Javascript 从小到大构建有序列表
我有以下硬编码的JSON:Javascript 从小到大构建有序列表,javascript,jquery,cordova,Javascript,Jquery,Cordova,我有以下硬编码的JSON: var myData = [ {"Identifier":1,"Naam":"Van Der Valk","Adres":"Europaweg 218","Postcode":"1238AC","Plaats":"Zoetermeer","Longitude":"4.48822","Latitude":"52.06258", "Status":"Laadpunten Beschikbaar", "lunch":"true", "d
var myData = [
{"Identifier":1,"Naam":"Van Der Valk","Adres":"Europaweg 218","Postcode":"1238AC","Plaats":"Zoetermeer","Longitude":"4.48822","Latitude":"52.06258", "Status":"Laadpunten Beschikbaar", "lunch":"true", "diner":"true", "meet":"true", "wifi":"true"},
{"Identifier":2,"Naam":"NOT Given","Adres":"NOT Given 1","Postcode":"0000LL","Plaats":"Rotterdam","Longitude":"0.00000","Latitude":"0.00000", "lunch":"false"},
{"Identifier":3,"Naam":"NOT Given","Adres":"NOT Given 6","Postcode":"0000LL","Plaats":"Rotterdam","Longitude":"0.00000","Latitude":"0.00000", "lunch":"false"},
{"Identifier":4,"Naam":"NOT Given","Adres":"NOT Given 1","Postcode":"0000LL","Plaats":"Den Haag","Longitude":"0.00000","Latitude":"0.00000", "lunch":"false"},
{"Identifier":5,"Naam":"plek b met lunch en diner","Adres":"NOT Given 218","Postcode":"0000LL","Plaats":"Zoetermeer","Longitude":"0.00000","Latitude":"0.00000", "lunch":"true", "diner":"true", "wifi":"true"}
];
我在ios phonegap应用程序中使用的json。。Json中的每一行代码都是荷兰的一个点。。我正在尝试构建一个函数,用于计算手机所在位置与json的lat和long之间的距离。。最终,这些json代码需要在一个有序的列表中出现,其中的距离也是从小到大
对于距离测量,我使用了以下方法:
function haversine() {
$.each(myData, function(index, element) {
var R = 6371; // earth's mean radius in km
var dLat = rad(element.Latitude - lat1);
var dLong = rad(element.Longitude - long1);
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(rad(lat1)) * Math.cos(rad(element.Latitude)) * Math.sin(dLong/2) * Math.sin(dLong/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;
//var element = document.getElementById('afstand');
//element.innerHTML = 'afstand: ' + d.toFixed(3);
$('.greenfluxlist').append('<li id="' + element.Identifier + '"><a href="Details.html?id=' + element.Identifier + '" rel="external">' + element.Naam + ' ' + element.Plaats + '<p> <br/>' + element.Adres + ',<br/> ' + element.Postcode + ' ' + element.Plaats + '<br/> Status: ' + element.Status + '</p> <span class="ui-li-count">' + d.toFixed(3) + '</span></a></li>');
});
$('.greenfluxlist').trigger('create');
$('.greenfluxlist').listview('refresh');
//return d.toFixed(3);
}
函数haversine(){
$.each(myData、函数(索引、元素){
var R=6371;//地球的平均半径,单位为km
var dLat=拉德(元素纬度-纬度1);
var dLong=rad(element.Longitude-long1);
变量a=Math.sin(dLat/2)*Math.sin(dLat/2)+
Math.cos(rad(lat1))*Math.cos(rad(element.lation))*Math.sin(dLong/2)*Math.sin(dLong/2);
var c=2*Math.atan2(Math.sqrt(a),Math.sqrt(1-a));
var d=R*c;
//var元素=document.getElementById('afstand');
//element.innerHTML='afstand:'+d.toFixed(3);
$('.greenfluxlist').append(');
});
$('.greenfluxlist')。触发器('create');
$('.greenfluxlist').listview('refresh');
//返回d.toFixed(3);
}
我现在的问题是,如何构建有序列表,是否可以将所有内容都放入一个数组中,然后循环遍历它或其他内容,我认为必须有一个简单的解决方案,但我不知道。要对数组进行排序,请使用排序方法
您应该首先计算距离,然后对数组排序,然后生成列表。大概是这样的:
function calculateDistance(element)
{
var R = 6371; // earth's mean radius in km
var dLat = rad(element.Latitude - lat1);
var dLong = rad(element.Longitude - long1);
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(rad(lat1)) * Math.cos(rad(element.Latitude)) * Math.sin(dLong/2) * Math.sin(dLong/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
return R * c;
}
function generateList(data)
{
for(var i=0; i<data.lenght; i++)
{
var element = data[i];
//var element = document.getElementById('afstand');
//element.innerHTML = 'afstand: ' + element.Distance.toFixed(3);
$('.greenfluxlist').append('<li id="' + element.Identifier + '"><a href="Details.html?id=' + element.Identifier + '" rel="external">' + element.Naam + ' ' + element.Plaats + '<p> <br/>' + element.Adres + ',<br/> ' + element.Postcode + ' ' + element.Plaats + '<br/> Status: ' + element.Status + '</p> <span class="ui-li-count">' + element.Distance.toFixed(3) + '</span></a></li>');
}
}
for(var i=0; i<myData.length; i++)
{
myData[i].Distance = calculateDistance(myData[i]);
}
myData.sort(function(a,b) {
return a.Distance > b.Distance;
});
generateList(myData);
函数计算状态(元素)
{
var R=6371;//地球的平均半径,单位为km
var dLat=拉德(元素纬度-纬度1);
var dLong=rad(element.Longitude-long1);
变量a=Math.sin(dLat/2)*Math.sin(dLat/2)+
Math.cos(rad(lat1))*Math.cos(rad(element.lation))*Math.sin(dLong/2)*Math.sin(dLong/2);
var c=2*Math.atan2(Math.sqrt(a),Math.sqrt(1-a));
返回R*c;
}
函数生成列表(数据)
{
对于(变量i=0;i带有“有序列表”你是说html OL?你需要它按特定的顺序吗?是的,例如,如果第一个标识符为1的json代码有20公里,第二个标识符为10公里,那么第二个标识符的信息需要放在列表的顶部。我想这不是我需要的。为什么不?也许我不理解这个问题,但我认为这是你需要的。你需要吗您需要对代码的作用进行澄清吗?