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Use php and ajax to write a three-level linkage between provinces, cities, and cities to implement regional drop-down selection,

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Author: User
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Use php and ajax to write a three-level linkage between provinces, cities, and cities to implement regional drop-down selection,
To achieve three levels of interaction on this page, we need to create three php files. The first php file is imported into the jQuery file, which is embedded with JavaScript. The second php file is a php processing page, introduce the encapsulated database files. The third PHP file is the encapsulated database files. the first php JavaScript file

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Script src = "jquery-1.11.2.min.js"> </script>
<Title> untitled document </title>
</Head>
<Br/>
<H1> all provinces, municipalities, and districts in China <Div id = "sj"> </div>

<Body>
<Script type = "text/javascript">

$ (Document). ready (function (e ){


// Create a drop-down menu in the div
$ ("# Sj" 2.16.html ("<select id = 'shanghai'> </select> <select id = 'shi'> </select> <select id = 'qu'> </select> ");


// Fill data with the Fill keyword
FillSheng (); // fill in provincial data
FillShi (); // fill the City Data
FillQu (); // fill area data

// Fill province Method
Function FillSheng (){

Var code = "0001"; // the province's parent code

$. Ajax ({

Url: "sheng_2_chuli.php ",
Data: {code: code },
Type: "POST ",
DataType: "TEXT ",
Async: false,
Success: function (data ){
Var hang = data. split ("| ");

Var str = "";

For (var I = 0; I

Var lie = hang [I]. split ("^ ");

Str + = "<option value = '" + lie [0] + "'>" + lie [1] + "</option> ";

}
// Put all <option> in the province drop-down list
$ ("# Sheng" 2.16.html (str );


}


});


}


// Fill the city
Function FillShi (){

Var code = $ ("# sheng"). val (); // the city's parent code

$. Ajax ({

Url: "sheng_2_chuli.php ",
Data: {code: code },
Type: "POST ",
DataType: "TEXT ",
Async: false,
Success: function (data ){

Var hang = data. split ("| ");

Var str = "";

For (var I = 0; I

Var lie = hang [I]. split ("^ ");

Str + = "<option value = '" + lie [0] + "'>" + lie [1] + "</option> ";

}
// Put all <option> in the drop-down list of the city
$ ("# Shi" pai.html (str );

}


});

 

}


// Method of filling Area
Function FillQu (){

Var code = $ ("# shi"). val (); // The parent code of the partition

$. Ajax ({
Url: "sheng_2_chuli.php ",
Data: {code: code },
Type: "POST ",
DataType: "TEXT ",
Async: false,
Success: function (data ){
Var hang = data. split ("| ");
Var str = "";

For (var I = 0; I Var lie = hang [I]. split ("^ ");

Str + = "<option value = '" + lie [0] + "'>" + lie [1] + "</option> ";


}
// Put all <option> in the drop-down list of the Zone
$ ("# Qu" pai.html (str );
}

 


});

}


// When you click to select the province, the city and district change together.
$ ("# Sheng"). change (function (){
FillShi ();
FillQu ();

});

// When you click to select the city, the zone changes together.
$ ("# Shi"). change (function (){
FillQu ();


});

 

});

 

 


</Script>


</Body>
</Html>

 

 

 

2. The second php processing file

<? Php
Include ("DBDA. class. php ");

$ Db = new DBDA ();

$ Pcode = $ _ POST ["code"];

$ SQL = "select AreaCode, AreaName from chinastates where ParentAreaCode = '{$ pcode }'";

Echo $ db-> StrQuery ($ SQL );
?>

 

 

 

3. The third php package database files

 

<? Php
Class DBDA
{
Public $ host = "localhost ";
Public $ uid = "root ";
Public $ pwd = "root ";
Public $ dbname = "mydb ";

 


Public function Query ($ SQL, $ type = 1)
{
$ Db = new mysqli ($ this-> host, $ this-> uid, $ this-> pwd, $ this-> dbname );
$ Result = $ db-> Query ($ SQL );
If ($ type = "1 ")
{
Return $ result-> fetch_all ();

 

} Else
{
Return $ result;
}
}

 


Public function StrQuery ($ SQL, $ type = 1)
{
$ Db = new mysqli ($ this-> host, $ this-> uid, $ this-> pwd, $ this-> dbname );
$ Result = $ db-> Query ($ SQL );
If ($ type = "1 ")
{
$ Arr = $ result-> fetch_all ();
$ Str = "";
Foreach ($ arr as $ v)
{
$ Str = $ str. implode ("^", $ v). "| ";
}
Return substr ($ str, 0, strlen ($ str)-1 );
} Else
{
Return $ result;
}
}
}

 

 

Effect:

 

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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