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javascript - 如何根据另一个动态下拉列表和文本框为动态文本框提供默认值？

问题描述

我正在寻找执行以下操作。尝试使 Quantity 列文本框具有基于同一动态表中的下拉列表和文本框的默认值。

因此，在下图中，当 Unit 下拉菜单设置为 2，然后在第 2 行输入 Quantity 为 5 时，下面的任何行都将具有第 2 行的默认数量。因此第 6 行和第 7 行的默认值应为 5。

在此处输入图像描述

<html>
 <head>
  <title></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>
  <div class="container">
   <form method="post" id="insert_form">
    <div class="table-repsonsive">
     <span id="error"></span>
     <table class="table table-bordered" id="item_table">
      <tr>
       <th>Unit</th>
       <th>Name</th>
       <th>Quantity</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>
let restricts = ["bags", "kg"];
function hideQuantity(e) {
    if (restricts.indexOf(e.target.value) > -1) {
        e.target.closest("tr").querySelector(".item_quantity").setAttribute("disabled", "disabled");
    } else {
        e.target.closest("tr").querySelector(".item_quantity").removeAttribute("disabled", "disabled");
    }
}

$(document).ready(function(){
    $(document).on('click', '.add', function () {
        var html = '';
        html += '<tr>';
        html += '<td><select onclick="hideQuantity(event)" name="item_unit[]" id="item_unit" class="form-control item_unit">';
        html += '<option value="">Select Unit</option><option value="bags">Bags</option><option value="inch">Inch</option><option value="kg">Kg</option><?php echo numopt(); ?>';
        html += '</select></td>';
        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><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>

标签： javascriptphpjquery

解决方案

[更新] 提供两种方式的更新。我希望它像您预期的结果一样工作（但仍然像我在评论中建议的那样，建议考虑另一种使用不依赖于“设计”的技术来管理它的方法。像 Javascript 对象或 LocalStorage ......）

let restricts = ["bags", "kg"];
function hideQuantity(e) {
    if (restricts.indexOf(e.target.value) > -1) {
        e.target.closest("tr").querySelector(".item_quantity").setAttribute("disabled", "disabled");
    } else {
        e.target.closest("tr").querySelector(".item_quantity").removeAttribute("disabled", "disabled");
    }
}

$(document).ready(function(){
    $(document).on('click', '.add', function () {
        var html = '';
        html += '<tr>';
        html += '<td><select onclick="hideQuantity(event)" name="item_unit[]" id="item_unit" class="form-control item_unit">';
        html += '<option value="">Select Unit</option><option value="bags">Bags</option><option value="inch">Inch</option><option value="kg">Kg</option><option value="2">2</option><option value="3">3</option><option value="4">4</option>';
        html += '</select></td>';
        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><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();
 });
    
    $(document).on('change keyup focusout','.item_quantity',function(){
        //I called it in french to avoid confusion with value val...
        var valeur =$(this).val();
        var unitreference= $(this).parents("tr").find("td:first select.item_unit").val();
        $('.item_unit').each(function(){
            if($(this).val()==unitreference ){
                $(this).parents("tr").find("td:eq(2) input.item_quantity").val(valeur).attr('disabled', 'disabled');
            }
        });
        $(this).removeAttr("disabled");
    })
    
    $(document).on('change','.item_unit',function(){
        //Update using the unit selector
        var selectedUnit =$(this).val();
        //Here we look for the Quantity field being used as Referece
        var quantRef= $('select option[value='+selectedUnit+']:selected').parents("tr").find("td:eq(2) input.item_quantity:not(:disabled)").val()
        //console.log(selectedUnit)     
        //console.log(quantRef)
        if(quantRef){
        $('.item_unit').each(function(){
            if($(this).val()==selectedUnit ){
                $(this).parents("tr").find("td:eq(2) input.item_quantity").val(quantRef).attr('disabled', 'disabled');
            }
            
        });
        }
    })
    
 $('#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>');
  }
 });
});
<html>
 <head>
  <title></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>
  <div class="container">
   <form method="post" id="insert_form">
    <div class="table-repsonsive">
     <span id="error"></span>
     <table class="table table-bordered" id="item_table">
      <tr>
       <th>Unit</th>
       <th>Name</th>
       <th>Quantity</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>

PS：对不起，我很忙 :) 一个建议：如果可能的话，你可以在单元格表上添加一些类，这样你就可以使用最接近的（）来优化你的代码。

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