javascript - 在 Drupal Gmap map 上添加事件监听器时遇到问题

Question

我正在尝试编写一个 Drupal 模块，将 UTM 坐标字段添加到位置表单中，以便它们能够与 GMap map 以及纬度和经度字段正确交互 - 即，当单击 map 时， UTM 坐标与纬度/经度坐标一起进行计算和填充，如果通过在字段中键入来更改纬度/经度坐标，则 UTM 坐标以及 map 也会发生变化，反之亦然。

除了点击 map 之外，我已经完成了翻译和其他所有工作。我正在尝试向 map 添加一个监听器，以便在单击它时，将在纬度/经度字段上触发更改事件，从而触发 UTM 字段的更新。但是，我似乎无法让监听器工作。这是我到目前为止所拥有的(这是我的模块的 js 文件的片段，location_utm.js):

$(document).ready(function() {
    var themap = document.getElementById("gmap-auto1map-gmap0");

    Drupal.gmap.addHandler('gmap', function (themap) {
      var obj = this;

      var clickListener = GEvent.addListener(obj, "click", function() {           

         /* when the map gets clicked, trigger change event on the lat/long 
          fields so that the utm fields get updated too.   */
         $('#gmap-auto1map-locpick_longitude0').change();
         $('#gmap-auto1map-locpick_latitude0').change();



      });
   });
});

我已经尝试了这段代码的许多不同的细微变化，但似乎无法得到正确的结果。我很感激任何建议。

Answer 1

请查看代码注释:

if (GBrowserIsCompatible()) 
{
  Drupal.gmap.addHandler('gmap', function(elem, context) {
    var gmap = this;

    // Note: GMap module does not support solely
    // "locpickchange_dragend" and "locpickchange_click" events
    // by default. It combines map clicks, marker drag and
    // dragend events in an custom event called "locpickchange". 
    // Binding on those said solely triggers relies on a GMap
    // locpick widget patch which is included.
    //
    gmap.bind('locpickchange', function(context) {

    // Note: The coordinations stored in gmap.vars.latitude and
    // gmap.vars.longitude are for the previous location of the
    // locpicker marker, we need to use gmap.locpick_coord which
    // is pretty live!
    //
    if (gmap.locpick_coord) {

      // TODO: Implement the logic.
      // Current latitude: gmap.locpick_coord.lat()
      // Curren longitude: gmap.locpick_coord.lng()

    }
  });
}

如果您想使用locpickchange_click和locpickchange_dragend，这里是脏GMap模块的补丁:

From 2fb5a1ca71e1470e5413f10fb83ce959cd1d8634 Mon Sep 17 00:00:00 2001
From: Sepehr Lajevardi <me@sepehr.ws>
Date: Fri, 8 Jul 2011 14:38:27 +0430
Subject: [PATCH] Extends the locpick widget event system by adding
 lockpickchange_click and locpickchange_dragend custom
 events.

---
 js/locpick.js |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/js/locpick.js b/js/locpick.js
index d5aae9c..7c207f9 100644
--- a/js/locpick.js
+++ b/js/locpick.js
@@ -16,6 +16,18 @@ Drupal.gmap.addHandler('gmap', function (elem) {
     }
   });

+  // Bind triggering of a map click on our custom events.
+  obj.bind("locpickchange_dragend", function () {
+    if (obj.locpick_coord) {
+      GEvent.trigger(obj.map, "click", null, obj.locpick_coord);
+    }
+  });
+  obj.bind("locpickchange_click", function () {
+    if (obj.locpick_coord) {
+      GEvent.trigger(obj.map, "click", null, obj.locpick_coord);
+    }
+  });
+
   obj.bind("locpickremove", function () {
     obj.map.removeOverlay(obj.locpick_point);
     obj.locpick_coord = null;
@@ -40,10 +52,16 @@ Drupal.gmap.addHandler('gmap', function (elem) {
           GEvent.addListener(obj.locpick_point, 'dragend', function () {
             obj.locpick_coord = obj.locpick_point.getLatLng();
             obj.change('locpickchange', binding);
+            // Also trigger a locpickchange_dragend event
+            // so we can bind on just marker dragends.
+            obj.change('locpickchange_dragend', binding);
           });
           obj.locpick_coord = point;
           obj.map.panTo(point);
           obj.change('locpickchange', binding);
+          // Also trigger a locpickchange_click event
+          // so we can bind on just map clicks.
+          obj.change('locpickchange_click', binding);
         }
         else {
           // Unsetting the location
-- 
1.7.6