一旦用户选择等级或部门,我想在当前下拉列表下方显示另一个下拉列表。从新列表中选择后,用户可以提交表单。同样,如果用户选择任何其他选项(姓氏除外),则会出现一个文本框,需要在他们单击提交按钮之前填写该文本框。<form action="viewEmployeeHTML.php" method="post"> <div class="outer-div"> <div class="inner-div"> <br><br><br> <h2>Search By:</h2> <select name="selectionToView" class="SelectBox"> <option value="Select">-- Select --</option> <option value="ID">ID</option> <option value="FirstName">First Name</option> <option value="MiddleName">Middle Name</option> <option value="LastName">Last Name</option> <option value="Email">Email</option> <option value="Phone">Phone</option> <option value="IP_Phone">IP Phone</option> <option value="OfficeNumber">Office Number</option> <option value="CoordinatorName">Coordinator Name</option> <option value="Rank">Rank</option> <option value="Department">Department</option> <option value="JoiningDate"> Joining Date</option> <option value="Committee_AND_Unit">Committee/Unit</option> </select><br><br><br> </div> </div> <br><br><br> <center><input type="submit" value="VIEW" name="view"></center></form>我试过这段代码,但对我不起作用:<form action="viewEmployeeHTML.php" method="post"> <div class="outer-div" > <div class="inner-div"> <br><br><br> <h2>Search By:</h2> <select name="selectionToView" class="SelectBox" onchange="OnSelectionChange()"> <option value="Select">-- Select --</option> <option value="ID">ID</option> <option value="FirstName">First Name</option> <option value="MiddleName">Middle Name</option> <option value="LastName">Last Name</option> <option value="Email">Email</option>
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