单击添加按钮php，从第二个下拉菜单中删除/禁用所选选项[从第一个下拉列表中选择]

时间：2019-12-19 13:22:37

标签： php jquery

index.php 

<?php
//index.php

$connect = new PDO("mysql:host=localhost;dbname=test", "root", "");
function fill_unit_select_box($connect)
{ 
 $output = '';
 $query = "SELECT * FROM tbl_unit ORDER BY unit_name ASC";
 $statement = $connect->prepare($query);
 $statement->execute();
 $result = $statement->fetchAll();
 foreach($result as $row)
 {
  $output .= '<option value="'.$row["unit_name"].'">'.$row["unit_name"].'</option>';
 }
 return $output;
}

?>
<!DOCTYPE html>
<html>
 <head>
  <title>Add Remove Select Box Fields Dynamically using jQuery Ajax in PHP</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
 </head>
 <body>
  <br />
  <div class="container">
   <h3 align="center">Add Remove Select Box Fields Dynamically using jQuery Ajax in PHP</h3>
   <br />
   <h4 align="center">Enter Item Details</h4>
   <br />
   <form method="post" id="insert_form">
    <div class="table-repsonsive">
     <span id="error"></span>
     <table class="table table-bordered" id="item_table">
      <tr>
       <th>Enter Item Name</th>
       <th>Enter Quantity</th>
       <th>Select Unit</th>
       <th><button type="button" name="add" class="btn btn-success btn-sm add"><span class="glyphicon glyphicon-plus"></span></button></th>
      </tr>
     </table>
     <div align="center">
      <input type="submit" name="submit" class="btn btn-info" value="Insert" />
     </div>
    </div>
   </form>
  </div>
 </body>
</html>

<script>
$(document).ready(function(){

 $(document).on('click', '.add', function(){
  var html = '';
  html += '<tr>';
  html += '<td><input type="text" name="item_name[]" class="form-control item_name" /></td>';
  html += '<td><input type="text" name="item_quantity[]" class="form-control item_quantity" /></td>';
  html += '<td><select name="item_unit[]" class="form-control item_unit"><option value="">Select Unit</option><?php echo fill_unit_select_box($connect); ?></select></td>';
  html += '<td><button type="button" name="remove" class="btn btn-danger btn-sm remove"><span class="glyphicon glyphicon-minus"></span></button></td></tr>';
  $('#item_table').append(html);
 });

 $(document).on('click', '.remove', function(){
  $(this).closest('tr').remove();
 });

 $('#insert_form').on('submit', function(event){
  event.preventDefault();
  var error = '';
  $('.item_name').each(function(){
   var count = 1;
   if($(this).val() == '')
   {
    error += "<p>Enter Item Name at "+count+" Row</p>";
    return false;
   }
   count = count + 1;
  });

  $('.item_quantity').each(function(){
   var count = 1;
   if($(this).val() == '')
   {
    error += "<p>Enter Item Quantity at "+count+" Row</p>";
    return false;
   }
   count = count + 1;
  });

  $('.item_unit').each(function(){
   var count = 1;
   if($(this).val() == '')
   {
    error += "<p>Select Unit at "+count+" Row</p>";
    return false;
   }
   count = count + 1;
  });
  var form_data = $(this).serialize();
  if(error == '')
  {
   $.ajax({
    url:"insert.php",
    method:"POST",
    data:form_data,
    success:function(data)
    {
     if(data == 'ok')
     {
      $('#item_table').find("tr:gt(0)").remove();
      $('#error').html('<div class="alert alert-success">Item Details Saved</div>');
     }
    }
   });
  }
  else
  {
   $('#error').html('<div class="alert alert-danger">'+error+'</div>');
  }
 });

});
</script>

insert.php 

<?php
//insert.php;

if(isset($_POST["item_name"]))
{
 $connect = new PDO("mysql:host=localhost;dbname=test", "root", "");
 $order_id = uniqid();
 for($count = 0; $count < count($_POST["item_name"]); $count++)
 {  
  $query = "INSERT INTO tbl_order_items 
  (order_id, item_name, item_quantity, item_unit) 
  VALUES (:order_id, :item_name, :item_quantity, :item_unit)
  ";
  $statement = $connect->prepare($query);
  $statement->execute(
   array(
    ':order_id'   => $order_id,
    ':item_name'  => $_POST["item_name"][$count], 
    ':item_quantity' => $_POST["item_quantity"][$count], 
    ':item_unit'  => $_POST["item_unit"][$count]
   )
  );
 }
 $result = $statement->fetchAll();
 if(isset($result))
 {
  echo 'ok';
 }
}
?>

This picture shows the output of the code

我需要的是

我不想显示第二行bags下拉列表中第一行中选择的Select Unit选项。

也就是说，我希望用户从Select Unit下拉列表中仅选择一个选项。必须限制从Select unit下拉菜单中选择相同的选项。

1 个答案:

答案 0 :(得分：0)

看看jquery小提琴链接：https://jsfiddle.net/fyxog73t/3/

HTML代码：

<div class="row">
  <div class="col-md-6">1st Row</div>
  <div class="col-md-6">
    <select id="select_1">
      <option value="">Choose</option>
      <option value="a">A</option>
      <option value="b">B</option>
      <option value="c">C</option>
      <option value="d">D</option>
      <option value="e">E</option>
    </select>
  </div>
</div>
<div class="row">
  <div class="col-md-6">2st Row</div>
  <div class="col-md-6">
    <select id="select_2">
      <option value="">Choose</option>
      <option value="a">A</option>
      <option value="b">B</option>
      <option value="c">C</option>
      <option value="d">D</option>
      <option value="e">E</option>
    </select>
  </div>
</div>
<div class="row">
  <div class="col-md-6">3st Row</div>
  <div class="col-md-6">
    <select id="select_3">
      <option value="">Choose</option>
      <option value="a">A</option>
      <option value="b">B</option>
      <option value="c">C</option>
      <option value="d">D</option>
      <option value="e">E</option>
    </select>
  </div>
</div>

JS代码：

$(document).on('change', '[id^="select_"]', function(){
    var dropdown_value = $(this).val();
    var dropdown_id = $(this).attr('id');
  // code to update options from other dropdowns excluding currently selected dropdown
    if(dropdown_value != "") {
    $('[id^="select_"]:not([id="'+dropdown_id+'"])').find("option[value='"+dropdown_value+"']").attr('disabled', true);
    }

  // code to check, if any disabled option is present with it's value not present in other dropdown as selected option. If so then removing disabled option for that dropdown
    $('[id^="select_"]:not([id="'+dropdown_id+'"])').find("option[value!='"+dropdown_value+"']:disabled").each(function(){
        dropdown_value = $(this).val();
        dropdown_id = $(this).parent().attr('id');

    if($('[id^="select_"]:not([id="'+dropdown_id+'"])').find("option[value='"+dropdown_value+"']:selected").length == 0) {
            $(this).removeAttr('disabled');
        }
    });
});

已使用以下步骤来获得所需的输出：

1）为每个下拉列表编写的更改方法。
2）在该on change方法中，禁用其他下拉菜单的选项，该选项的值与当前下拉菜单中的所选选项相同。
3）然后检查其他下拉菜单中是否禁用了这些选项（当前选定的下拉菜单除外）。检查该禁用值是否在其他下拉列表中作为选定值存在。如果未选中，则将其禁用。

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