单击下拉列表中的项目时如何强制单击事件

时间:2018-03-23 14:35:10

标签: javascript c# html asp.net

点击我的下拉列表中的某个项目时,需要采取一些措施。每次返回页面时都会触发当前SelectedIndexChanged事件,而不更改下拉列表中的选择。我想添加一个点击事件,这样它实际上可以在实际点击项目时采取行动。但是,下拉列表没有click事件。我可以做些什么来强制点击事件吗?

1 个答案:

答案 0 :(得分:2)

我对你想要实现的目标不满意,但这是一个简单的例子,每次点击一个下拉项时触发一个功能



function log(event){
  console.log(event.target.text)
}

.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

/* The container <div> - needed to position the dropdown content */
.dropdown {
    position: relative;
    display: inline-block;
}

/* Dropdown Content (Hidden by Default) */
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

/* Links inside the dropdown */
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

/* Change color of dropdown links on hover */
.dropdown-content a:hover {background-color: #f1f1f1}

/* Show the dropdown menu on hover */
.dropdown:hover .dropdown-content {
    display: block;
}

/* Change the background color of the dropdown button when the dropdown content is shown */
.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
&#13;
<div class="dropdown">
  <button class="dropbtn">Dropdown</button>
  <div class="dropdown-content">
    <a href="#" onclick="log(event)">Link 1</a>
    <a href="#" onclick="log(event)">Link 2</a>
    <a href="#" onclick="log(event)">Link 3</a>
  </div>
</div> 
&#13;
&#13;
&#13;