javascript - 如果类中的元素为空，则禁用按钮

Question

如果类元素中有任何空字段，我想禁用提交按钮。

$(document).ready(function (){
  fees = [];
$('#button').attr('disabled',true); 
});

function submitButton() {           
  // var fees = $('.fee').val();
    var total = $('#total').val();
    $(".fee").each(function(index, value){ 
       fees.push($(this).val().trim()); 
    });   
    if(fees.includes('') && total = '') {
        $('#button').attr('disabled',true);
    }   else {
        $('#button').attr('disabled',false);        
    }   // /else

}//fuction

JS fiddle link

Answer 1

只需检查输入中是否有内容，如果您通过删除禁用类来激活按钮

$('input').on('keyup', function(){
  var enable = true
  $('input').each(function(index, element){
      if ($(element).val() == "" || $(element).val() == null){
        enable = false;
      }
  });
  
  if (enable){
    $('button').removeAttr('disabled');
  }else{
    $('button').attr('disabled','disabled');
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" /><br /><br />
<input type="text" /><br /><br />
<input type="text" />

<button disabled>Confirm</button>

编辑 1.0:

$(document).ready(function (){
  fees = [];
$('#button').attr('disabled',true);	
});
	//submit button enable disable
function submitButton() {			
  var total = $('#total').val();
	$(".fee").each(function(index, value){ 
        fees.push($(this).val().trim()); 
     });   
	
}//fuction



function disableButton(){
     var enable = true
      $('input.useToCheck').each(function(index, element){
          if ($(element).val() == "" || $(element).val() == null){
            enable = false;
          }
      });
      
      if (enable){
        $('button').removeAttr('disabled');
      }else{
        $('button').attr('disabled','disabled');
      }
}


  $('input').on('keyup', function(){
 disableButton();
    });
    
  $('#more').on('click', function(){
 disableButton();
    });

//autocomplete script    
$(document).on('focus','.search',function(){
let type = $(this).data('type');

$(this).autocomplete({
    source: [{
    	label: 1,
      value: 1,
    	data: {
        t_id: 1,
        Fee: 9.99
      }
    }, {
    	label: 2,
      value: 2,
    	data: {
        t_id: 2,
        Fee: 1
      }
    }],
    autoFocus: true,
    minLength: 1,
    select: function( event, ui ) {
        let id_num = $(this).attr('id').substring(5);

        $(this).val(ui.item.value);
        $('#fee_' + id_num).val(ui.item.data.Fee);
        $('#total').val(ui.item.data.Fee);
        //$(this).attr('data-type', ui.item.type);
        return false;
    },
  });
});

var i=$('table#first tr').length;
$("#more").on('click',function(){
	html = '<tr>';
	html += '<td><input type="text" data-type="type" onKeyUp="submitButton();" id="test_'+i+'" class="search useToCheck" placeholder="Enter 1 or 2 only"> </td>';
	html += '<td><input type="number" id="fee_'+i+'" class="fee" placeholder="Fee"></td>';
	html += '</tr>';
	$('table#first').append(html);
	i++;
   disableButton();
    $('input').on('keyup', function(){
 disableButton();
    });
});

#button {
 margin: 50px;
}

<link href="https://code.jquery.com/ui/1.11.4/themes/ui-darkness/jquery-ui.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<!--hidden div-->
<div class="Popup">
<table id="first">
	<thead>
		<tr>
			<th>Name</th>
			<th>Fee</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td><input type="text" data-type="type" onKeyUp="submitButton();" id="test_1" class="search useToCheck" placeholder="Enter 1 or 2 only"></td>	
		<td><input type="number" id="fee_1" class="fee" placeholder="Fee"></td>
    <td><a id="more"> More Row </a></td>
	</tr>
</tbody>
</table>
<h3> Table 2 </h3>
<table id="tests">
	<thead>
		<tr>
			<th>Student</th>
			<th>Total</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td><input type="text" data-type="type" onKeyUp="submitButton();" id="student" class="search useToCheck"></td>	
		<td><input type="number" id="total"></td>
	</tr>
</tbody>
</table>
</div>
<button type="button" id="button"> submit </button>