js 给select 绑定改变后的事件onchange

 

当id 为action的select 标签发生改变时，执行handleChange() 方法

select id="action" onchange="handleChange()" 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <form action="/upload" method="post" enctype="multipart/form-data">
    <input type="hidden" style="display: none" placeholder="id" name="announcement_id" value="{{ announcement.id }}" >
    <br>
    <input type="text" size="60" value="{{ announcement.name }}" disabled>
    <br>
    <textarea style="width: 431px; height: 343px" disabled> {{ announcement.content }}</textarea>
    <br>
    <span>变更结束时间：</span><input id="end_time" disabled type="datetime-local" name="end_time" value="now" >
    <br>
    <select id="action" onchange="handleChange()" name="select" style="width: 392px;">
        <option  value="over">变更结束</option>
        <option  value="delay">推迟结束时间</option>
    </select>
    <button type="submit" value="提交">提交</button>
</form>
</div>
<script>

    // 选择select 后触发动作
    function handleChange() {
    var obj = document.getElementById('action'); // 定位id
    var index = obj.selectedIndex; // 选中索引
    var value = obj.options[index].value; // 选中值
        if (value == "delay" )(
            document.getElementById("end_time").value= {{ announcement.end_time }}
        )else if (value == "over" )(
            document.getElementById("end_time").value=now
        )
    {#alert(value);#}
    }
</script>
</body>
</html>

 

posted on 2023-03-29 21:01  zhangmingda  阅读(444)  评论(0)  编辑  收藏  举报

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