我有一个selectpicker multiselect下拉列表。当我选择任何选项时,我无法调用'onclick'。但这适用于正常的html多个下拉列表。如何使用selectpicker?
以下是代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-
select/1.6.3/css/bootstrap-select.min.css" />
<link rel="stylesheet" href="https:
//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script
src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js">
</script>
<script
src=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"
>
</script>
<script src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-
select/1.6.3/js/bootstrap-select.min.js"></script>
</head>
<body>
<form action="/action_page.php">
<select class="selectpicker" name="cars" multiple>
<option value="volvo" onclick="myFunction(this)">Volvo</option>
<option value="bmw" onclick="myFunction(this)">Bmw</option>
<option value="opel" onclick="myFunction(this)">Opel</option>
<option value="audi" onclick="myFunction(this)">Audi</option>
</select>
<input type="submit">
</form>
<p>Hold down the Ctrl (windows) / Command (Mac) button to select
multiple options.</p>
<script type="text/javascript">
function myFunction(option) {
if (option.selected) {
alert(option.text);
}
}
</script>
</body>
</html>
答案 0 :(得分:2)
我已将下拉列表更改为:
<select class="selectpicker" onchange="myFunction()" id="cars" name="cars" multiple>
<option value="volvo">Volvo</option>
<option value="bmw">Bmw</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
然后在下面修改你的myFunction:
var oldarr = [];
var newarr = [];
function myFunction() {
if ($("#cars option:selected").length == 1) {
oldarr = [];
oldarr.push($("#cars option:selected").val());
alert($("#cars option:selected").val());
}
else {
newarr = [];
$("#cars option:selected").each(function(i){
newarr.push($(this).val());
});
newitem = $(newarr).not(oldarr).get();
if (newitem.length > 0) {
alert(newitem[0]);
oldarr.push(newitem[0]);
}
else {
oldarr = newarr;
}
}
}
基本上,oldarr将存储以前所选项目列表。然后我们将所选项目的最新列表插入到newarr中。然后我们比较newarr中的内容,而不是oldarr中的内容。这样我们只能过滤掉最新点击的项目。如果用户改为取消选择项目,我们只需将newarr分配给oldarr。
答案 1 :(得分:0)
我使用jQuery来做到这一点。因为你使用select from bootstrap,它会以列表的形式排序而不是选项,这就是为什么它不适合你
$(function() {
$('.selectpicker').on('change', function(){
var selected = $(this).find("option:selected").text();
alert(selected);
});
});
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.3/css/bootstrap-select.min.css" />
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js">
</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.6.3/js/bootstrap-select.min.js"></script>
<form action="/action_page.php">
<select class="selectpicker" name="cars" multiple>
<option value="volvo" >Volvo</option>
<option value="bmw">Bmw</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
<input type="submit">
</form>
<p>Hold down the Ctrl (windows) / Command (Mac) button to select
multiple options.</p>
&#13;
希望这会有所帮助..!
答案 2 :(得分:0)
试试这个,使用forEach找到所选的选项
var selectEl = document.querySelector('.selectpicker');
var options = document.querySelectorAll('.selectpicker option');
selectEl.addEventListener('change', function() {
options.forEach(function(option) {
if(option.selected) { alert(option.value); }
})
})
&#13;
<select class="selectpicker" name="cars" multiple>
<option value="volvo">Volvo</option>
<option value="bmw">Bmw</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
&#13;
或使用jQuery find:select
$('.selectpicker').change(function() {
var thisValue = $(this).find(':selected').attr('value') ;
alert(thisValue);
})
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select class="selectpicker" name="cars" multiple>
<option value="volvo">Volvo</option>
<option value="bmw">Bmw</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
&#13;
希望帮助:)