The basic idea is: dynamically create the option of the select control in JS, and obtain the province and city information obtained from the SQL database in PHP through Ajax. The code is a bit long, but many of them are similar. , for example, the methods for obtaining provinces, cities, and districts in JS are similar, and in PHP, different select statements are executed through different parameters.
index.html code:
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
PHP+Ajax to get SQL database</ title><br> <META http-equiv=Content-Type content="text/html; charset=gb2312"><br> <script src="scripts/thumbnails.js" type="text/javascript" ></script><br></head></p>
<p><body></p>
<p> <div id="description"><br> <select><strong>thumbnails.js code: </strong></span>
window.onload = getProvince;
function createRequest() {//Ajax requires objects for PHP interaction
try {
Request = new XMLHttpRequest();//Create a new request object;
} catch (tryMS) {
Try {
Request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (otherMS) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
request = null;
}
}
}
return request;
}
function sech(id) {//Triggered when province and city change, select onchange event
var aa = document.getElementById(id);
if(id=="sheng"){
GetCity(aa.value);//Here aa.value is the id of the province
}
if(id=="shi")
{
getCounty(aa.value);//here aa.value is the id of the city
}
}
function getProvince() {//Get all provinces
request = createRequest();
if (request == null) {
alert("Unable to create request");
Return;
}
var url= "getDetails.php?ID=0";//When ID=0 is passed to PHP, let it get all provinces
request.open("GET", url, true);
request.onreadystatechange = displayProvince; //Set the callback function
request.send(null); //Send request
}
function getCity(id){//Get the city corresponding to the province
request = createRequest();
if (request == null) {
alert("Unable to create request");
Return;
}
var url= "getDetails.php?ID=" + escape(id);
request.open("GET", url, true);
request.onreadystatechange = displayCity;
request.send(null);
}
function getCounty(id){//Get the district corresponding to the city
request = createRequest();
if (request == null) {
alert("Unable to create request");
Return;
}
var url= "getDetails.php?ID=" + escape(id);
request.open("GET", url, true);
request.onreadystatechange = displayCounty;
request.send(null);
}
function displayProvince() {//Dynamicly add the acquired data to select
if (request.readyState == 4) {
If (request.status == 200) {
var a=new Array;
var b=request.responseText;//Assign the data returned by PHP to b
a=b.split(",");//Save this data in array a through ","
document.getElementById("sheng").length=1;
var obj=document.getElementById("sheng');
for(i=0;i
Obj.options.add(new Option(a[i],i+1)); //Dynamicly generate OPTION and add it to select. The first parameter is Text and the second parameter is Value.
}
}
}
function displayCity() {//Dynamicly add the acquired data to select
if (request.readyState == 4) {
If (request.status == 200) {
var a=new Array;
var b=request.responseText;
a=b.split(",");
document.getElementById("shi").length=1;//Reselect
document.getElementById("xian").length=1; //Reselect
if(document.getElementById("sheng").value!="province"){
var obj=document.getElementById('shi');
for(i=0;i
obj.options.add(new Option(a[i], document.getElementById("sheng").value*100+i+1)); //ocument.getElementById("sheng").value*100+i+ 1 corresponds to the city ID.
}
}
}
}
function displayCounty() {//Add the obtained data to select
if (request.readyState == 4) {
If (request.status == 200) {
var a=new Array;
var b=request.responseText;
a=b.split(",");
document.getElementById("xian").length=1;
if(document.getElementById("sheng").value!="province"&&document.getElementById("shi").value!="city"){
var obj=document.getElementById('xian');
for(i=0;i
Obj.options.add(new Option(a[i],i+1001));
}
}
}
}
<span><strong>getDetails.php code: </strong></span>
<p><?php<br /> header("Content-Type: text/html; charset=gb2312");<br /> $conn = new COM("ADODB.Connection") or die("Cannot start ADO" );<br />$connstr = "Provider=SQLOLEDB;Persist Security Info=False;User ID=sa;Password=zzh;Initial Catalog=NoteBook;Data Source=localhost"; <br /> <br />if($_REQUEST['ID']= =0){//Get the list of provinces<br />$conn->Open($connstr); //Establish a database connection<br> $sqlstr = "select name from Province"; //Set the query string<br> $rs = $conn->Execute($sqlstr); //Execute the query to obtain the results<br> $num_cols = $rs->Fields->Count(); //Get the number of columns in the data set<br> $ Province=array();<br> $i=0;<br> while (!$rs->EOF) {<br> $Province[$i]=$rs->Fields['name']- >Value.","; <br> $rs->MoveNext(); <br> $i++; <br> }<br> foreach($Province as $val)<br> echo $val;<br> $conn->Close();<br> $rs = null;<br> $conn = null; <br> }<br> <br> <br> <br>if($_REQUEST['ID' ]>0&&$_REQUEST['ID']<35){//Get the list of cities corresponding to the province<br />$conn->Open($connstr); //Establish a database connection<br> $sqlstr = " select name from City where cid=".$_REQUEST['ID']; //Set query string<br> $rs = $conn->Execute($sqlstr); //Execute query to get results<br> $ num_cols = $rs->Fields->Count(); //Get the number of columns in the data set<br> $City=array();<br> $i=0;<br> while (!$rs-> ;EOF) {<br> $City[$i]=$rs->Fields['name']->Value.","; <br> $rs->MoveNext(); <br> $ i++; <br> }<br> foreach($City as $val)<br> echo $val;<br> $conn->Close();<br> $rs = null;<br> $conn = null; <br> }<br> <br> <br> <br>if($_REQUEST['ID']>100){//Get the county list corresponding to the province and city<br>$conn->Open ($connstr); //Establish a database connection<br> $sqlstr = "select name from County where cid=".$_REQUEST['ID']; //Set the query string<br> $rs = $conn-> ;Execute($sqlstr); //Execute the query to get the results<br> $num_cols = $rs->Fields->Count(); //Get the number of columns in the data set<br> $County=array();<br> $i=0;<br> while (!$rs->EOF) {<br> $County[$i]=$rs->Fields['name']->Value."," ; <br> $rs->MoveNext(); <br> $i++; <br> }<br> foreach($County as $val)<br> echo $val;<br> $conn->Close ();<br> $rs = null;<br> $conn = null; <br> }<br>?></p>
<span><strong>Database design, tables Province table, City table, County table. </strong></span>
Requirements: The Province table requires id and name. The id is recommended to be from 1 to 34. For example, the id of Beijing is 1, the id of Guangdong is 2, and so on;
The City table requires id, name and cid. The id is cid*100+1, and the cid is the superior of the city. For example, the superior of Shenzhen is Guangdong Province, and if the cid is 2, the id of Shenzhen is 201, and so on.
The County table requires id, name and cid. Because it is a three-level relationship, the id can be arbitrary. It is recommended to increase it from 10001. The cid is the superior level. For example, the cid of Baoan District is 201, and the cid of Longgang District is also 201;
<span><strong>Screenshot: </strong></span>
HTML effect:
<img src="http://www.bkjia.com/uploads/allimg/140525/12395211G-0.jpg" alt="">
The result after completion:
<img src="http://www.bkjia.com/uploads/allimg/140525/12395241B-1.jpg" alt=""><img src="http://www.bkjia.com/uploads/allimg/140525/123952MF-2.jpg" alt=""><img src="http://www.bkjia.com/uploads/allimg/140525/123952AH-3.jpg" alt="">
Note: PHP is server-side. It is recommended to debug through IP after publishing the website.
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