Leaflet 未捕获的TypeError:_arc2.default.GreatCircle不是构造函数
正在尝试为react传单创建插件。我在工作时遇到了这个错误 我回来了 L.Polyline.Arc(位置.from,位置.to,选项) 这是我的组件Leaflet 未捕获的TypeError:_arc2.default.GreatCircle不是构造函数,leaflet,automatic-ref-counting,react-leaflet,Leaflet,Automatic Ref Counting,React Leaflet,正在尝试为react传单创建插件。我在工作时遇到了这个错误 我回来了 L.Polyline.Arc(位置.from,位置.to,选项) 这是我的组件 import React, { PropTypes } from 'react'; import { Path } from 'react-leaflet'; import L from 'leaflet' import { Arc } from './leaflet.arc'; export default class ArcLine ext
import React, { PropTypes } from 'react';
import { Path } from 'react-leaflet';
import L from 'leaflet'
import { Arc } from './leaflet.arc';
export default class ArcLine extends Path {
static propTypes = {
children: PropTypes.oneOfType([
PropTypes.arrayOf(PropTypes.node),
PropTypes.node,
]),
option:PropTypes.object,
position: PropTypes.object.isRequired
};
createLeafletElement (props) {
const { position, option, ...options } = props
return L.Polyline.Arc(position.from, position.to, option)
}
updateLeafletElement (fromProps, toProps) {
if (toProps.position !== fromProps.position) {
this.leafletElement._createLatLngs(line, toProps.position.from)
}
this.setStyleIfChanged(fromProps, toProps)
}
}
/传单.arc是
import arc from 'arc';
/**
* Transform L.LatLng to {x, y} object
* @param {L.LatLng} latlng
* @returns {{x: {number}, y: {number}}}
* @private
*/
const _latLngToXY = latlng => ({
x: latlng.lng,
y: latlng.lat
});
/**
* Create array of L.LatLng objects from line produced by arc.js
* @param {object} line
* @param {L.LatLng} from
* @private
* @returns {Array}
*/
function _createLatLngs(line, from) {
if (line.geometries[0] && line.geometries[0].coords[0]) {
/**
* stores how many times arc is broken over 180 longitude
* @type {number}
*/
let wrap = from.lng - line.geometries[0].coords[0][0] - 360;
return line.geometries
.map(subLine => {
wrap += 360;
return subLine.coords.map(point => L.latLng([point[1], point[0] + wrap]));
})
.reduce((all, latlngs) => all.concat(latlngs));
} else {
return [];
}
}
if (!L) {
throw "Leaflet.js not included";
} else if (!arc && !arc.GreatCircle) {
throw "arc.js not included";
} else {
L.Polyline.Arc = function (from, to, options) {
from = L.latLng(from);
to = L.latLng(to);
debugger
var vertices = 10;
var arcOptions = {};
if (options) {
if (options.offset) {
arcOptions.offset = options.offset;
delete options.offset;
}
if (options.vertices) {
vertices = options.vertices;
delete options.vertices;
}
}
var generator = new arc.GreatCircle({x: from.lng, y: from.lat}, {x: to.lng, y: to.lat});
var line = generator.Arc(vertices, arcOptions);
var latLngs = [];
var wrap = 0; // counts how many times arc is broken over 180 degree
if (line.geometries[0] && line.geometries[0].coords[0])
wrap = from.lng - line.geometries[0].coords[0][0];
line.geometries.forEach(function(line) {
line.coords.forEach(function (point) {
latLngs.push(L.latLng(
[point[1], point[0] + wrap]
));
});
wrap += 360;
});
line.geometries[0].coords
return L.polyline(latLngs, options);
};
}
为什么我会遇到这个错误,有什么建议吗?在这行:
import { Arc } from './leaflet.arc'
…您正试图从传单.Arc
文件导入Arc变量。但是,在传单.arc
文件中,看起来您并没有导出任何内容,只需将arc函数附加到传单的多段线对象。此外,在组件中的代码中,您甚至没有使用要导入的Arc
变量。因此,代码失败,因为试图从spoolet.arc
的未定义导出读取属性。似乎您应该只导入文件而不尝试导入任何对象
TLDR:
替换此行:
import { Arc } from './leaflet.arc'
为此:
import './leaflet.arc'
我也试过了,但同样的错误。使用调试器时,我的代码正在工作,数据会按我看到的那样传递,但当var generator=new arc.GreatCircle({x:from.lng,y:from.lat},{x:to.lng,y:to.lat})时,数据会停止传递;如果(!arc&&!arc.GreatCircle){尝试将这一行更改为:
}如果(!arc | |!arc.GreatCircle){
在您的传单.arc文件中。它表示未包含Uncaught arc.js,并且带有console.log(arc)我得到一个空对象。但我已经包含了arc。您是否在package.json中包含了arc并安装了它?是的,我使用了npm安装--save arc,在packge json中我得到了依赖项“arc”:“^0.1.0”