From 2a7a840c25fcdb1653538514fb6609b0dea61b66 Mon Sep 17 00:00:00 2001
From: Hsieh Chin Fan <pham@topo.tw>
Date: Fri, 11 Oct 2024 15:17:25 +0800
Subject: feat: add handler for invlid coordinates

* prvent default onmouseover/onclick handler
* set bg-color of GeoLink as gray
* add title to suggest another CRS
---
 src/dumbymap.mjs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/dumbymap.mjs')

diff --git a/src/dumbymap.mjs b/src/dumbymap.mjs
index 6602f29..974d4a3 100644
--- a/src/dumbymap.mjs
+++ b/src/dumbymap.mjs
@@ -179,7 +179,7 @@ export const generateMaps = (container, {
 
   /** Set CRS and GeoLinks */
   register(proj4)
-  fromEPSGCode(crs).then(() => {
+  fromEPSGCode(crs).then(projection => {
     const transform = proj4(crs, 'EPSG:4326').forward
 
     Array.from(container.querySelectorAll(geoLinkSelector))
@@ -200,6 +200,13 @@ export const generateMaps = (container, {
         params.set('q', `${lat},${lon}`)
         link.search = params
 
+        if (projection.getUnits() === 'degrees' &&
+          (lon > 180 || lon < -180 || lat > 90 || lat < -90)
+        ) {
+          link.dataset.valid = false
+          link.title = `Invalid Coordinate, maybe try another crs other than ${crs}`
+        }
+
         return link
       })
       .forEach(utils.createGeoLink)
-- 
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