英文:
How to select features via attribute property values
问题
我正在使用 OpenLayers 7.3，并尝试基于属性值选择 GeoJSON 矢量图层的要素。我尝试使用 Select 类与过滤器，但无法使其正常工作。我只需从地图上方的按钮运行一些预设的查询；例如，选择所有带有 "[fid] > 5" 的要素：
var selectAttributes = new Select({
layers: [VectorLayer],
filter: new GreaterThan({propertyName: 'fid', expression: 5}),
});
有办法做到这一点吗？我已经阅读了早期 OL 版本的方法，但没有找到适用的方法。我尝试了非常好用的 ol-ext Select 控件，它让我对 7.3 版本有了一些希望，但我不能使用控件，只需要有一些允许用户通过单击按钮运行并查看选择结果的东西。感谢任何帮助。
英文:
I'm using OpenLayers 7.3 and am trying to select features of a GeoJSON vector layer based on attribute values. I've tried using the Select Class with filters but haven't been able to get it to work. I just need to run some preset queries from the button above the map; for example, select all with "[fid] > 5":
var selectAttributes = new Select({
layers: [VectorLayer],
filter: new GreaterThan({propertyName: 'fid', expression: 5}),
});
Is there a way to do this? I've read about approaches from earlier OL versions but haven't found anything that works well. I've tried the very nice ol-ext Select control, which gives me hope this type of selection is possible at 7.3, but I can't use a control and just need to have something that allows the user to run and see the results of the selection from a single button push. Thanks for any help.
答案1
得分: 0
如Mike在上面的评论中所说：
> Select是为用户交互而设计的，但您可以像在codesandbox.io/s/modify-features-forked-3u6thw?file=/main.js中一样填充其功能集合。
英文:
As Mike said in the comments above:
>Select is intended for user interactions but you can populate its feature collection as in codesandbox.io/s/modify-features-forked-3u6thw?file=/main.js
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