Baidu Map API local search and range search_javascript skills

Map service refers to an interface that can provide data information, such as local search/route planning, etc. The editor below will sort out the local search and range search of Baidu Map API. Please see below for details.

Map Service Overview
Map services refer to interfaces that provide data information, such as local search, route planning, etc. The services provided by Baidu Map API are:

LocalSearch: Local search, providing location search services in a specific area, such as searching for "park" in Beijing.
TransitRoute: Bus navigation, providing search services for bus travel plans in a specific area.
DrivingRoute: Driving navigation, providing search services for driving travel plans.
WalkingRoute: Walking navigation, providing search services for walking travel plans.
Geocoder: Address parsing, providing services for converting address information into coordinate point information.
LocalCity: Local city, providing a service to automatically determine the city where you are.
TrafficControl: Real-time traffic control, providing real-time and historical traffic information services.
The service interface of the search class needs to specify a search range, otherwise the interface will not work.

Local Search
BMap.LocalSearch provides local search services. When using local search, you need to set a search area for it. The search area can be a BMap.Map object, a BMap.Point object or a string of province or city names (for example: "Beijing City") . The second parameter of the BMap.LocalSearch constructor is optional, in which you can specify the rendering of the results. The BMap.RenderOptions class provides several properties that control rendering, where map specifies the map instance where the results are displayed, and panel specifies the container element of the result list.

Copy code The code is as follows:

var map = new BMap.Map("container"); 
map.centerAndZoom(new BMap.Point(116.404, 39.915), 11); 
var local = new BMap.LocalSearch(map, { 
renderOptions:{map: map}
}); 
local.search("Tiananmen");

In addition, BMap.LocalSearch also provides searchNearby and searchInBounds methods to provide you with surrounding search and range search services.

Configure search

BMap.LocalSearch provides several configuration methods through which you can customize the behavior of the search service to meet your needs. In the example below, we adjust each page to display 8 results, and automatically adjust the map field of view according to the position of the result point, without displaying the information window of the first result:

Copy code The code is as follows:

var map = new BMap.Map("container");
map.centerAndZoom(new BMap.Point(116.404, 39.915), 14);
var local = new BMap.LocalSearch("Beijing",
                   {renderOptions: {map: map,autoViewport: true},pageCapacity: 8});                         local.search("Zhongguancun");

Results panel
By setting the BMap.LocalSearchOptions.renderOptions.panel property, you can provide a result list container for the local search object, and the search results will be automatically added to the container element. Please see the example below:

Copy code The code is as follows:

var map = new BMap.Map("container");
map.centerAndZoom(new BMap.Point(116.404, 39.915), 11);
var local = new BMap.LocalSearch(map,
                  {renderOptions: {map: map,panel: "results"});                                                     local.search("Zhongguancun");

Data interface

In addition to search results being automatically added to maps and lists, you can also obtain detailed data information through the data interface. Combined with the map API, you can add labels and information windows to the map yourself. The BMap.LocalSearch and BMap.LocalSearchOptions classes provide several interfaces for setting callback functions, through which the data information of the search results can be obtained. For example, the BMap.LocalResult object instance can be obtained through the onSearchComplete callback function parameter, which contains the data information of each search result. When the callback function is executed, you can use the BMap.LocalSearch.getStatus() method to confirm whether the search was successful or to get error details.

In the following example, the title and address information of each result on the first page are obtained through the onSearchComplete callback function and output to the page:

Copy code The code is as follows:

var map = new BMap.Map("container"); map.centerAndZoom(new BMap.Point(116.404, 39.915), 11); 
var options = { 
          onSearchComplete: function(results){                                        if (local.getStatus() == BMAP_STATUS_SUCCESS){                                                                                                                                                                                                                                                                                                    // Determine whether the status is correct                     var s = [];                                  for (var i = 0; i < results.getCurrentNumPois(); i ){
                       s.push(results.getPoi(i).title ", " " results.getPoi(i).address);                                                                                                                     document.getElementById("log").innerHTML = s.join("
");
                                                                                                                                        };  
var local = new BMap.LocalSearch(map, options); 
local.search("park");




Search nearby


With the nearby search service, you can search near a certain location or around a specific result point.

The following example shows how to search for snacks near the front door:

Copy code

The code is as follows:

var map = new BMap.Map("container"); map.centerAndZoom(new BMap.Point(116.404, 39.915), 11);  var local = new BMap.LocalSearch(map,                       { renderOptions:{map: map, autoViewport: true}});                                                                     local.searchNearby("snack", "front door");

Rectangular range search


Rectangular range search will provide search results based on the field of view you provide. Note: When the search scope is too large, there may be no results.

The following example shows how to search for banks within the current map field of view:

Copy code

The code is as follows:

var map = new BMap.Map("container");    

map.centerAndZoom(new BMap.Point(116.404, 39.915), 14); 

var local = new BMap.LocalSearch(map,                                                                                                                                       { renderOptions:{map: map}});                                        local.searchInBounds("Bank", map.getBounds());

Rectangular area search example

Rendering:

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