jquery - 如果选择下拉列表中的字段为空，则显示工具提示

Question

我想在选择下拉列表为空时为其创建验证。我会在我的jquery中放什么？

这是我的html

<form id="createForm" name="createForm" class="form-horizontal" onsubmit="return validateForm()" method="post" action="" autocomplete="off">
    <!-- CSRF Token -->
    <input type="hidden" name="_token" value="{{{ csrf_token() }}}" />
    <!-- ./ csrf token -->
    <input type="hidden" id="type_id1" name="type_id1" value="52" />
    <div class="col-md-4 col-md-offset-1">
        <!-- Code -->
        <div class="form-group">
                <label class='control-label'>Code</label>
                    <input class="form-control" type="text" name="code" id="code" value="{{{ $laptop_code }}}"  readonly= 'readonly'/>
        </div>
        <!-- ./ code -->

        <!-- Model -->
        <div class="form-group required">
                <label class='control-label'>Model</label>
            <input class="form-control" type="text" name="model" id="model" value="" required/>
        </div>
        <!-- ./ model -->

        <!-- Processor -->
        <div class="form-group required">
                <label class='control-label'>Processor</label>
                <select class="form-control" name="processor" id="processor" required>
                        <option value="" selected="selected">Select Processor</option>
                        @foreach ($procs->items as $item)
                            <option value="{{{ $item->id }}}">{{{ $item->alias}}}</option>
                        @endforeach
                    </select>
        </div>
        <!-- ./ processor -->

当我单击提交按钮时，它将创建一个工具提示或气泡弹出窗口，它是空的并被填充

标签： jquerylaravel