多选和最大长度（Multiple Select and Maxlength）
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2023-12-01
描述 (Description)
智能选择允许使用maxlength属性选择有限数量的项目。
例子 (Example)
以下示例演示了在Framework7中选择具有可能选定项目数限制的项目 -
<!DOCTYPE html>
<html>
<head>
<meta name = "viewport" content = "width = device-width, initial-scale = 1,
maximum-scale = 1, minimum-scale = 1, user-scalable = no, minimal-ui" />
<meta name = "apple-mobile-web-app-capable" content = "yes" />
<meta name = "apple-mobile-web-app-status-bar-style" content = "black" />
<title>Multiple Select and Maxlength</title>
<link rel = "stylesheet"
href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.min.css" />
<link rel = "stylesheet"
href = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/css/framework7.ios.colors.min.css" />
</head>
<body>
<div class = "views">
<div class = "view view-main">
<div class = "navbar">
<div class = "navbar-inner">
<div class = "left"> </div>
<div class = "center sliding">Multiple Select and Maxlength</div>
<div class = "right"> </div>
</div>
</div>
<div class = "pages navbar-through">
<div data-page = "home" class = "page">
<div class = "page-content">
<div class = "list-block">
<ul>
<li>
<a href = "#" class = "item-link smart-select">
<select name = "car" multiple maxlength = "4">
<optgroup label = "India">
<option value = "delhi" selected>Delhi</option>
<option value = "mumbai">Mumbai</option>
<option value = "bangalore">Bangalore</option>
</optgroup>
<optgroup label = "United Kingdom">
<option value = "london">London</option>
<option value = "belfast">Belfast</option>
<option value = "wells">Wells</option>
</optgroup>
<optgroup label = "Australia">
<option value = "sydney">Sydney</option>
<option value = "perth">Perth</option>
<option value = "melbourne">Melbourne</option>
</optgroup>
</select>
<div class = "item-content">
<div class = "item-inner">
<div class = "item-title">Cities</div>
</div>
</div>
</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
<script type = "text/javascript"
src = "https://cdnjs.cloudflare.com/ajax/libs/framework7/1.4.2/js/framework7.min.js"></script>
<script>
// here initialize the app
var myApp = new Framework7({
animateNavBackIcon:true
});
// If your using custom DOM library, then save it to $$ variable
var $$ = Dom7;
// Add the view
var mainView = myApp.addView('.view-main', {
// enable the dynamic navbar for this view
dynamicNavbar: true
});
</script>
</body>
</html>
输出 (Output)
让我们执行以下步骤，看看上面给出的代码是如何工作的 -
将上面给出的HTML代码保存为服务器根文件夹中的smart_select_multiple_maxlength.html文件。
以http://localhost/smart_select_multiple_maxlength.html打开此HTML文件，输出显示如下。
此处最大长度设置为4.单击“城市”选项时，您可以看到每个城市的不同选项，您最多只能选择四个选项。