我想做以下事情:
我有一个从服务器获取JSON数据的商店。 JSON看起来像这样:
{"id":"1","name":"Name1","address":"exampleaddress1","lat":"48.366268","lng":"10.892320","distance":"0"},{...}]
我的模特和商店:
Ext.regModel('Filiale', {
fields: ['id', 'name', 'address', 'distance', 'lat', 'lng'],
});
var ListStore = new Ext.data.Store({
model: 'Filiale',
id: 'ListStore',
autoLoad: false,
fields:['name', 'address', 'distance'],
proxy: {
type: 'ajax',
url : 'http://example.com/getSomeJson.php',
reader: {
type: 'json'
}
},
listeners: {
load: function(){
ListStore.each(function(store){
var newData = getDistance(store.data); // this function calculates the distance from currentLocation to the received address
console.log(newData); // i see a object in the console, with the correct calculated distance
console.log(newData.distance); // this shows the old distance which is set to '0' in the databse
//at this point i want to update the received records with the new distance, but the list always shows the old distance
});
}
}
});
我不明白,为什么两个console.logs显示不同的距离值。任何人都可以向我解释一下吗?
我的清单:
var listPanel = new Ext.List({
title: 'ListStore',
store: ListStore,
id: 'addresslist',
itemTpl: '<div class="contact">{name}, {address}, {distance}</div>',
rendered: false,
listeners: {
beforerender: function(){
ListStore.load();
}
}
});
我计算距离的函数:
var getDistance = function(dataset){
navigator.geolocation.getCurrentPosition(function(position){
var start = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
//add current position marker to map
var marker = new google.maps.Marker({
map: mapPanel.map,
position: start
});
var end = new google.maps.LatLng(dataset.lat, dataset.lng);
var service = new google.maps.DirectionsService();
var request = {
origin: start,
destination: end,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
service.route(request, function(result, status){
if (status == google.maps.DirectionsStatus.OK) {
dataset.distance = result.routes[0].legs[0].distance.value / 1000;
}
});
});
return dataset;
};
正如我所说,正确计算距离并返回对象...但我无法更新商店或列表中的记录......
答案 0 :(得分:3)
我不明白,为什么两个console.logs显示不同的距离值。任何人都可以向我解释一下吗?
您使用的是Chrome吗? Chrome控制台有时会出现最新的控制台数据问题
正如我所说,正确计算距离并返回对象...但我无法更新商店或列表中的记录......
您脚本中的商店记录始终是最新的 - 在JS中通过引用传递obejcts,因此您甚至不必返回newData - store对象将自动更新
在向商店类型添加一些值之后:
listpanel.refresh()
将当前商店加载到列表