Javascript 使用自定义按钮扩展L.control.zoom
我正在寻找向Javascript 使用自定义按钮扩展L.control.zoom,javascript,inheritance,leaflet,overriding,extends,Javascript,Inheritance,Leaflet,Overriding,Extends,我正在寻找向L.control.zoom添加额外按钮的方法。传单是从CDN加载的,我使用的是香草Javascript(没有预处理器或任何东西) 我希望会有类似于L.control.zoom.extend({})的东西,但不幸的是这并不存在。尝试L.Control.extend({…L.Control.zoom})也不起作用 对于上下文,通过复制粘贴并在第42行添加“我的自定义”按钮的代码来执行此操作的过程如下所示: let zoomControls = L.Control.extend({
L.control.zoom
添加额外按钮的方法。传单是从CDN加载的,我使用的是香草Javascript(没有预处理器或任何东西)
我希望会有类似于L.control.zoom.extend({})
的东西,但不幸的是这并不存在。尝试L.Control.extend({…L.Control.zoom})
也不起作用
对于上下文,通过复制粘贴并在第42行添加“我的自定义”按钮的代码来执行此操作的过程如下所示:
let zoomControls = L.Control.extend({
// @section
// @aka Control.Zoom options
options: {
position: 'topleft',
// @option zoomInText: String = '+'
// The text set on the 'zoom in' button.
zoomInText: '+',
// @option zoomInTitle: String = 'Zoom in'
// The title set on the 'zoom in' button.
zoomInTitle: 'Zoom in',
// @option zoomOutText: String = '−'
// The text set on the 'zoom out' button.
zoomOutText: '−',
// @option zoomOutTitle: String = 'Zoom out'
// The title set on the 'zoom out' button.
zoomOutTitle: 'Zoom out'
},
onAdd: function (map) {
var zoomName = 'leaflet-control-zoom',
container = L.DomUtil.create('div', zoomName + ' leaflet-bar'),
options = this.options;
let locationLink = L.DomUtil.create('a', 'leaflet-bar-part leaflet-bar-part-single', container);
L.DomEvent.disableClickPropagation(locationLink);
locationLink.title = 'My location';
let locationIcon = L.DomUtil.create('span', 'fa-lg fas fa-map-marker-alt', locationLink);
L.DomEvent.on(locationLink, 'click', () => {
alert('BUTTON CLICKED');
});
this._zoomInButton = this._createButton(options.zoomInText, options.zoomInTitle,
zoomName + '-in', container, this._zoomIn);
this._zoomOutButton = this._createButton(options.zoomOutText, options.zoomOutTitle,
zoomName + '-out', container, this._zoomOut);
this._updateDisabled();
map.on('zoomend zoomlevelschange', this._updateDisabled, this);
return container;
},
onRemove: function (map) {
map.off('zoomend zoomlevelschange', this._updateDisabled, this);
},
disable: function () {
this._disabled = true;
this._updateDisabled();
return this;
},
enable: function () {
this._disabled = false;
this._updateDisabled();
return this;
},
_zoomIn: function (e) {
if (!this._disabled && this._map._zoom < this._map.getMaxZoom()) {
this._map.zoomIn(this._map.options.zoomDelta * (e.shiftKey ? 3 : 1));
}
},
_zoomOut: function (e) {
if (!this._disabled && this._map._zoom > this._map.getMinZoom()) {
this._map.zoomOut(this._map.options.zoomDelta * (e.shiftKey ? 3 : 1));
}
},
_createButton: function (html, title, className, container, fn) {
var link = L.DomUtil.create('a', className, container);
link.innerHTML = html;
link.href = '#';
link.title = title;
/*
* Will force screen readers like VoiceOver to read this as "Zoom in - button"
*/
link.setAttribute('role', 'button');
link.setAttribute('aria-label', title);
L.DomEvent.disableClickPropagation(link);
L.DomEvent.on(link, 'click', L.DomEvent.stop);
L.DomEvent.on(link, 'click', fn, this);
L.DomEvent.on(link, 'click', this._refocusOnMap, this);
return link;
},
_updateDisabled: function () {
var map = this._map,
className = 'leaflet-disabled';
L.DomUtil.removeClass(this._zoomInButton, className);
L.DomUtil.removeClass(this._zoomOutButton, className);
if (this._disabled || map._zoom === map.getMinZoom()) {
L.DomUtil.addClass(this._zoomOutButton, className);
}
if (this._disabled || map._zoom === map.getMaxZoom()) {
L.DomUtil.addClass(this._zoomInButton, className);
}
}
});
让ZoomControl=L.Control.extend({
//@节
//@aka Control.Zoom选项
选项:{
位置:'左上',
//@option zoomInText:String='+'
//“放大”按钮上设置的文本。
zoomInText:“+”,
//@option zoomInTitle:String='Zoom-in'
//“放大”按钮上设置的标题。
ZoomMinTitle:“放大”,
//@option zoomOutText:String='−;'
//“缩小”按钮上设置的文本。
zoomOutText:“−;”,
//@option zoomoutittle:String='缩小'
//“缩小”按钮上设置的标题。
Zoomoutittle:“缩小”
},
onAdd:函数(映射){
var zoomName=‘传单控制缩放’,
container=L.DomUtil.create('div',zoomName+'传单栏'),
options=this.options;
让locationLink=L.DomUtil.create('a','传单栏部分传单栏部分',容器);
L.DomEvent.disableClickPropagation(locationLink);
locationLink.title='我的位置';
让locationIcon=L.DomUtil.create('span','fa lg fas fa map marker alt',locationLink);
L.DomEvent.on(locationLink,'单击',()=>{
警报(“点击按钮”);
});
this.\u zoomInButton=this.\u createButton(options.zoomInText,options.zoomInTitle,
zoomName+'-in',容器,此。_zoomIn);
this.\u zoomOutButton=this.\u createButton(options.zoomOutText,options.zoomOutTitle,
zoomName+'-out',容器,此;
此。_updateSabled();
地图上('ZoomMend zoomlevelschange',this.\u updateDisabled,this);
返回容器;
},
onRemove:函数(映射){
map.off('zoomendZoomlevelschange',this.\u updateDisabled,this);
},
禁用:函数(){
此项。_disabled=true;
此。_updateSabled();
归还这个;
},
启用:函数(){
此项。_disabled=false;
此。_updateSabled();
归还这个;
},
_缩放:功能(e){
如果(!this.\u已禁用&&this.\u映射.\u缩放this._映射.getMinZoom()){
this._map.zoomOut(this._map.options.zoomDelta*(e.shiftKey?3:1));
}
},
_createButton:函数(html、标题、类名、容器、fn){
var link=L.DomUtil.create('a',className,container);
link.innerHTML=html;
link.href='#';
link.title=标题;
/*
*将迫使像VoiceOver这样的屏幕阅读器将其读为“放大-按钮”
*/
link.setAttribute('role','button');
link.setAttribute('aria-label',title);
L.DomEvent.disableClickPropagation(链接);
L.DomEvent.on(链接“单击”,L.DomEvent.stop);
L.DomEvent.on(链接“点击”,fn,本);
L.DomEvent.on(链接“单击”,此.\u重新聚焦地图,此);
返回链接;
},
_updateSabled:函数(){
var map=此。_map,
className=‘传单已禁用’;
L.DomUtil.removeClass(this.\u zoomInButton,className);
L.DomUtil.removeClass(this._zoomOutButton,className);
如果(此.| | |映射._zoom===map.getMinZoom()){
L.DomUtil.addClass(this._zoomOutButton,className);
}
如果(此.|禁用| |映射._缩放===map.getMaxZoom()){
L.DomUtil.addClass(this.\u zoomInButton,className);
}
}
});
虽然传单中没有明确说明,但工厂和类之间存在微妙的区别,前者是小写的,不能扩展;后者是PASCALCA的,可以在其上使用传单扩展
机制:
var MyNewZoomControl=L.Control.Zoom.extend({
onAdd:函数(映射){
//你的新方法内容
}
}
也就是说,如果你的新按钮没有真正与缩放按钮共享功能,或者没有与它们“合并”,你可以简单地制作一个单独的控件并将其插入到相同的角落位置。还有一个传单EasyButton插件可以在这方面提供帮助