我在两个树的displayLevels中显示Basemap上的信息时遇到问题。 我有一个受这个esri示例启发的程序：https://developers.arcgis.com/javascript/jssamples/data_gas_prices.html
在此之后我构建了自己的zoomLevels或显示Levels，因为我只需要三个。 我的问题是我想在我的featureLayer中只有三个zoomLevels文本中的两个，我不知道如何做到这一点。我在互联网上找到的唯一示例是此示例表格Esri：https://developers.arcgis.com/javascript/jssamples/map_switch_layer_on_zoom.html
但他们使用ArcGISTiledMapServiceLayer而我不是。
那么请有人告诉我这个问题的解决方案吗？
以下是代码：
define([
"dojo/_base/declare",
"dojo/_base/array",
"esri/map",
"esri/graphic",
"esri/lang",
"esri/geometry/Extent",
"esri/symbols/SimpleLineSymbol",
"esri/symbols/SimpleFillSymbol",
"esri/renderers/SimpleRenderer",
"esri/renderers/ClassBreaksRenderer",
"esri/symbols/Font",
"esri/symbols/TextSymbol",
"esri/layers/FeatureLayer",
"esri/dijit/Legend",
"esri/dijit/OverviewMap",
"esri/InfoTemplate",
"esri/request",
"modules/mapTip",
"dijit/TooltipDialog",
"dijit/popup",
"dojo/json",
"dojo/store/JsonRest",
"dojo/_base/array",
"dojo/parser",
"dojo/_base/connect",
"dojo/_base/Color",
"dojo/number",
"dojo/dom",
"dojo/dom-construct",
"dojo/dom-style",
"dijit/form/Button",
"dijit/layout/BorderContainer",
"dijit/layout/ContentPane",
"dijit/layout/AccordionContainer",
"dojo/domReady!"
], function(
declare,array, Map, Graphic, esriLang, Extent, SimpleLineSymbol, SimpleFillSymbol, SimpleRenderer,
ClassBreaksRenderer, Font, TextSymbol,FeatureLayer, Legend, OverviewMap, InfoTemplate, esriRequest,Tip,
TooltipDialog, dijitPopup,JSON, JsonRest, arr, parser, conn, Color, number, dom, domConstruct, domStyle, Button) {
return declare (null, {
init: function (){
var lods = [
//{"level" : 1, "resolution" : 78271.5169639999, "scale" : 295828763.795777},
//{"level" : 2, "resolution" : 39135.7584820001, "scale" : 147914381.897889},
//{"level" : 3, "resolution" : 19567.8792409999, "scale" : 73957190.948944},
//{"level" : 4, "resolution" : 9783.93962049996, "scale" : 36978595.474472},
//{"level" : 5, "resolution" : 4891.96981024998, "scale" : 18489297.737236},
//{"level" : 6, "resolution" : 2445.98490512499, "scale" : 9244648.868618},
{"level" : 7, "resolution" : 1222.99245256249, "scale" : 4622324.434309},
//{"level" : 8, "resolution" : 611.49622628138, "scale" : 2311162.217155},
//{"level" : 9, "resolution" : 305.748113140558, "scale" : 1155581.108577},
{"level" : 10, "resolution" : 152.874056570411, "scale" : 577790.554289},
//{"level" : 11, "resolution" : 76.4370282850732, "scale" : 288895.277144},
{"level" : 12, "resolution" : 38.2185141425366, "scale" : 144447.638572},
//{"level" : 13, "resolution" : 19.1092570712683, "scale" : 72223.819286},
//{"level": 14, "resolution": 9.55462853563415, "scale": 36111.909643},
//{"level": 15, "resolution": 4.77731426794937, "scale": 18055.954822},
//{"level": 16, "resolution": 2.38865713397468, "scale": 9027.977411},
//{"level": 17, "resolution": 1.19432856685505, "scale": 4513.988705}
];
var fl = new FeatureLayer("someServer/arcgis/rest/services/someProject/FeatureServer/1", {
mode: FeatureLayer.MODE_SNAPSHOT,
displayLevels:[0,1],
outFields:["*"],
//infoTemplate: template,
visible: true,
value: "OBJECTID",
});
window.map = new Map("map", {
basemap:"topo",
center: [48.04, 28.50],
zoom: 0,
lods: lods,
});
var overviewMapDijit = new OverviewMap({
map: window.map,
visible: true
});
overviewMapDijit.startup();
var updateEnd = fl.on("update-end", function() {
updateEnd.remove();
updateRenderer();
updateLables();
});
window.map.addLayers([fl]);
function updateRenderer(){
fl.setRenderer(new SimpleRenderer(null));
var kachelnamen = new JsonRest({
target: "someTargetURL",
idAttribute: "WA",
headers: { "X-Requested-With": "" },
});
kachelnamen.query(null).then(drawFeatureLayer, kachelnamenError);
console.debug(kachelnamen);
console.info(kachelnamen);
}
////////////////////////////////////////////////
function updateLables(){
var font = new Font("11px", Font.STYLE_NORMAL, Font.VARIANT_NORMAL, Font.WEIGHT_BOLDER);
arr.forEach(fl.graphics, function(graphic){
var centerPoint;
switch (graphic.geometry.type) {
case "point":
centerPoint = graphic.geometry;
break;
case "extent":
centerPoint = graphic.getCenter();
default:
centerPoint = graphic._extent.getCenter();
}
var textSymbol = new TextSymbol(graphic.attributes.NAME,font, new Color([0, 0, 0]));
var labelPointGraphic = new Graphic(centerPoint, textSymbol);
window.map.graphics.add(labelPointGraphic);
});
}
///////////////////////////////////////////////////////////
function drawFeatureLayer(data) {
// data comes back as text from apify...parse it
// loop through gas price data, find min/max and populate an object
// to keep track of the price of regular in each state
window.statekachelnamen = {};
var gasMin = Infinity;
var gasMax = -Infinity;
arr.forEach(data, function(g) {
var price = parseFloat(g.STAT_CALC);
statekachelnamen[g.WA] = price;
if ( price < gasMin ) {
gasMin = price;
}
if ( price > gasMax ) {
gasMax = price;
}
});
// format max gas price with two decimal places
gasMax = formatDollars(gasMax);
// add an attribute to each attribute so gas price is displayed
// on mouse over below the legend
arr.forEach(fl.graphics, function(g) {
//var displayValue = statekachelnamen[g.attributes.WA_NAME].toFixed(2);
var displayValue;
if (g.attributes.WA_NAME in statekachelnamen){
displayValue = statekachelnamen[g.attributes.WA_NAME].toFixed(2);
}
else{
displayValue = 0;
}
g.attributes.STAT_CALC = displayValue;
});
// create a class breaks renderer
var breaks = calcBreaks(gasMin, gasMax, 4);
//gasMax = formatDollars(gasMax);
// console.log("gas price breaks: ", breaks);
var sfs = SimpleFillSymbol;
var sls = SimpleLineSymbol;
var outline = sls("solid", new Color("#444"), 1);
var br = new ClassBreaksRenderer(null, findGasPrice);
br.setMaxInclusive(true);
br.addBreak(breaks[0], breaks[1], new sfs("solid", outline, new Color([255, 255, 178, 0.75])));
br.addBreak(breaks[1], breaks[2], new sfs("solid", outline, new Color([254, 204, 92, 0.75])));
br.addBreak(breaks[2], breaks[3], new sfs("solid", outline, new Color([253, 141, 60, 0.75])));
br.addBreak(breaks[3], gasMax, new sfs("solid", outline, new Color([227, 26, 28, 0.75])));
fl.setRenderer(br);
fl.redraw();
var legend2 = new Legend({
map: window.map,
layerInfos: [{ "layer": fl, "title": "WA Statistic" }]
},"legendDiv2");
legend2.startup();
// remove the loading div
//domConstruct.destroy("loading");
}
// function used by the class breaks renderer to get the
// value used to symbolize each state
function findGasPrice(graphic) {
var state = graphic.attributes.WA_NAME;
return statekachelnamen[state];
console.info(state);
}
function calcBreaks(min, max, numberOfClasses) {
var range = (max - min) / numberOfClasses;
var breakValues = [];
for ( var i = 0; i < numberOfClasses; i++ ) {
breakValues[i] = formatDollars(min + ( range * i ));
}
// console.log("break values: ", breakValues)
return breakValues;
}
var myButton = new Button({
label: "Update Renderer!",
onClick: function(){
updateRenderer();
}
}, "progButtonNode");
function formatDollars(num) {
return num.toFixed(2);
//return number.format(num, { "places": 2 });
}
function kachelnamenError(e) {
console.log("error getting gas price data: ", e);
}
}
});
});
![here the text is correct][1]
![here the text is correct too ][2]
![I don't want to display text here][3]
答案 0 :(得分：0)
好的，我找到了解决问题的方法。 这是它
window.map.addLayers([fl]);
var updateEnd = fl.on("update-end", function() {
updateEnd.remove();
updateRenderer();
updateLables();
//show or hide the SWA text when the map's extent changes
window.map.on("extent-change", function(evt) {
var currentScale = map.getScale();
console.log('maponScale: ' + currentScale);
if (currentScale.toString() == "4622324.434309"){
window.map.graphics.hide();
}
else{
window.map.graphics.show();
}
});
});