing is that when I select the last element, it returns true even though the other elements are empty. It should only return false if any one of the element values is null.

Here is my code:

<form name="selectForm" action="" onSubmit="return selectValidation();" method="POST">
            <div>
                <select class="selectmenu">
                    <option value="">Select the value</option> 
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                </select>
            </div>
            ...
        </form>

Javascript function:

function selectValidation() {
            var selectIsValid = true;
            $('.selectmenu').each(function(){
                if($(this).val()==='') {
                    selectIsValid = false;
                } else {
                    selectIsValid = true;
                }
            });
            console.log(selectIsValid);
            if(selectIsValid) {
            }
            return false;
        }
javascriptjqueryhtmlcss

Answer №1

In my opinion, a more straightforward approach would be to tally the number of blank values present in the .selectmenu elements:

$('.selectmenu').filter(function(){return $(this).val() == ''}).length

Check out this functional code snippet:

function checkSelections() {
  var numOfEmpties = $('.selectmenu').filter(function(){return $(this).val() == ''}).length;
  if (numOfEmpties) {
    return false;
  }
  return true;
}

$('#btn').click(function() {
  console.log($('.selectmenu').filter(function(){return $(this).val() == ''}).length)
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form name="selectForm" action="" onSubmit="return checkSelections();" method="POST">
            <div>
                <select class="selectmenu">
                    <option value="">Select an option</option> 
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                </select>
            </div>
            <div>
                <select class="selectmenu">
                    <option value="">Select an option</option> 
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                </select>
            </div>
            <div>
                <select class="selectmenu">
                    <option value="">Select an option</option> 
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                </select>
            </div>
            <div>
                <select class="selectmenu">
                    <option value="">Select an option</option> 
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                </select>
            </div>
            <div>
                <select class="selectmenu">
                    <option value="">Select an option</option> 
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                </select>
            </div>
            <div>
                <button type="submit" class="btn">
                    <i class="fa fa-btn fa-user"></i> Submit Selections
                </button>
            </div>
        </form>
<br /><br />
<button id="btn">count empty entries</button>

Answer №2

If you want the code to function correctly, make sure not to set selectIsValid = true; inside your loop. Begin by setting it to true, and only change it to false within the loop if an empty value is found. Then, after the loop, return selectIsValid. It will remain true unless one of the checks fails:

function validateSelect() {
  var selectIsValid = true;
  $('.selectmenu').each(function() {
    if ($(this).val() === '') {
      selectIsValid = false;
      return; // skip remaining checks
    }
  });
  return selectIsValid;
}

$('#test').click(function() {

  console.log(validateSelect());
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form name="selectForm" action="" onSubmit="return validateSelect();" method="POST">
  <div>
    <select class="selectmenu">
      <option value="">Select the value</option>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6">6</option>
      <option value="7">7</option>
      <option value="8">8</option>
      <option value="9">9</option>
      <option value="10">10</option>
    </select>
  </div>
  <div>
    <select class="selectmenu">
      <option value="">Select the value</option>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6">6</option>
      <option value="7">7</option>
      <option value="8">8</option>
      <option value="9">9</option>
      <option value="10">10</option>
    </select>
  </div>
  <div>
    <select class="selectmenu">
      <option value="">Select the value</option>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6">6</option>
      <option value="7">7</option>
      <option value="8">8</option>
      <option value="9">9</option>
      <option value="10">10</option>
    </select>
  </div>
  <div>
    <select class="selectmenu">
      <option value="">Select the value</option>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6">6</option>
      <option value="7">7</option>
      <option value="8">8</option>
      <option value="9">9</option>
      <option value="10">10</option>
    </select>
  </div>
  <div>
    <select class="selectmenu">
      <option value="">Select the value</option>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6">6</option>
      <option value="7">7</option>
      <option value="8">8</option>
      <option value="9">9</option>
      <option value="10">10</option>
    </select>
  </div>
  <div>
    <button type="submit" class="btn">
      <i class="fa fa-btn fa-user"></i> Submit Answers
    </button>
  </div>
</form>


<button id="test">test
  <button>

Answer №3

Essentially, if you encounter a single false instance, you disregard the rest. The actions being performed take precedence over any false findings from later checks. A sample approach would look like this:

function validateSelection() {
    $('.selectmenu').each(function () {
        if ($(this).val() === '') {
            // If any are found empty, stop checking further.
            return false;
        }
    });

    return true;
}

Answer №4

An issue arises when, within your each function, you assign selectIsValid as true for a specific select, which then replaces the value for prior selects. To prevent this, consider eliminating the else statement.

To enhance clarity in the code, it may be beneficial to rename selectIsValid to allSelectsAreValid.

Answer №5

In the event that the return value is false, it triggers a reset of the form.

function validateSelection() {
$('.selectmenu').each(function () {
    if ($(this).val() === '') {
       alert('Please fill out the form completely');
        // If any empty fields are found, stop execution.
        return false;
    }
});

return true;

}

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