Html 从多项选择中发布值
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Post values from a multiple select
提问by user1430949
How can I post values from a multiple select in a form? When I hit submit none of the selected values are posted.
如何从表单中的多项选择发布值？当我点击提交时，没有任何选定的值被发布。
<form id="form" action="" method="post">
<div>
<select id="inscompSelected" multiple="multiple" class="lstSelected">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
<input type="submit" value="submit">
</div>
</form>
回答by iambriansreed
You need to add a nameattribute.
您需要添加一个name属性。
Since this is a multiple select, at the HTTP level, the client just sends multiple name/value pairs with the same name, you can observe this yourself if you use a form with method="GET": someurl?something=1&something=2&something=3.
由于这是一个多选，在 HTTP 级别，客户端只是发送多个具有相同名称的名称/值对，如果您使用带有method="GET": someurl?something=1&something=2&something=3.
In the case of PHP, Ruby, and some other library/frameworks out there, you would need to add square braces ([]) at the end of the name. The frameworks will parse that string and wil present it in some easy to use format, like an array.
对于 PHP、Ruby 和其他一些库/框架，您需要[]在名称末尾添加方括号 ( )。框架将解析该字符串并以某种易于使用的格式（如数组）呈现它。
Apart from manually parsing the request there's no language/framework/library-agnostic way of accessing multiple values, because they all have different APIs
除了手动解析请求之外，没有语言/框架/库不可知的方式来访问多个值，因为它们都有不同的 API
For PHP you can use:
对于 PHP，您可以使用：
<select name="something[]" id="inscompSelected" multiple="multiple" class="lstSelected">
回答by Chin2
try this : here select is your select element
试试这个：这里选择是你的选择元素
let select = document.getElementsByClassName('lstSelected')[0],
options = select.options,
len = options.length,
data='',
i=0;
while (i<len){
if (options[i].selected)
data+= "&" + select.name + '=' + options[i].value;
i++;
}
return data;
Data is in the form of query string i.e.name=value&name=anotherValue
数据采用查询字符串的形式 iename=value&name=anotherValue
