Choose from the dropdown menu: click to select multiple options or deselect all by selecting a single option

Question

Choose from the dropdown menu: click to select multiple options or deselect all by selecting a single option

Is there a way to create a Select box where all options can be selected with a single click and then unselected with another single click? The goal is to only allow the user to select one option at a time, rather than multiple options.

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.0/jquery.min.js"></script>
<select>
  <option value="all">select all /unselect all</option>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="opel">Opel</option>
  <option value="audi">Audi</option>
</select>

`

javascript twitter-bootstrap bootstrap-4

Answer 1

Answer №1

A ComboBox is typically used to select only ONE value, but you may want to consider using checkboxes for multiple selections.

To achieve your desired functionality, you need to add an event listener to the ComboBox and store the selected values in a variable. The example below demonstrates how you can do this:

// HTML

<select id="myComboBox">
  <option value="all">Select All / Unselect All</option>
  <option value="volvo">>Volvo</option>
  <option value="saab">Saab</option>
  <option value="opel">Opel</option>
  <option value="audi">Audi</option>
</select>

// JavaScript

var selectedValues = [];

function getAllSelectedValues(){
  return $('#myComboBox option:selected').toArray().map(({value}) => value);
}

function comboBoxHandler(event) {
  const { target } = event;
  
  if (target && target.value == 'all') {
    selectedValues = getAllSelectedValues();
  } else {
    selectedValues = [target.value];
  }
  
  // Perform actions based on selected values
  console.log(selectedValues);
}

$('#myComboBox').on('change', comboBoxHandler);

Answer 2

A ComboBox is typically used to select only ONE value, but you may want to consider using checkboxes for multiple selections.

To achieve your desired functionality, you need to add an event listener to the ComboBox and store the selected values in a variable. The example below demonstrates how you can do this:

// HTML

<select id="myComboBox">
  <option value="all">Select All / Unselect All</option>
  <option value="volvo">>Volvo</option>
  <option value="saab">Saab</option>
  <option value="opel">Opel</option>
  <option value="audi">Audi</option>
</select>

// JavaScript

var selectedValues = [];

function getAllSelectedValues(){
  return $('#myComboBox option:selected').toArray().map(({value}) => value);
}

function comboBoxHandler(event) {
  const { target } = event;
  
  if (target && target.value == 'all') {
    selectedValues = getAllSelectedValues();
  } else {
    selectedValues = [target.value];
  }
  
  // Perform actions based on selected values
  console.log(selectedValues);
}

$('#myComboBox').on('change', comboBoxHandler);

Choose from the dropdown menu: click to select multiple options or deselect all by selecting a single option

Answer №1

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