Home > Developer > Ajax

Instance code of ajax.net + jquery three-level linkage

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Copy codeThe Code is as follows: <! 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>
<Title> </title>
<Script src = "Jquery1.7.js" type = "text/javascript"> </script>
<Script type = "text/javascript">
$ (Function (){
$. Ajax ({
Type: "post ",
ContentType: "application/json ",
Url: "WebService1.asmx/loadprovince ",
Data :"{}",
Success: function (result ){
Var ping;
For (var I = 0; I <result. d. length; I ++ ){
Ping + = "<option value =" + result. d [I]. provinceID + "> ";
Ping + = result. d [I]. provincename;
Ping + = "</option> ";

}
$ ('# Select1'). append (ping );

}

})
$ ('# Select1'). change (function (){
// Remember to clear the contents of city and county during the second selection
$ ('# Select2 option: gt (0)'). remove ();
$ ('# Select3 option: gt (0)'). remove ();
// Bind the next list to the province change event (the province id is to be lost)

$. Ajax ({
Type: "post ",
ContentType: "application/json ",
Url: "WebService1.asmx/loadcity ",
Data: "{fatherid: '" + $ (' # Select1 option: selected'). val () + "'}",
Success: function (result ){
Var str2;
For (var I = 0; I <result. d. length; I ++ ){
Str2 + = "<option value =" + result. d [I]. cityID + "> ";
Str2 + = result. d [I]. cityname;
Str2 + = "</option> ";
}

$ ('# Select2'). append (str2 );
}
})
})
$ ('# Select2'). change (function (){
$ ('# Select3 option: gt (0)'). remove ();

$. Ajax ({
Type: "post ",
ContentType: "application/json ",
Url: "WebService1.asmx/loadarea ",
Data: "{fatherid: '" + $ (' # Select2 option: selected'). val () + "'}",
Success: function (result ){
Var str3;
For (var I = 0; I <result. d. length; I ++ ){
Str3 + = "<option value =" + result. d. areaID + "> ";
Str3 + = result. d [I]. areaname;
Str3 + = result. d [I]. father;

}
$ ('# Select3'). append (str3 );
}
})
})
})

</Script>
</Head>
<Body>
Save:
<Select id = "Select1">
<Option> -- select -- </option>
</Select>
City:
<Select id = "Select2">
<Option> -- select -- </option>
</Select>
County:
<Select id = "Select3">
<Option> -- select -- </option>
</Select>
</Body>
</Html>

Webservice:

Copy codeThe Code is as follows: [WebMethod] // load Province
Public List <Model. province> loadprovince () // Why do I need to use list? Because the previous value is shown here, it is impossible for one instance to be multiple model instances. One instance is a record to prevent field errors.
{
BLL. province bp = new BLL. province ();
List <Model. province> list = bp. getlistModel ();
Return list;
}
[WebMethod] // load the city
Public List <Model. city> loadcity (string fatherid)
{
BLL. city bc = new BLL. city ();
List <Model. city> list = bc. getlistmodel (fatherid );
Return list;
}
[WebMethod] // load County
Public List <Model. area> loadarea (string fatherid)
{
BLL. area ba = new BLL. area ();
List <Model. area> list = ba. getlistmodel (fatherid );
Return list;

}
}
}

DAL -- area

Copy codeThe Code is as follows: public System. Collections. Generic. List <Model. area> getlistmodel (string fatherid)
{
System. Collections. Generic. List <Model. area> list = new System. Collections. Generic. List <Model. area> ();
DataTable dt = GetList ("father =" + fatherid + ""). Tables [0];
Foreach (DataRow row in dt. Rows)
{
Model. area ma = new Model. area ();
Ma. areaID = row ["areaID"]. ToString ();
Ma. areaname = row ["areaname"]. ToString ();
Ma. father = row ["father"]. ToString ();
List. Add (ma );
}
Return list;
}

Dal -- city

Copy codeThe Code is as follows: public System. Collections. Generic. List <Model. area> getlistmodel (string fatherid)
{
System. Collections. Generic. List <Model. area> list = new System. Collections. Generic. List <Model. area> ();
DataTable dt = GetList ("father =" + fatherid + ""). Tables [0];
Foreach (DataRow row in dt. Rows)
{
Model. area ma = new Model. area ();
Ma. areaID = row ["areaID"]. ToString ();
Ma. areaname = row ["areaname"]. ToString ();
Ma. father = row ["father"]. ToString ();
List. Add (ma );
}
Return list;
}
}

DAL-provience

Copy codeThe Code is as follows: public System. Collections. Generic. List <Model. province> getlistModel ()
{
// The content to be queried is returned as an instance
// What we need to do here is to create a list and fill the list with the model instance, while the model needs to use a method to lose data and add it to the model.
// Create a list instance
System. Collections. Generic. List <Model. province> list = new System. Collections. Generic. List <Model. province> ();
// If you have lost data, you don't have to write it yourself. You can call the Getlist method to manipulate the database to get data.
DataTable dt = GetList (""). Tables [0];
// After obtaining the data, you need to add the data to the model instance.

Foreach (DataRow row in dt. Rows)
{
// Each row is an instance, so we need to put the model in the loop.
Model. province mp = new Model. province ();
Mp. provinceID = row ["provinceID"]. ToString ();
Mp. provincename = row ["provincename"]. ToString ();
List. Add (mp); // put all instances not added to the list
}
Return list;

}

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.

Related Keywords:
in instance of instance of class meaning instance of operator what meaning of instance instance of class instance of interface instance of object
Related Article
JQuery AJAX Timeout Timeout problem detailed _jquery
The difference between traditional web development patterns a...
JQuery ajax File Download _ajax
Ajax various implementation methods compare _ajax
Ajax Getting Started Guide (ii)
SPRINGMVC passing a parameter list object through Ajax or pas...

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More