0在您當前的代碼中，您使用錯誤的選擇器來獲取選中復選框的總值。如果您檢查當前的 jquery 代碼，即使您檢查了任何值，它也總是給出。因此，您可以使用input[type="checkbox"]:checked它將為您提供選中復選框的正確值。
然后，您將事件放置submit在更改事件中，這就是第一次顯示警告的原因，但是當您選擇某個復選框并再次單擊“保存”按鈕時，它不會消失（也是因為選擇器錯誤），所以我將其分開從變更事件來看。
另外，當選擇框值為ie 時，您忘記顯示tr您所擁有的：因此當值為 時添加到它。hide()2item-option.show()1
工作代碼：
$(".dynamicform_wrapper").on("change", "select", function() {
if ($(this).val() == 2) {
$('#0').find('.option-item').not(':first').remove(); //removed all entries found in
$('#0').find('.option-item:first').hide();
$('#0').find('.item-option').hide();
$('#0').find('.question').attr('colspan', 2);
} else if ($(this).val() == 1) {
// $('#0').find('.container-options').append(newtr); //add input
$('#0').find('.item-option').show();
$('#0').find('.option-item:first').show(); //show option-item which is hidden
$('#0').find('.question').removeAttr('colspan', 2);
}
});
$("#dynamic-form").submit(function(event) {
//getting all inputs which is under tr
var numberChecked = $('#0').find('input[type="checkbox"]:checked').length;
console.log("No of checkbox checked=" + numberChecked)
if (numberChecked > 0) {
$('#0').find('.text-error-check').hide();
$('#0').find('.dynamicform_inner').removeAttr("style");
event.preventDefault();//remove this to submit
} else {
$('#0').find('.text-error-check').show();
$('#0').find('.dynamicform_inner').css({
'border': '2px solid #dd4b39',
'background-color': 'white'
});
event.preventDefault();
}
});
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<form id="dynamic-form" action="" method="post">
<div class="content">
<div class="box box-success box-solid">
<div class="box-header with-border">
<h3 class="box-title">Evaluation</h3>
</div>
<div class="panel-body">
<div class="dynamicform_wrapper"> //where select and change applies
<table class="table table-bordered table-striped">
<thead>
<tr>
<th>Questions</th>
<th style="width: 500px;">Options</th>
<th class="text-center" style="width: 90px;">
<button type="button" class="add-item btn btn-success btn-xs"><span class="glyphicon glyphicon-plus"></span></button>
</th>
</tr>
</thead>
<tbody class="container-items">
<tr id="0" class="item">//ID that I use to find the elements
<td class="question"> //where do i apply colspan
<table class="table table-bordered table-striped">
<tbody>
<tr>
<td class="vcenter">
<span class="panel-title-address">Nr: 1</span>
</td>
<td class="vcenter">
<input type="hidden" id="qquestion-0-id_question" name="qquestion[0][id_question]" value="28">
<div class="form-group field-qquestion-0-type_id required">
<label class="control-label" for="qquestion-0-type_id">Question Type</label>
<select id="qquestion-0-type_id" class="form-control" name="qquestion[0][type_id]" onchange="">
<option value="">-- Select --</option>
<option value="1" selected="">SINGLE / MULIPLE ANSWER</option> // OPTION 1
<option value="2">OPEN QUESTION</option> // OPTION 2
</select>
<p class="help-block help-block-error"></p>
</div>
<div class="form-group field-qquestion-0-title required">
<input type="text" id="qquestion-0-title" class="form-control" name="qquestion[0][title]" value="" maxlength="250" placeholder="Títle">
<p class="help-block help-block-error"></p>
</div>
<div class="form-group field-qquestion-0-score required">
<input type="text" id="qquestion-0-score" class="form-control" name="qquestion[0][score]" value="" placeholder="Score" data-plugin-inputmask="inputmask_2fdcbd27">
<p class="help-block help-block-error"></p>
</div>
<div class="form-group field-qquestion-0-image">
<label class="control-label" for="qquestion-0-image">Image</label>
<input type="file" id="qquestion-0-image" class="empty-value" name="qquestion[0][image]">
<p class="help-block help-block-error"></p>
</div>
<div class="form-group field-qquestion-0-justify_answer">
<div class="checkbox">
<label style="padding:5px;" for="qquestion-0-justify_answer">
<input type="hidden" name="qquestion[0][justify_answer]" value="0"><input type="checkbox" id="qquestion-0-justify_answer" name="qquestion[0][justify_answer]" value="">
Do you want the answer to be justified?
</label>
<p class="help-block help-block-error"></p>
</div>
</div>
</td>
<td class="clearfix"></td>
</tr>
</tbody>
</table>
</td>
<td class="item-option">
<div class="dynamicform_inner">
<table class="table table-bordered">
<thead>
<tr>
<th>Description</th>
<th class="text-center">
<button type="button" class="add-option btn btn-success btn-xs"><span class="glyphicon glyphicon-plus"></span></button>
</th>
</tr>
</thead>
<tbody class="container-opciones">
<tr class="option-item">
<td class="vcenter">
<input type="hidden" id="qoption-0-0-id_option" name="qoption[0][0][id_option]" value="">
<div class="input-group">
<span class="input-group-addon">
<div class="form-group field-qoption-0-0-opcion_correcta required">
<div class="checkbox">
<label style="padding:5px;" for="qoption-0-0-opcion_correcta">
<input type="hidden" name="qoption[0][0][opcion_correcta]" value="0"><input type="checkbox" id="qoption-0-0-opcion_correcta" name="qoption[0][0][opcion_correcta]" value="1">
</label>
<p class="help-block help-block-error"></p>
</div>
</div>
</span>
<div class="form-group field-qoption-0-0-title_option required">
<input type="text" id="qoption-0-0-title_option" class="form-control" name="qoption[0][0][title_option]" value="2" maxlength="250" placeholder="Opción">
<p class="help-block help-block-error"></p>
</div>
</div>
</td>
<td class="text-center vcenter" style="width: 90px;">
<button type="button" class="remove-opcion btn btn-danger btn-xs"><span class="glyphicon glyphicon-minus"></span></button>
</td>
</tr>
</tbody>
</table>
</div>
<div class="form-group text-error-check required has-error" style="display: none;">
<p class="help-block help-block-error">You must select at least 1 option as correct.</p>
</div>
</td>
<td class="text-center vcenter" style="width: 90px; verti">
<button type="button" class="remove-item btn btn-danger btn-xs"><span class="glyphicon glyphicon-minus"></span></button>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary"><span class="fa fa-edit"></span> Modificar</button>
</div>
<br>
<br>
<br>
<br>
