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javascript - 如何删除openlayer中的特定标记

转载 作者：行者123 更新时间：2023-11-27 22:40:45 29 4
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这是来自 capdragon 的更新的新代码，但现在它不会创建标记。我现在不知道如何解决这个问题。我认为代码片段是解决我之前识别标记的问题的一种非常聪明的方法，它可能是我现在缺少的一个非常小的东西。再次提供任何帮助将不胜感激。

<title>Open Street Map</title>
        <style type="text/css">
        html, body, #demo {
        position: absolute;
        left: 2%;
        width = 25%
        }
        html, body, #activePlanes {
        position: absolute;
        left: 2%;
        width = 25%
        }
        html, body, #mapBox {
        position: fixed;
        top: 0;
        right: 0;
        width: 75%;
        height: 100%;
        }
        </style>

        <script src="http://www.openlayers.org/api/OpenLayers.js"></script>
        <script type="text/javascript">

        var arrMarkers = [];
        function AddPlaneMarker(planeID, lonlat)
        {
            var markers = new OpenLayers.Layer.Markers("Markers");
            map.addLayer(markers);
            var marker = new OpenLayers.Marker(lonlat);
            marker.PlaneID = planeID;
            markers.addMarker(marker);
            arrMarkers.push(marker);
        }

        function RemovePlaneMarker(planeID)
        {
            for(var x in arrMarkers)
            {
                if(arrMarkers[x].PlaneID == planeID)
                {
                    arrMarkers.splice(x, 1);
                    markers.removeMarker(arrMarkers[x]); 
                    return;
                }       
            }
        }  

        function GetPlaneMarker(planeID)
        {
            for(var x in arrMarkers)
            {
                if(arrMarkers[x].PlaneID == planeID)
                {
                    return arrMarkers[x];
                }       
            }
        }

        function displayPlane()
        {
            var x = document.getElementById('planeList');
            var newPlane = document.createElement('option');
            newPlane.text = document.getElementById("plane_ID").value;
            if (newPlane.text == null || newPlane.text == "")
            {
                alert("Please specify an Aircraft ID");
            }
            else
            {
                try
                {
                    x.add(newPlane, x.newPlane[null]); // standards compliant; doesn't work in IE
                }
                catch(e)
                {
                    x.add(newPlane, null); // IE only
                }
                var lonLat = new OpenLayers.LonLat(document.getElementById("long").value, document.getElementById("lat").value).transform(
                new OpenLayers.Projection("EPSG:4326"),
                map.getProjectionObject());
                var planeID = document.getElementById("plane_ID");
                AddPlaneMarker(planeID,lonLat);
            }
        }

        function init()
        {
            map = new OpenLayers.Map("mapBox");
            map.addLayer(new OpenLayers.Layer.OSM());
            focusPoint = new OpenLayers.LonLat(-81.04818, 29.18710)
            focusPoint.transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());
            map.setCenter(focusPoint, 14);
        }

        function newLonLat()
        {
            var newValues = prompt("Please specify new location of the Aircraft", "-81.07870 29.17210");
            var theValues = newValues.split(" ");
            var newPixel = map.getLayerPxFromViewPortPx(map.getPixelFromLonLat(new OpenLayers.LonLat(theValues[0], theValues[1]).transform(
            new OpenLayers.Projection("EPSG:4326"),
            map.getProjectionObject())));
            marker.moveTo(newPixel);
        }

        function removePlane()
        {
            var x=document.getElementById("planeList");
            x.remove(x.selectedIndex);
            var planeID = x.options[x.selectedIndex].text;
            RemovePlaneMarker(planeID);
        }
        </script>

        <body onload="init();">
        <div id="mapBox"></div>
        </body>
        <body>
        <br /><div id="demo">
        Aircraft ID: <input type="text" id="plane_ID" value="AA5024"/><br />
        Longitude: &nbsp;<input type="text" id="long" value="-81.04818" /><br />
        Latitude: &nbsp;&nbsp;&nbsp;&nbsp;<input type="text" id="lat" value="29.18710" /><br /><br />
        <dd>&nbsp;&nbsp;&nbsp;&nbsp;<button value="Add Aircraft" OnClick="displayPlane()">Add Aircraft</button></dd>
        <br /><br />
        <h3><dd>Active Planes</dd></h3>
        <select id="planeList" size="10" multiple="multiple" style="text-align:center" ondblclick="newLonLat()">
        <option>----------Plane ID----------</option>
        </select><br />
        <dd><button value="Remove Aircraft" OnClick="removePlane()">Remove Aircraft</button></dd>
        </div>
        </body>

最佳答案

markers和 marker看起来它们不在 removePlane() 的范围内可用.

尝试在全局范围内声明它们并删除 var当你实例化它们时:

<script type="text/javascript">
...
var markers, marker;
...
        function displayPlane()
             ...
             markers = new OpenLayers.Layer.Markers(name);
             ...
             marker = new OpenLayers.Marker(lonLat);
...

根据评论更新:

实际上我最喜欢我的最后一个选择

我会在我自己的 Plane 对象数组中跟踪它们，这些对象包含对标记的引用。像这样: 

​var arrPlaneObjects = []​;

function AddPlaneMarker(planeID, lonlat){

    var objPlane = {};
    objPlane.ID = planeID;
    objPlane.Marker = new OpenLayers.Marker(lonLat);
    //Add to layer.
    markers.addMarker(objPlane.Marker);
    //Add to array.
    arrPlaneObjects.push(objPlane);
}

function RemovePlaneMarker(planeID){
    for(var x in arrPlaneObjects){
        if(arrPlaneObjects[x].ID == planeID){
            //Remove from array.
            arrPlaneObjects.splice(x, 1);
            //Remove from layer.
            markers.removeMarker(arrPlaneObjects[x].Marker); 
            return;
        }       
    }
}

<罢工> 然后你可以使用它来轻松添加和删除标记:

AddPlaneMarker("AA5024", lonLat);

RemovePlaneMarker("AA2222");

另一种选择是只跟踪数组中的标记并将平面 ID 存储在该标记中，如下所示:

​var arrMarkers = []​;

function AddPlaneMarker(planeID, lonlat){

    var marker = new OpenLayers.Marker(lonLat);
    marker.PlaneID = planeID;
    //Add to layer.
    markers.addMarker(marker);
    //Add to array.
    arrMarkers.push(marker);
}

function RemovePlaneMarker(planeID){
    for(var x in arrMarkers){
        if(arrMarkers[x].PlaneID == planeID){

            //Remove from layer.
            markers.removeMarker(arrMarkers[x]); 
            //Remove from array.
            arrMarkers.splice(x, 1);
            return;
        }       
    }
}

稍后调用它们:

function GetPlaneMarker(planeID){
    for(var x in arrMarkers){
        if(arrMarkers[x].PlaneID == planeID){
            return arrMarkers[x];
        }       
    }
}

var myPlaneMarker = GetPlaneMarker("AA2222");

解决方案更新

<title>Open Street Map</title>
        <style type="text/css">
        html, body, #demo {
        position: absolute;
        left: 2%;
        width = 25%
        }
        html, body, #activePlanes {
        position: absolute;
        left: 2%;
        width = 25%
        }
        html, body, #mapBox {
        position: fixed;
        top: 0;
        right: 0;
        width: 75%;
        height: 100%;
        }
        </style>

        <script src="http://www.openlayers.org/api/OpenLayers.js"></script>
        <script type="text/javascript">

            var arrMarkers = [];
            var markers;

            function AddPlaneMarker(planeID, lonlat) {

                var marker = new OpenLayers.Marker(lonlat);
                marker.PlaneID = planeID;
                markers.addMarker(marker);
                arrMarkers.push(marker);

            }

            function RemovePlaneMarker(planeID) {
                for (var x in arrMarkers) {
                    if (arrMarkers[x].PlaneID == planeID) {

                        markers.removeMarker(arrMarkers[x]);
                        arrMarkers.splice(x, 1);

                        return;
                    }
                }
            }

            function GetPlaneMarker(planeID) {
                for (var x in arrMarkers) {
                    if (arrMarkers[x].PlaneID == planeID) {
                        return arrMarkers[x];
                    }
                }
            }

            function displayPlane() {
                var x = document.getElementById('planeList');
                var newPlane = document.createElement('option');
                newPlane.text = document.getElementById("plane_ID").value;
                if (newPlane.text == null || newPlane.text == "") {
                    alert("Please specify an Aircraft ID");
                }
                else {
                    try {
                        x.add(newPlane, x.newPlane[null]); // standards compliant; doesn't work in IE
                    }
                    catch (e) {
                        x.add(newPlane, null); // IE only
                    }
                    var lonLat = new OpenLayers.LonLat(document.getElementById("long").value, document.getElementById("lat").value).transform(
                new OpenLayers.Projection("EPSG:4326"),
                map.getProjectionObject());
                    var planeID = document.getElementById("plane_ID").value;
                    AddPlaneMarker(planeID, lonLat);
                }
            }

            function init() {
                map = new OpenLayers.Map("mapBox");
                map.addLayer(new OpenLayers.Layer.OSM());
                focusPoint = new OpenLayers.LonLat(-81.04818, 29.18710)
                focusPoint.transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());
                map.setCenter(focusPoint, 14);

                markers = new OpenLayers.Layer.Markers("Markers");
                map.addLayer(markers);
            }

            function newLonLat() {
                var newValues = prompt("Please specify new location of the Aircraft", "-81.07870 29.17210");
                var theValues = newValues.split(" ");
                var newPixel = map.getLayerPxFromViewPortPx(map.getPixelFromLonLat(new OpenLayers.LonLat(theValues[0], theValues[1]).transform(
            new OpenLayers.Projection("EPSG:4326"),
            map.getProjectionObject())));
                marker.moveTo(newPixel);
            }

            function removePlane() {
                var x = document.getElementById("planeList");
                var id = x.options[x.selectedIndex].value;
                x.remove(x.selectedIndex);
                RemovePlaneMarker(id);
            }
        </script>

        <body onload="init();">
        <div id="mapBox"></div>

        <br /><div id="demo">
        Aircraft ID: <input type="text" id="plane_ID" value="AA5024"/><br />
        Longitude: &nbsp;<input type="text" id="long" value="-81.04818" /><br />
        Latitude: &nbsp;&nbsp;&nbsp;&nbsp;<input type="text" id="lat" value="29.18710" /><br /><br />
        <dd>&nbsp;&nbsp;&nbsp;&nbsp;<button value="Add Aircraft" OnClick="displayPlane()">Add Aircraft</button></dd>
        <br /><br />
        <h3><dd>Active Planes</dd></h3>
        <select id="planeList" size="10" multiple="multiple" style="text-align:center" ondblclick="newLonLat()">
        <option>----------Plane ID----------</option>
        </select><br />
        <dd><button value="Remove Aircraft" OnClick="removePlane()">Remove Aircraft</button></dd>
        </div>
        </body>

关于javascript - 如何删除openlayer中的特定标记，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11040312/

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