# Dependent Dropdown Full (ok)

### 1. [dependent-dropdown-jquery-html](https://github.com/roytuts/jquery/tree/master/dependent-dropdown-jquery-html)

<figure><img src="/files/sYAoqwP7zFHnqMsdNYDk" alt=""><figcaption></figcaption></figure>

C:\xampp8\htdocs\lva\index.php

```
<!DOCTYPE html>
<html>
<head>
  <meta charset='UTF-8' />
  <!--<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>-->
  <script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
  <script language="javascript" type="text/javascript">
    $(document).ready(function() {
      //create arrays to store option and values
      var continents = [{
          display: "Asia",
          value: "asia"
        },
        {
          display: "Africa",
          value: "africa"
        },
        {
          display: "Antarctica",
          value: "antarctica"
        },
        {
          display: "Australia",
          value: "australia"
        },
        {
          display: "Europe",
          value: "europe"
        },
        {
          display: "North America",
          value: "north-america"
        },
        {
          display: "South America",
          value: "south-america"
        }
      ];
      var oceans = [{
          display: "Pacific",
          value: "pacific"
        },
        {
          display: "Atlantic",
          value: "atlantic"
        },
        {
          display: "Indian",
          value: "indian"
        },
        {
          display: "Southern",
          value: "southern"
        },
        {
          display: "Arctic",
          value: "arctic"
        }
      ];
      //If parent option is changed
      $("#parent_selection").change(function() {
        var parent = $(this).val(); //get option value from parent
        switch (parent) { //using switch compare selected option and populate child
          case 'continents':
            $('#child_selection').attr('disabled', false);
            list(continents);
            break;
          case 'oceans':
            $('#child_selection').attr('disabled', false);
            list(oceans);
            break;
          default: //default child option is blank
            $("#child_selection").html('');
            $('#child_selection').attr("disabled", true);
            break;
        }
      });
      //function to populate child select box
      function list(array_list) {
        $("#child_selection").html(""); //reset child options
        $(array_list).each(function(i) { //populate child options
          $("#child_selection").append("<option value='" + array_list[i].value + "'>" + array_list[i].display + "</option>");
        });
      }
    });
  </script>
</head>
<body>
  <div class="wrapper">
    Select :
    <select name="parent_selection" id="parent_selection">
      <option value="">-- Please Select --</option>
      <option value="continents">Continents</option>
      <option value="oceans">Oceans</option>
    </select>
    <select name="child_selection" id="child_selection" disabled="disabled" />
  </div>
</body>
</html>

```

### 2. [Dependent-list-with-jQuery](https://github.com/SATPAL-BHARDWAJ/dependent-list-with-jQuery)

C:\xampp8\htdocs\lva\index.php

<figure><img src="/files/CzVuuYCwkcLLxLPH8dRn" alt=""><figcaption></figcaption></figure>

```
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Dependable list with jQuery</title>
  <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous" />
  <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
</head>
<body>
  <div class="container mt-5">
    <form>
      <!-- Super Parent -->
      <div class="form-group">
        <label for="first_list"> User select </label>
        <select class="form-control" id="first_list">
          <option value="0"> Select User list </option>
          <option value="1"> User A </option>
          <option value="2"> User B </option>
          <option selected value="3"> User C </option>
          <option value="4"> User D </option>
          <option value="5"> User E </option>
        </select>
      </div>
      <!-- Parent: User list and Child: Subject list -->
      <div class="form-group">
        <label for="second_list"> Subject select </label>
        <select class="form-control" id="second_list">
          <option data-list-id="0" value="0"> Select subject list </option>
          <option data-list-id="1" value="1"> Subject A.1 </option>
          <option data-list-id="1" value="2"> Subject A.2 </option>
          <option data-list-id="1" value="3"> Subject A.3 </option>
          <option data-list-id="2" value="4"> Subject B </option>
          <option data-list-id="3" selected value="5"> Subject C </option>
          <option data-list-id="4" value="6"> Subject D </option>
          <option data-list-id="5" value="7"> Subject E </option>
        </select>
      </div>
      <!-- Parent: Subject list and Child: Topic list -->
      <div class="form-group">
        <label for="third_list">Topic select</label>
        <select class="form-control" id="third_list">
          <option data-list-id="0" value="0"> Select Topic list </option>
          <option data-list-id="1" value="1"> Topic A.1.1 </option>
          <option data-list-id="1" value="2"> Topic A.1.2 </option>
          <option data-list-id="1" value="3"> Topic A.1.3 </option>
          <option data-list-id="2" value="4"> Topic A.2.1 </option>
          <option data-list-id="3" selected value="5"> Topic A.3.1 </option>
          <option data-list-id="4" value="6"> Topic B </option>
          <option data-list-id="5" value="7"> Topic C </option>
          <option data-list-id="6" value="8"> Topic D </option>
          <option data-list-id="7" value="9"> Topic E </option>
        </select>
      </div>
      <!-- Parent: Subject list and Child: Question list -->
      <div class="form-group">
        <label for="fourth_list">Question select</label>
        <select class="form-control" id="fourth_list">
          <option data-list-id="0" value="0"> Select Question list </option>
          <option data-list-id="1" value="1"> Question A.1.1 </option>
          <option data-list-id="1" value="2"> Question A.1.2 </option>
          <option data-list-id="1" value="3"> Question A.1.3 </option>
          <option data-list-id="2" value="4"> Question A.2.1 </option>
          <option data-list-id="3" selected value="5"> Question A.3.1 </option>
          <option data-list-id="4" value="6"> Question B </option>
          <option data-list-id="5" value="7"> Question C </option>
          <option data-list-id="6" value="8"> Question D </option>
          <option data-list-id="7" value="9"> Question E </option>
        </select>
      </div>
      <button type="submit" class="btn btn-primary">Submit</button>
    </form>
  </div>
  <script src="dependableList.js"></script>
  <script type="text/javascript">
    createDependableList('#first_list', '#second_list');
    createDependableList('#second_list', '#third_list');
    createDependableList('#second_list', '#fourth_list');
  </script>
</body>
</html>

```

C:\xampp8\htdocs\lva\dependableList.js

```javascript
/**
 * Create dependable list with this function
 * @param {*} parentList-id
 * @param {*} childList-id
 */
function createDependableList(parentList, childList) {
  var options = $(childList + ' option');
  $(parentList).change(function () {
    $(childList).empty();
    options.each((index, option) => {
      if ($(option).data('list-id') == this.value /* || $(option).data('list-id') == 0 */) {
        option.selected = option.selected ? true : false;
        $(childList).append(option);
      }
      $(childList).trigger('change');
    })
    if ($(childList + ' option').length === 0) {
      $(childList).append('<option value="">No option available..</option>');
    }
  })
}

```


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