Openlayers:以编程方式从GeoJson中选择一个要素 [英] Openlayers: select a feature programmatically from GeoJson

问题描述

我正在一个使用openlayers(版本2.14)显示Bing层(GeoJSON格式)的项目中，读取GeoJSON和显示要素没有问题，但是我想以编程方式选择一个要素，例如，有一个显示所有要素属性的表格(GeoJSON format.sample:

I am working on a project that uses openlayers (version2.14)to display a Bing layer(GeoJSON format), I have no problem reading the GeoJSON and display features, but I want to select a feature programmatically, for example, there is a table displaying all the features attributes(GeoJSON format.sample:

{"type":"FeatureCollection"， "features":[{"type":"Feature"，"properties":{}，"geometry":{"type":"Point"，"coordinates":[-7923751.4232522,5233536.7371399]}，"crs": {"type":名称"，属性":{名称":"ur:ogc:def:crs:OGC:1.3:CRS84"}}} ]，}

{"type": "FeatureCollection", "features": [ {"type":"Feature","properties":{},"geometry":{"type":"Point","coordinates":[-7923751.4232522,5233536.7371399]},"crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}}} ], }

)，当我单击表格中的一行时，我想使用该行中的GEOJSON数据在地图上选择或突出显示特定地图项.

), when I click a row from the table, I want to select or highlight a specific feature on the map using the GEOJSON data in that row.

我该怎么做?

谢谢

推荐答案

您可以使用方法"getFeaturesByAttribute"

You could use the method "getFeaturesByAttribute"

或遍历所有功能:

 for(var i = 0; i < yourgeojsonlayer.features.length; i++) { 
    if(yourgeojsonlayer.features[i].attributes.searchedAttribute == 'searchedValue')
     { selectFeatureControl.select(yourgeojsonlayer.features[i]); break; } 
    }

Ps:必须首先创建一个选择控件并分配您在for循环中使用的变量名(此处为selectFeatureControl)

Ps: makes necessary to create a select control first and assign the variable name you use in the for loop (here selectFeatureControl)

在此处查看我的示例: http://jsfiddle.net/expedio/sh9wv4m7/和 http://jsfiddle.net/3p5q0ybh/

See my examples here: http://jsfiddle.net/expedio/sh9wv4m7/ and http://jsfiddle.net/3p5q0ybh/

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