[英]How to remove feature on right click in openlayers 5
我在 openlayers 的地圖上有一個功能,我的要求是允許用戶通過右鍵單擊刪除該功能。
這是參考屏幕截圖:
當用戶單擊“刪除”時,應刪除該功能。 如果用戶在右鍵單擊功能后單擊其他位置,“刪除”菜單應該消失。
您將需要覆蓋默認內容菜單並添加您自己的內容菜單。 添加偵聽器以在視圖更改、用戶按下 esc 鍵等時將其關閉。添加此代碼適用於您的示例:
var contextMenu = document.createElement('div');
contextMenu.id = "contextMenu"
contextMenu.dir = "ltr";
contextMenu.className = "contextMenu";
contextMenu.style.position = "absolute";
contextMenu.style.left = "0px";
contextMenu.style.top = "0px";
contextMenu.style.display = "none";
map.getViewport().appendChild(contextMenu);
contextMenu.innerHTML =
'<div id="contextMenuRemove" class="menuItem" onclick="removeFeature();"> Remove </div>';
var mouseOver = false;
function hideContextMenu() {
contextMenu.style.display = "none";
}
map.on('click', hideContextMenu);
map.getView().on('change', function () {
if (contextMenu.style.display != "none") {
setTimeout(hideContextMenu, 250); // delay reset until map singleclick event has fired
}
});
contextMenu.addEventListener('contextmenu', function (e) {
e.preventDefault();
});
document.addEventListener('keydown', function (e) {
if (e.keyCode == 27) {
hideContextMenu();
}
});
function openContextMenu(x, y) {
contextMenu.style.right = "";
contextMenu.style.bottom = "";
contextMenu.style.left = x + "px";
contextMenu.style.top = y + "px";
contextMenu.style.display = "block";
}
var canvas = map.getViewport().getElementsByTagName("canvas")[0];
var features;
canvas.addEventListener('contextmenu', function (e) {
features = map.getFeaturesAtPixel([e.x, e.y]);
if (features) {
e.preventDefault();
openContextMenu(e.x, e.y);
}
});
function removeFeature() {
source.removeFeature(features[0]);
}
這是我用於上下文菜單的樣式(在您的情況下沒有禁用條目或分隔符)
.contextMenu {
background-color: #eee;
position: absolute;
border: solid 1px black;
width: 100px;
}
.contextMenu .menuItem {
cursor: pointer;
padding: 5px;
}
.contextMenu .disabled {
color: #aaa;
pointer-events: none;
cursor: none;
}
.contextMenu .menuItem:hover {
background-color: #ccc;
}
.menuSeparator {
border-bottom: solid 1px black;
}";
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