Javascript 引导下拉菜单按钮未与传单地图一起显示_Javascript_Html_Css_Bootstrap 4_Leaflet

Javascript 引导下拉菜单按钮未与传单地图一起显示

javascript html css bootstrap-4 leaflet

Javascript 引导下拉菜单按钮未与传单地图一起显示,javascript,html,css,bootstrap-4,leaflet,Javascript,Html,Css,Bootstrap 4,Leaflet,我正在尝试创建一个带有引导按钮的地图。我让地图全屏显示，并把按钮放在上面。代码如下： <!DOCTYPE html> <html> <head> <title>Map</title> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src

我正在尝试创建一个带有引导按钮的地图。我让地图全屏显示，并把按钮放在上面。代码如下：

<!DOCTYPE html>
<html>
<head>

    <title>Map</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="static/bootstrap/js/bootstrap.min.js"></script>

    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link rel="shortcut icon" type="image/x-icon" href="static/favicon.ico" />

    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.4/dist/leaflet.css" integrity="sha512-puBpdR0798OZvTTbP4A8Ix/l+A4dHDD0DGqYW6RQ+9jxkRFclaxxQb/SJAWZfWAkuyeQUytO7+7N4QKrDh+drA==" crossorigin=""/>
    <script src="https://unpkg.com/leaflet@1.3.4/dist/leaflet.js" integrity="sha512-nMMmRyTVoLYqjP9hrbed9S+FzjZHW5gY1TWCHA5ckwXZBadntCNs8kEqAWdrb9O7rxbCaA4lKTIWjDXZxflOcA==" crossorigin=""></script>
    <link rel="stylesheet" media="screen" href ="static/bootstrap/css/bootstrap.min.css">
    <link rel="stylesheet" href="static/bootstrap/css/bootstrap-theme.min.css">

    <style>
        body {
            padding: 0;
            margin: 0;
        }
        html, body, #map {
            height: 100%;
            width: 100%;
        }

        #back_button {
          position: absolute;
          top: 20px;
          left: 20px;
          padding: 10px;
          z-index: 1001;
        }

        #drop_button {
          position: absolute;
          top: 80px;
          left: 20px;
          padding: 10px;
          z-index: 1001;
        }
    </style>


</head>
<body>
    <div id='map'>
    </div>

    <form  action="/" method="post" role="form">
        <button type="submit" class="btn btn-default" id="back_button"><- Back</button>
    </form>

    <div class="dropdown">
      <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" id="drop_button">Dropdown Example
      <span class="caret"></span></button>
      <ul class="dropdown-menu">
        <li><a href="#">HTML</a></li>
        <li><a href="#">CSS</a></li>
        <li><a href="#">JavaScript</a></li>
      </ul>
    </div>
<script>
    var map = L.map('map', {zoomControl:false}).setView([47.57768554635565,-122.16660887002944], 13);

    var coordinate = {{list_latlong | tojson | safe}};
    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
        attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
    }).addTo(map);
    var logoIcon = L.icon({
        iconUrl: './static/picture.png',
        iconSize:     [22, 22], // size of the icon
        iconAnchor:   [11, 22], // point of the icon which will correspond to marker's location
    });

    var i;
    for (i = 0; i < coordinate.length; i++) {
        var point = coordinate[i]
        var text = "";
        text = "<dl><dt>Number: " + point[2] + "</dt>"
        + "<dt>" + point[5] + "</dt>"
        + "<dt>" + point[6] + ", " + point[7] + ", " + point[8] + "</dt>"
        +"</dl>"
        L.marker([point[3],point[4]], {icon: logoIcon}).bindPopup(text).addTo(map);
    }


</script>
</body>
</html>

运行此代码将只显示后退按钮，而不显示下拉按钮。如果我删除

<link rel="stylesheet" media="screen" href ="static/bootstrap/css/bootstrap.min.css">
<link rel="stylesheet" href="static/bootstrap/css/bootstrap-theme.min.css">

显示下拉按钮和后退按钮，但不显示下拉菜单中的元素

<script src="static/bootstrap/js/bootstrap.min.js"></script>

这是一个引导脚本文件，用于使菜单和其他与js相关的功能正常工作。但是为了让它工作，它需要有一个DOM文档对象模型。您当前拥有的是在jQuery之后在顶部触发的脚本，没有任何DOM元素供它使用，菜单元素还没有被解析

在你合上标签之前，试着把这个放在正确的位置。这应该可以让菜单元素正常工作。

我已经为您解决了这个问题，原因不止一个，首先是引导链接错误，其次是在错误的id下拉按钮上添加了错误的样式，所以按钮显示在页脚，所以您看不到它，下面是完整的代码，其中包含编辑一些文件、位置和URL，以及从下拉列表到父div.dropdown的更新新样式

当我尝试时，下拉按钮仍然没有显示。然而，当它正好位于并被删除时，我会看到一个蓝色的下拉按钮。我仍然不能点击这个下拉按钮来查看它的菜单。

<!DOCTYPE html>
<html>
<head>

    <title>Map</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="shortcut icon" type="image/x-icon" href="static/favicon.ico" />
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css">
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.4/dist/leaflet.css"/>

    <style>
        body {
            padding: 0;
            margin: 0;
        }
        html, body, #map {
            height: 100%;
            width: 100%;
        }

        #back_button {
          position: absolute;
          top: 20px;
          left: 20px;
          padding: 10px;
          z-index: 1001;
        }
        .dropdown {
          position: absolute;
          top: 80px;
          left: 20px;
          z-index: 1001;
        }
    </style>
</head>
<body>
    <div id='map'>
    </div>

    <form  action="/" method="post" role="form">
        <button type="submit" class="btn btn-default" id="back_button"><- Back</button>
    </form>
    <div class="dropdown">
      <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" id="drop_button">Dropdown Example
      <span class="caret"></span></button>
      <ul class="dropdown-menu">
        <li><a href="#">HTML</a></li>
        <li><a href="#">CSS</a></li>
        <li><a href="#">JavaScript</a></li>
      </ul>
    </div>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://unpkg.com/leaflet@1.3.4/dist/leaflet.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
    <script>
    var map = L.map('map', {zoomControl:false}).setView([47.57768554635565,-122.16660887002944], 13);

    var coordinate = {{list_latlong | tojson | safe}};
    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
        attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
    }).addTo(map);
    var logoIcon = L.icon({
        iconUrl: './static/picture.png',
        iconSize:     [22, 22], // size of the icon
        iconAnchor:   [11, 22], // point of the icon which will correspond to marker's location
    });

    var i;
    for (i = 0; i < coordinate.length; i++) {
        var point = coordinate[i]
        var text = "";
        text = "<dl><dt>Number: " + point[2] + "</dt>"
        + "<dt>" + point[5] + "</dt>"
        + "<dt>" + point[6] + ", " + point[7] + ", " + point[8] + "</dt>"
        +"</dl>"
        L.marker([point[3],point[4]], {icon: logoIcon}).bindPopup(text).addTo(map);
    }


</script>
</body>
</html>