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Populate HTML/PHP Dropdown Based on First Dropdown Selection

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[愿得一人]
[愿得一人] 2021-01-16 08:25

I Have 1 Drop Down Which Is Used For Category (Food, Drink etc)

In my MYSQL Table (t_menu_category) I Have :

+----+---------------+------------------
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2条回答
  • 猫巷女王i
    2021-01-16 08:33

    you could create a PHP file with the request and call it with AJAX.

    getSubCategory.php

    <?php
$category = "";
if(isset($_GET['category'])){
    $category = $_GET['category'];
}

/* Connect to the database, I'm using PDO but you could use mysqli */
$dsn = 'mysql:dbname=my_database;host=127.0.0.1';
$user = 'my_user';
$password = 'my_pass';

try {
    $dbh = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

$sql = 'SELECT sub_category_name as subCategory FROM t_menu_category WHERE category_name = :category';
$stmt = $dbh->prepare($sql);
$stmt->bindValue(':category', $category);
$stmt->execute();

return  json_encode($stmt->fetchAll());

    and add some jquery to catch when an category is selected and ask the server for the corresponding sub-category:

    <script>
    $(document).ready(function () {
        $('#item_category').on('change', function () {

            //get selected value from category drop down
            var category = $(this).val();

            //select subcategory drop down
            var selectSubCat = $('#item_sub_category');

            if ( category != -1 ) {

                // ask server for sub-categories
                $.getJSON( "getSubCategory.php?category="+category)
                .done(function( result) {    
                    // append each sub-category to second drop down   
                    $.each(result, function(item) {
                        selectSubCat.append($("<option />").val(item.subCategory).text(item.subCategory));
                    });
                    // enable sub-category drop down
                    selectSubCat.prop('disabled', false);                
                });

            } else {                
                // disable sub-category drop down
                selectSubCat.prop('disabled', 'disabled');
            }
        });    

    });
</script>

    also add a value on your first option:

    <option value="-1" selected="selected">-- Select Category --</option>
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  • 花落未央
    2021-01-16 08:52

    I have a simple solution to select states depending on a country php/javascript/mysql

    MySQL tables

    country 
      country_code varhar(5)
      country_name varchar(100)

state
      country_code varhar(5)
      state_code   varchar(5)
      country_name varchar(100)

    Country/State selection in main.php file

    <html>
   <body> 
     Country
            <?php
                $sql="SELECT * FROM country order by country_name";
                $rs=$conn->Execute($sql);
                echo '<select  value="'.$country_code.'"  name="country_code"  id="country_list"   onChange="stateList(this.value);" />';
                echo  '<option value="">--Select--</option>';
                $rs->MoveFirst();
                while (!$rs->EOF) {
                    echo  '<option value="'.$rs->fields['country_code'].'"';
                    if  ($rs->fields['country_code'] == $country_code) {echo " selected";}
                    echo  '>'.$rs->fields['country_name'].'</option>';
                    $rs->MoveNext();
                }
                echo '</select>';
            ?>

     State
            <?php
                $sql="SELECT * FROM state where contry_code = '$country_code' order by state_name";
                $rs=$conn->Execute($sql);
                echo '<select   value="'.$state_code.'"  name="state_code" id="state_list"   />';
                echo  '<option value="">--Select--</option>';
                $rs->MoveFirst();
                while (!$rs->EOF) {
                    echo  '<option value="'.$rs->fields['state_code'].'"';
                    if  ($rs->fields['state_code'] == $state_code) {echo " selected";}
                    echo  '>'.$rs->fields['state_name'].'</option>';
                    $rs->MoveNext();
                }
                echo '</select>';
            ?>
   </body>
</html>

    Java Script

    <script type="text/javascript">
function stateList(val) {
   var select = document.getElementById( "state_list" );
   var url    = "get_statelist.php?country_code="+val;
   $.ajax({
      type: "GET",
      url: url,
      data:'',
      success: function(data){
         $("#state_list").html(data);
      }
   });
}

    get_stataelist.php

    <?php
session_start();
$country_code = $_GET['country_code'];
$conn        = connect_db()  //Make your own connection entry conn with Server,DB User ID, DB Password and DB Name

if  ($country_code  !=  "") {
    $sql="SELECT * FROM state where coutry_code = '$country_code'  order by state_name";
    $rs=$conn->Execute($sql);

    echo  '<option value="">--Select--</option>';

    $rs->MoveFirst();
    while (!$rs->EOF) {
        echo  '<option value="'.$rs->fields['state_code'].'">'.$rs->fields['state_name']."</option>";
        $rs->MoveNext();
    }
}

?>
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