Implement checkbox checkbox example code based on javascript

Implement checkbox checkbox example code based on javascript_javascript skills

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Release： 2016-05-16 15:17:19

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The example in this article explains the detailed code for implementing the checkbox in JavaScript and shares it with you for your reference. The specific content is as follows

Rendering:

Specific code:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
function select_all(obj)
{
  //取得由所有hobby构成的一个数组对象
  //如果表单中，存在多个同名的name，将产生一个数组
  var arr = document.form1.hobby;
  if(obj.checked)
  {
    //为true执行代码
    for(var i=0;i<arr.length;i++)
    {
      arr[i].checked = true;
    }
  }else
  {
    //为false执行代码
    for(var i=0;i<arr.length;i++)
    {
      arr[i].checked = false;
    }
  }
}
function select_no_all()
{
  //取得所有的hobby对象
  var arr = document.form1.hobby;
  for(var i=0;i<arr.length;i++)
  {
    if(arr[i].checked)
    {
      //如果选中，则取消
      arr[i].checked = false;
    }else
    {
      //如果没选中，则选中
      arr[i].checked = true;
    }
  }
}
</script>
</head>

<body>
<form name="form1">
<fieldset>
  <legend>选择你感兴趣的类别</legend>
  <input type="checkbox" name="hobby" value="音乐" />音乐
  <input type="checkbox" name="hobby" value="看书" />看书
  <input type="checkbox" name="hobby" value="体育" />体育
  <input type="checkbox" name="hobby" value="足球" />足球
  <input type="checkbox" name="hobby" value="电脑" />电脑<br />
  <input type="checkbox" name="hobby" value="小说" />小说
  <input type="checkbox" name="hobby" value="文学" />文学
  <input type="checkbox" name="hobby" value="动漫" />动漫
  <input type="checkbox" name="hobby" value="经济" />经济
  <input type="checkbox" name="hobby" value="电影" />电影<br />
  <input type="checkbox" name="hobby" value="美术" />美术
  <input type="checkbox" name="hobby" value="管理" />管理
  <input type="checkbox" name="hobby" value="历史" />历史
  <input type="checkbox" name="hobby" value="旅游" />旅游
  <input type="checkbox" name="hobby" value="戏剧" />戏剧
</fieldset>
  <input type="checkbox" onclick="select_all(this)" value="全选" />全选
  <input type="checkbox" onclick="select_no_all()" value="反选" />反选
</form>

</body>
</html>

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I hope this article will be helpful to everyone learning JavaScript programming.