目标是通过按下按钮重置下拉列表的值。使用 vanilla javascript 和 html,以下代码可以正常工作:
HTML/JS:
button = document.getElementById('button')
button.addEventListener('click', e => {
console.log('executed')
document.getElementById('sel').value = 'bike'
})
<select id="sel">
<option value="car">1</option>
<option value="bike">2</option>
<option value="cycle">3</option>
</select>
<button id="button">Test</button>
正如预期的那样,按下按钮时,下拉列表中会列出值“2”。但是,一旦我将物化 CSS 添加到我的 HTML 中,当我单击按钮时,下拉列表中的值就不会改变。我知道事件侦听器被触发,因为每当我按下按钮时,控制台中都会显示“已执行”。但是,下拉菜单中的值不会像以前在 vanilla javascript/html 中那样改变。怎么会发生这种情况,我该怎么做才能解决此问题以找到来源?
带有实体化 CSS 的 HTML/JS:
$(document).ready(function() {
// Initialize materialize data picker
$('.datepicker').datepicker({
'format': 'yyyy-mm-dd'
});
$('select').formSelect();
});
button = document.getElementById('button')
button.addEventListener('click', e => {
console.log('executed')
document.getElementById('sel').value = 'bike'
})
<html>
<head>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0-rc.1/css/materialize.min.css" integrity="sha256-qj3p6P1fJIV+Ndv7RW1ovZI2UhOuboj9GcODzcNFIN8=" crossorigin="anonymous" />
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0-rc.1/js/materialize.min.js" integrity="sha256-SrBfGi+Zp2LhAvy9M1bWOCXztRU9Ztztxmu5BcYPcPE=" crossorigin="anonymous"></script>
</head>
<body>
<select id="sel">
<option value="car">1</option>
<option value="bike">2</option>
<option value="cycle">3</option>
</select>
<button id="button" type="button" class="bold waves-effect waves light btn-large teal lighten-2">Test</button>
</body>
</html>
感谢提供编辑以使此可执行文件的人。多玩几次后,我注意到按下按钮后,如果您再次单击下拉菜单,则在您选择另一个选项之前,值会自动更改为“2”。
您可以在更新 select 元素后重新初始化 eventListener 中的插件。
除了我的代码之外,您应该将初始化外包给一个函数以保持 DRY。
$(document).ready(function() {
// Initialize materialize data picker
$('.datepicker').datepicker({
'format': 'yyyy-mm-dd'
});
$('select').formSelect();
});
button = document.getElementById('button')
button.addEventListener('click', e => {
console.log('executed')
document.getElementById('sel').value = 'bike'
$('.datepicker').datepicker({
'format': 'yyyy-mm-dd'
});
$('select').formSelect();
})
<html>
<head>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0-rc.1/css/materialize.min.css" integrity="sha256-qj3p6P1fJIV+Ndv7RW1ovZI2UhOuboj9GcODzcNFIN8=" crossorigin="anonymous" />
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/1.0.0-rc.1/js/materialize.min.js" integrity="sha256-SrBfGi+Zp2LhAvy9M1bWOCXztRU9Ztztxmu5BcYPcPE=" crossorigin="anonymous"></script>
</head>
<body>
<select id="sel">
<option value="car">1</option>
<option value="bike">2</option>
<option value="cycle">3</option>
</select>
<button id="button" type="button" class="bold waves-effect waves light btn-large teal lighten-2">Test</button>
</body>
</html>