根据javascript中的选择选项显示/隐藏div [英] Show/hide div according to select option in javascript

问题描述

搜索了互联网.了解了如何执行此操作.实现了.但这是行不通的.我想在选择学生时显示div学生，在选择老师时显示div老师.这是jsp文件的一部分.

Searched the internet. Learnt how to do this. Implemented it. But it doesn't work. I want to show the div student when student is selected and the div teacher when teacher is selected. This is a part of a jsp file.

HTML代码:

<table>
    <tr>
       <td>
         <select id="userType">
             <option value="student">STUDENT</option>
             <option value="teacher">TEACHER</option>
             <option value="admin">ADMIN</option>
         </select>
       </td>
    </tr>
<table>

JavaScript代码:

<script type="text/javascript">

    var elem = document.getElementById('userType');
    elem.onchange = function() {
        var studentDiv = document.getElementById('student');
        var teacherDiv = document.getElementById('teacher');
        studentDiv.style.display = (this.value.equals("student")) ? 'block':'none';
        teacherDiv.style.display = (this.value.equals("teacher")) ? 'block':'none';
    };

</script>

自早上以来，我一直在努力做到这一点.也尝试了其他方法.什么都行不通.我在做什么错了?

I've been trying to get this right since morning. Tried other methods as well. Nothing works. What am I doing wrong?

推荐答案

在您的代码中将等于更改为 == ，它可以

Change equals to == in your code and it works DEMO

var elem = document.getElementById('userType');
elem.onchange = function() {
  var studentDiv = document.getElementById('student');
  var teacherDiv = document.getElementById('teacher');
  studentDiv.style.display = (this.value == "student") ? 'block' : 'none';
  teacherDiv.style.display = (this.value == "teacher") ? 'block' : 'none';
};

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