Table of Contents
回复讨论(解决方案)
Home Backend Development PHP Tutorial 用Ajax写的省市联动,修改时如何显示地址里已有的省和市

用Ajax写的省市联动,修改时如何显示地址里已有的省和市

Jun 23, 2016 pm 01:44 PM

用Ajax写的省市联动,添加地址的时候默认的省市都显示,- -请选择- - 但是修改的时候如何让省市下拉菜单里默认的选中,地址里的省市?[下拉菜单里的省,是直接从数据库拿出来保存在一个数组变量里,把变量付给下拉框]


js代码:
<script> <br /> //创建Ajax引擎对象 <br /> function getXmlHttpObject(){ <br /> var xmlHttpRequest; <br /> if(window.ActiveXObject){ <br /> xmlHttpRequest=new ActiveXObject("Microsoft.XMLHTTP"); <br /> }else{ <br /> xmlHttpRequest=new XMLHttpRequest(); <br /> } <br /> return xmlHttpRequest; <br /> } <br /> <br /> var myXmlHttpRequest=""; <br /> <br /> <br /> <br /> function getCities(){ <br /> <br /> myXmlHttpRequest=getXmlHttpObject(); <br /> <br /> if(myXmlHttpRequest){ <br /> <br /> var url="../plus/showcity.php";//post <br /> <br /> var data="province="+$("sheng").value; <br /> <br /> myXmlHttpRequest.open("post",url,true); <br /> <br /> myXmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); <br /> <br /> myXmlHttpRequest.onreadystatechange=chuli; <br /> <br /> myXmlHttpRequest.send(data); <br /> <br /> <br /> } <br /> } <br /> <br /> function chuli(){ <br /> <br /> if(myXmlHttpRequest.readyState==4){ <br /> <br /> if(myXmlHttpRequest.status==200){ <br /> //取出服务器回送的数据 <br /> //window.alert(myXmlHttpRequest.responseXML); <br /> var cities=myXmlHttpRequest.responseXML.getElementsByTagName("city"); <br /> //alert(cities.length); <br /> //遍历并取出城市 <br /> $("city").length=0; <br /> var myOption=document.createElement("option"); <br /> myOption.innerHTML="--请选择--"; <br /> $("city").appendChild(myOption); <br /> <br /> for(var i=0;i<cities.length;i++){ <br /> var city_name=cities[i].childNodes[0].nodeValue; <br /> //alert(city_name); <br /> var myOption=document.createElement("option"); <br /> myOption.value=city_name; <br /> myOption.innerHTML=city_name; <br /> $("city").appendChild(myOption); <br /> } <br /> } <br /> } <br /> } <br /> <br /> function $(id){ <br /> <br /> return document.getElementById(id); <br /> } <br /> </script>

html代码:

 


            

            
            

            

            
            

            

            
   
   
            

            

            
            

            

            
            

            

             是   否
            

        
            


        


php文件:

require_once (dirname(__FILE__) . "/../include/common.inc.php");
require_once(DEDEINC.'/dedesql.class.php');
//服务器端
//告诉浏览器返回的数据格式是xml格式
header("Content-Type: text/xml;charset=utf-8");
//告诉浏览器不要缓存数据
header("Cache-Control: no-cache");

//接收用户选择省的名字
$province=$_POST['province'];

$city = array();
$dsql->SetQuery("SELECT * FROM area WHERE reid=$province");
$dsql->Execute();
$i = 0 ;
while($row=$dsql->GetArray())
{
    $city[] = $row;
    $i++;
}
unset($row);
$info="";
$len=count($city);
for($l=0;$l    //file_put_contents("e:/aa.txt",$city[$l][name],FILE_APPEND);
    $info.="".$city[$l][name]."";  
}
$info.="
";
file_put_contents("e:/aa.txt",$info,FILE_APPEND);
echo $info;


回复讨论(解决方案)

选中 省 ajax 取得 市 列表
并不需要再修改 省 列表了

怎么选中省呢??

那我就奇怪了,你不是 省市联动 吗?
选中省 当然是用户的事情啦

Ajax实现数据库填充省市下拉框联动菜单示例
//Ajax和DropDownList设置
 
    

  
                        
                                                             onselectedindexchanged="dlSheng_SelectedIndexChanged">
                            
                                                
                            

                        

                    

//调用数据库显示下拉框数据
SqlConnection sqlcon;
    string strCon = ConfigurationManager.AppSettings["conn"];
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            sqlcon = new SqlConnection(strCon);
            string sqlstr = "select tbSheng from tb_Sheng";
            SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
            DataSet myds = new DataSet();
            sqlcon.Open();
            myda.Fill(myds);
            dltbSheng.DataSource= myds;
            dltbSheng.DataValueField = "tbSheng";
            dltbSheng.DataBind();
            string strtb_Shi = "select * from dl_Shi where tbSheng='" + dltbSheng.SelectedItem.Text + "'";
            SqlDataAdapter mydaShi = new SqlDataAdapter(strtb_Shi, sqlcon);
            DataSet mydsShi = new DataSet();
            mydaShi.Fill(mydsShi);
            ddlShi.DataSource = mydsShi;
            ddlShi.DataValueField = "tb_Shi";
            ddlShi.DataBind();
            sqlcon.Close();
        }

    }
    protected void dlSheng_SelectedIndexChanged(object sender, EventArgs e)
    {
        sqlcon = new SqlConnection(strCon);
        string sqlstr = "select * from dl_Shi where tbSheng='" + dltbSheng.SelectedItem.Text+ "'";
        SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
        DataSet myds = new DataSet();
        sqlcon.Open();
        myda.Fill(myds);
        ddlShi.DataSource = myds;
        ddlShi.DataValueField = "tb_Shi";
        ddlShi.DataBind();
        sqlcon.Close();
    }

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

How does session hijacking work and how can you mitigate it in PHP? How does session hijacking work and how can you mitigate it in PHP? Apr 06, 2025 am 12:02 AM

Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.

Describe the SOLID principles and how they apply to PHP development. Describe the SOLID principles and how they apply to PHP development. Apr 03, 2025 am 12:04 AM

The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.

What are Enumerations (Enums) in PHP 8.1? What are Enumerations (Enums) in PHP 8.1? Apr 03, 2025 am 12:05 AM

The enumeration function in PHP8.1 enhances the clarity and type safety of the code by defining named constants. 1) Enumerations can be integers, strings or objects, improving code readability and type safety. 2) Enumeration is based on class and supports object-oriented features such as traversal and reflection. 3) Enumeration can be used for comparison and assignment to ensure type safety. 4) Enumeration supports adding methods to implement complex logic. 5) Strict type checking and error handling can avoid common errors. 6) Enumeration reduces magic value and improves maintainability, but pay attention to performance optimization.

How to debug CLI mode in PHPStorm? How to debug CLI mode in PHPStorm? Apr 01, 2025 pm 02:57 PM

How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...

How to automatically set permissions of unixsocket after system restart? How to automatically set permissions of unixsocket after system restart? Mar 31, 2025 pm 11:54 PM

How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

See all articles