我正在尝试在表单中动态添加 3 个(国家-州-城市)+ 2 个硬编码(类型-频带)多选过滤器。选定的值将查询 MySQL 数据库，记录集将被发送回 OpenStreetMap 上进行可视化。
所需示例:在“国家”中选择奥地利+瑞士，在“州”中填写蒂罗尔+提契诺州；选择两个州后，“城市”将填写因斯布鲁克+卢加诺。检查最后 2 个过滤器中的附加多个选项将完成查询数据库并返回要在 OSM 上显示的数据的值集。
当选择一个国家/地区/州/城市时，网络上有很多示例，并且我的代码可以正常工作。我找不到任何用于多项选择的内容，这就是我向您寻求帮助的原因。
问题是:如何修改我的代码以实现多项选择，如上面示例中所预期的那样？
我尝试了多种方法，但都没有成功。
我将 name =“country”转换为 name =“country[ ]”。这适用于单击“提交”后将值发布到 php 文件，但不适用于在 JavaScript/jQuery 中访问多个值。
类似地，我也尝试了对 var Country-state-city 进行硬编码、多合一序列化(查看代码中提到的变量)，相应地修改 PHP，但我无法从选定的复选框中提取值来推送将它们放入一个数组并准备多合一序列化。
下面提供了您需要的一切:
<!DOCTYPE html>
<html>
<head>
<title><b>HTML</b></title>
<script src = "http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script src = "sumo/jquery.sumoselect.min.js"></script>
<link href = "sumo/sumoselect.css" rel="stylesheet" />
<script type = "text/javascript">
function ajaxFunction(choice) {
var httpxml;
try {
// Firefox, Opera 8.0+, Safari
httpxml = new XMLHttpRequest();
} catch (e) {
// Internet Explorer
try {
httpxml = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
httpxml = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
alert("Your browser does not support Ajax! Update it or change browser");
return false;
}
}
}
function stateChanged() { //callback function
if (httpxml.readyState == 4) {
if (httpxml.status == 200) {
var myObject = JSON.parse(httpxml.responseText);
document.getElementById("Json").innerHTML = httpxml.responseText;
if (choice == 's1') {
//Discard old State/Region and City options, then populate them with new options and reload SumoSelect
for (j = document.myForm.state.options.length-1; j >= 0; j--) {
document.myForm.state.remove(j);
document.myForm.city.remove(j);
}
for (i = 0; i < myObject.state.length; i++) {
var newOption = $('<option>');
newOption.attr('value', myObject.state[i]).text(myObject.state[i]);
$('#state').append(newOption);
}
$(function(){
$('#state')[0].sumo.reload();
$('#city')[0].sumo.reload();
});
}
if (choice == 's2') {
//Discard old City options while keeping State/Region, then populate with new Cities and reload SumoSelect
for (j = document.myForm.city.options.length-1; j >= 0; j--) {
document.myForm.city.remove(j);
}
for (i = 0; i < myObject.city.length; i++) {
var newOption = $('<option>');
newOption.attr('value', myObject.city[i]).text(myObject.city[i]);
$('#city').append(newOption);
}
$(function(){
$('#city')[0].sumo.reload();
});
}
} else {
alert ("An error has occurred: " + httpxml.statusText);
}
}
} //end of stateChanged() callback function
//Ajax request
var url = "ajax-dd3ck.php";
var country = myForm.country.value;
//var country = "Italy-RepubblicaSanMarino-Austria";
if (choice != 's1'){
//var state = "Piemonte-Tirol";
var state = myForm.state.value;
var city = myForm.city.value;
} else {
var state = '';
var city = '';
}
url = url + "?country=" + country;
url = url + "&state=" + state;
url = url + "&city=" + city;
url = url + "&id=" + Math.random();
document.getElementById("url").innerHTML = url;
httpxml.open("GET", url, true);
httpxml.onreadystatechange = stateChanged; //callback function
httpxml.send(null);
}
</script>
</head>
<body>
<form name = "myForm" action = "ajax-dd3-details.php" method = "post">
<select id = "country" name = "country[]" style = "width: 160px" multiple = "multiple" onchange = "ajaxFunction('s1');" >
<?php
require "config.php";
$sql = " SELECT DISTINCT Nazione FROM $db.$table ";
foreach ($dbo->query($sql) as $row) {
echo "<option value = " . $row['Nazione'] . ">" . $row['Nazione'] . "</option>";
}
?>
</select>
<script>
$('#country').SumoSelect({
placeholder: 'Select Country',
selectAll: true
});
</script>
<select id = "state" name = "state[]" style = "width: 160px" multiple = "multiple" onchange = "ajaxFunction('s2');" >
</select>
<script>
$("#state").SumoSelect({
placeholder: 'Select State/Region',
selectAll: true
});
</script>
<select id = "city" name = "city[]" style = "width: 160px" multiple = "multiple" onchange = "ajaxFunction('s3');" >
</select>
<script>
$("#city").SumoSelect({
placeholder: 'Select City',
selectAll: true
});
</script>
<select name = "type[]" class = "testselect2" style = "width: 160px" multiple = "multiple" >
<option value="3D">3D</option>
<option value="C4FM">C4FM</option>
<option value="ATV">ATV</option>
<option value="DMR">DMR</option>
<option value="DS">DS</option>
<option value="EL">EL</option>
<option value="FDMA">FDMA</option>
<option value="LN">LN</option>
<option value="Beacon">Beacon</option>
<option value="Analogic">Analogic</option>
</select>
<script>
$('.testselect2').SumoSelect({
placeholder: 'Select Type',
selectAll: true
});
</script>
<select class = "testselect2" style = "width: 160px" name = "band[]" multiple = "multiple" >
<option value="29MHz">29 MHz</option>
<option value="50MHz">50 MHz</option>
<option value="VHF">VHF</option>
<option value="UHF">UHF</option>
<option value="SHF">SHF</option>
</select>
<script>
$('.testselect2').SumoSelect({
placeholder: 'Select Band',
selectAll: true
});
</script>
<input type = "submit" value = "Submit">
</form>
<br><br><br><br><br><br>
<br><br><br><br><br><br>
<br><br><br><br><br><br>
<div id = "url"></div>
<div id = "Json"></div>
</body>
</html>
ajax-dd3ck.php
<?Php
require "config.php";
error_reporting(0);// With this no error reporting will be there
$country = $_GET['country'];
$state1 = $_GET['state'];
$city1 = $_GET['city'];
// Validate the inputs - Checking country variable
if ((strlen($country)) > 0 and (!ctype_alpha($country))) {
echo "Data Error";
exit;
}
// Checking state variable (with space)
if ((strlen($state1)) > 0 and ctype_alpha(str_replace(' ', '', $state1)) === false) {
echo "Data Error";
exit;
}// end of input validation
if (strlen($country) > 0) {
$q_country = "SELECT DISTINCT(Regione) FROM $db.$table WHERE Nazione = '$country'";
}
$sth = $dbo->prepare($q_country);
$sth->execute();
$state = $sth->fetchAll(PDO::FETCH_COLUMN);
$q_state = "SELECT DISTINCT(Provincia) FROM $db.$table WHERE ";
if (strlen($state1) > 0) {
$q_state = $q_state . "Regione = '$state1'";
}
$sth = $dbo->prepare($q_state);
$sth->execute();
$city = $sth->fetchAll(PDO::FETCH_COLUMN);
$main = array('state'=>$state,'city'=>$city,'value'=>array("state1"=>"$state1","city1"=>"$city1"));
echo json_encode($main);
?>
MySQL:创建表
CREATE TABLE IF NOT EXISTS `markers` (
`ID` int(4) NOT NULL AUTO_INCREMENT,
`Ripetitore` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL,
`Frequenza` decimal(14,6) NOT NULL,
`Shift` decimal(14,6) NOT NULL,
`Tono` decimal(10,1) DEFAULT NULL,
`Banda` int(2) DEFAULT NULL,
`ID_Nazione` int(2) NOT NULL DEFAULT '1',
`Nazione` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL DEFAULT 'Italy',
`ID_Regione` int(2) NOT NULL,
`Regione` varchar(25) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL,
`ID_Provincia` int(3) NOT NULL,
`Provincia` varchar(22) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL,
`Localita` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL,
`ID_Tipologia` int(2) NOT NULL,
`Tipologia` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci DEFAULT NULL,
`Identificativo` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci DEFAULT NULL,
`Rete` varchar(34) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci DEFAULT NULL,
`Locator` varchar(6) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL,
`Lat` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL,
`Long` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci NOT NULL,
`Gestore` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_mysql500_ci DEFAULT NULL,
`Data` date NOT NULL DEFAULT '0000-00-00',
PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=1969 DEFAULT CHARSET=latin1;
MySQL:插入数据
INSERT INTO `markers` (`ID`, `Ripetitore`, `Frequenza`, `Shift`, `Tono`, `Banda`, `ID_Nazione`, `Nazione`, `ID_Regione`, `Regione`, `ID_Provincia`, `Provincia`, `Localita`, `ID_Tipologia`, `Tipologia`, `Identificativo`, `Rete`, `Locator`, `Lat`, `Long`, `Gestore`, `Data`) VALUES
(1, 'RV', '144.850000', '0.000000', '0.0', 15, 1, 'Italy', 0, 'ValleAosta', 102, 'Aosta', 'Aosta', 1, 'C4FM', 'IX1VKK', '', 'JN35PR', '45.73512', '7.30514', 'ix1vkk', '2016-11-29'),
(2, 'R0', '145.600000', '-0.600000', '74.4', 15, 1, 'Italy', 0, 'ValleAosta', 102, 'Aosta', 'Courmayeur (AO)', 16, 'Analogic', '', '', 'JN35LT', '45.8125', '6.958333', 'ari aosta ix1vkk', '2016-11-29'),
(3, 'R6', '145.750000', '-0.600000', '74.4', 15, 1, 'Switzerland', 0, 'Ticino', 102, 'Lugano', 'Lugano', 10, 'EL', '357734', '', 'JN35TS', '45.77513', '7.63412', 'ari aosta ix1vkk', '2016-11-29'),
(4, 'R7', '145.775000', '-0.600000', '0.0', 15, 1, 'Germany', 0, 'FreistaatBayern', 102, 'Munchen', 'Munchen', 4, 'DS', 'IX1VKK', '', 'JN35TS', '45.770833', '7.625', 'ari aosta', '2016-11-29'),
(5, 'RU12', '430.300000', '5.000000', '0.0', 20, 1, 'Slovenia', 0, 'ObalnoKraska', 102, 'Capodistria', 'Capodistria', 3, 'DMR', 'IX1VKK - 222111', 'BrandMeister', 'JN35PR', '45.72917', '7.29167', 'IX1VKK', '2017-01-21'),
(6, 'RU14', '431.950000', '0.000000', '0.0', 20, 1, 'Italy', 0, 'ValleAosta', 102, 'Aosta', 'Aosta (AO)', 1, 'C4FM', 'IX1VKK', '', 'JN35PR', '45.72917', '7.29167', 'IX1VKK - ARI Aosta', '2017-02-24'),
(7, 'RU15', '431.975000', '-1.600000', '74.4', 20, 1, 'Austria', 0, 'Tirol', 102, 'Innsbruck', 'Innsbruck', 16, 'Analogic', '', '', 'JN35PQ', '45.68280', '7.30574', 'IX1VKK - ARI Aosta', '2017-02-24'),
(8, '50 MHz', '50.480000', '0.500000', '123.0', 10, 1, 'RepubblicaSanMarino', 1, 'SanMarino', 60, 'CittaDiSanMarino', 'CittaDiSanMarino', 16, 'Analogic', '', 'Val Dora', 'JN35XM', '45.520833', '7.958333', 'iw1fwu', '2016-11-29'),
(9, 'E', '144.600000', '0.000000', '127.3', 15, 1, 'Italy', 1, 'Piemonte', 63, 'Torino', 'Torino', 10, 'EL', '983646', '', 'JN35TB', '45.0625', '7.625', 'ik1weg', '2016-11-29'),
(10, 'T', '144.625000', '0.000000', '82.5', 15, 1, 'Italy', 1, 'Piemonte', 63, 'Torino', 'Castagneto Po (TO)', 16, 'Analogic', '', 'Chivasso', 'JN35WD', '45.145833', '7.875', 'ari chivasso', '2016-11-29'),
(11, 'E', '144.700000', '0.000000', '114.8', 15, 1, 'Italy', 1, 'Piemonte', 63, 'Torino', 'Sestriere (TO)', 10, 'EL', '229829', 'Val Susa', 'JN34KW', '44.9375', '6.875', 'ik1ybm', '2016-11-29'),
(12, 'RV', '144.987500', '1.000000', '0.0', 15, 1, 'Italy', 1, 'Piemonte', 63, 'Torino', 'Torino (TO)', 4, 'DS', 'IR1CJ', ' ', 'JN35UB', '45.0625', '7.708333', 'IW1GAP', '2017-03-23'),
(13, 'E', '145.225000', '0.000000', '94.8', 15, 1, 'Italy', 1, 'Piemonte', 57, 'Verbania', 'Verbania', 10, 'EL', '573542', '', 'JN45GW', '45.9375', '8.541667', 'iz1uqg iz1ujj iz1xjr', '2016-11-29'),
(14, 'RV', '145.287500', '-0.600000', '82.5', 15, 1, 'Italy', 1, 'Piemonte', 62, 'Asti', 'Montaldo Scarampi (AT) ', 16, 'Analogic', '', '', 'JN44DT', '44.8125', '8.291667', 'iz1jvh', '2016-11-29'),
(15, 'E', '145.325000', '0.000000', '0.0', 15, 1, 'Italy', 1, 'Piemonte', 64, 'Cuneo', 'Cuneo', 10, 'EL', '391101', '', 'JN34SJ', '44.395833', '7.541667', 'sconosciuto', '2016-11-29');
有关 SumoSelect 的文档可以在 HERE 找到带有演示 HERE
我已经苦苦挣扎了好几天了，但我看不到这个问题，因为我太关注它了!任何帮助/答案/建议将不胜感激!
最佳答案
根据我对您问题的最佳理解，您想通过ajax调用将多选数据发送到服务器。
为此，您首先需要序列化数据。 例如。要向服务器发送多个状态，您可以执行类似的操作
state = $('#state').val()
state = JSON.stringify(state)
.....
// send state to server
url = url + "&state=" + state;
...
然后在 php 中你可以接收这些值，例如
$state = $_GET['state'];
$states_array = json_decode($state);
var_dump($states_array);
关于javascript - 访问 5 个过滤器中的多个选定值 - SumoSelect - Ajax - JavaScript - JQuery，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43529375/