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Dynamic Three-Level linkage menu, no refreshing, JSP implementation

Source: Internet
Author: User
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Level 3 in total. Select Department Division through the department and speciality through the department.

<% @ Page Language = "Java" Import = "Java. util. *, java. Lang. *, java. SQL. *" pageencoding = "gb18030" %>
<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<Script language = "JavaScript">
VaR deparmentcount; // three-level linkage menu code
Deparmentcount = 0;
VaR divisioncount;
Divisioncount = 0;
VaR specialitycount;
Specialitycount = 0
Department = new array ();
Division = new array ();
Speciality = new array ();
<%
System. Pub. oraclesql mydao = new system. Pub. oraclesql ();
Resultset rs = mydao.exe cquery ("select * from Division ");
Int I = 0;
For (Rs. Next ();! Rs. isafterlast (); RS. Next (), I ++) {%>
Division [<% = I %>] = new array ("<% = Rs. getstring ("division_name") %> "," <% = Rs. getstring ("department_id") %> "," <% = Rs. getstring ("ID") %> ");
<% }%>
Divisioncount = <% = I %>;

<%
System. Out. println ("Debug... 1 ");
Rs = mydao.exe cquery ("select * from speciality ");
I = 0;
For (Rs. Next ();! Rs. isafterlast (); RS. Next (), I ++) {%>
Speciality [<% = I %>] = new array ("<% = Rs. getstring ("speciality_name") %> "," <% = Rs. getstring ("division_id") %> "," <% = Rs. getstring ("ID") %> ");
<% }%>
Specialitycount = <% = I %>;

Function changedepartment (physical mentid ){
Document. form1.switch. value = "false ";
Document. form1.division. Length = 0;
VaR initialize mentid = initialize mentid;
VaR I;
For (I = 0; I <divisioncount; I ++ ){
If (Division [I] [1] = semantic mentid ){
Document. form1.division. Options [document. form1.division. Length] = New Option (Division [I] [0], Division [I] [2]);
}
}
Changedivision (document. form1.division. value );
}

Function changedivision (divisionid ){
Document. form1.switch. value = "false ";
Document. form1.speciality. Length = 0;
VaR divisionid = divisionid;
VaR I;
For (I = 0; I <specialitycount; I ++ ){
If (Speciality [I] [1] = divisionid ){
Document. form1.speciality. Options [document. form1.speciality. Length] = New Option (Speciality [I] [0], Speciality [I] [2]);
}
}
If (document. form1.speciality. length! = 0 ){
Document. form1.speciality. style. Visibility = 'visible ';
}
Else {
Document. form1.speciality. style. Visibility = 'den den ';
}
}

Function initialselect (){
Changedepartment (document. form1.department. Options [document. form1.department. selectedindex]. value );
}

</SCRIPT>
</Head>

<Body onload = "initialselect ();">
<Form name = "form1">
<Select name = "department" size = "1" id = "department" style = "width: 20%" onchange = "changedepartment (document. form1.department. options [document. form1.department. selectedindex]. value) ">
<%
Rs = mydao.exe cquery ("select * from Department ");
I = 0;
For (Rs. Next ();! Rs. isafterlast (); RS. Next (), I ++) {%>
<Option value = "<% = Rs. getstring (" ID ") %>"> <% = Rs. getstring ("department_name") %> </option>
<% }%>
</SELECT>
 
<Select name = "division" size = "1" id = "division" onchange = "changedivision (document. form1.division. Options [document. form1.division. selectedindex]. Value)">
</SELECT>

<Input type = "hidden" name = "Switch" value = "false">

<Select name = "speciality" size = "1">
</SELECT>
</Form>
</Body>
</Html>

After implementation, read the information in the three tables from the database. The generated HTML code is as follows:

<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<Script language = "JavaScript">
VaR deparmentcount; // three-level linkage menu code
Deparmentcount = 0;
VaR divisioncount;
Divisioncount = 0;
VaR specialitycount;
Specialitycount = 0
Department = new array ();
Division = new array ();
Speciality = new array ();

Division [0] = new array ("ccddd", "13", "100 ");

Division [1] = new array ("CCN", "14", "101 ");

Division [2] = new array ("cczz", "14", "102 ");

Division [3] = new array ("sdfgsdfg", "14", "103 ");

Division [4] = new array ("asdasdf", "14", "104 ");

Division [5] = new array ("zxcvzxcv", "14"," 106 ");

Division [6] = new array ("zxcvzv", "1", "107 ");

Division [7] = new array ("zxcvzxcv", "13", "108 ");

Division [8] = new array ("TV news", "2", "4 ");

Division [9] = new array ("TV photography", "2", "5 ");

Division [10] = new array ("Teaching and Research Section", "3", "6 ");

Division [11] = new array ("data center", "3", "7 ");

Division [12] = new array ("office", "3", "8 ");

Division [13] = new array ("zxcv", "14", "105 ");

Division [14] = new array ("Department of Communications Engineering", "1", "1 ");

Division [15] = new array ("Department of Electronic Information Engineering", "1", "2 ");

Division [16] = new array ("Department of Science and Art", "1", "3 ");

Division [17] = new array ("aaaa", "15", "109 ");

Divisioncount = 18;

Speciality [0] = new array ("ertwert", "101", "100 ");

Speciality [1] = new array ("vzxcvzxcv", "100", "101 ");

Speciality [2] = new array ("Zzz", "100", "102 ");

Speciality [3] = new array ("ASDF", "100", "103 ");

Speciality [4] = new array ("News Comment", "4", "1 ");

Speciality [5] = new array ("Network News", "4", "2 ");

Speciality [6] = new array ("Multimedia Technology", "1", "3 ");

Speciality [7] = new array ("art photography", "5", "4 ");

Speciality [8] = new array ("KKKK", "109", "104 ");

Specialitycount = 9;

Function changedepartment (physical mentid ){
Document. form1.switch. value = "false ";
Document. form1.division. Length = 0;
VaR initialize mentid = initialize mentid;
VaR I;
For (I = 0; I <divisioncount; I ++ ){
If (Division [I] [1] = semantic mentid ){
Document. form1.division. Options [document. form1.division. Length] = New Option (Division [I] [0], Division [I] [2]);
}
}
Changedivision (document. form1.division. value );
}

Function changedivision (divisionid ){
Document. form1.switch. value = "false ";
Document. form1.speciality. Length = 0;
VaR divisionid = divisionid;
VaR I;
For (I = 0; I <specialitycount; I ++ ){
If (Speciality [I] [1] = divisionid ){
Document. form1.speciality. Options [document. form1.speciality. Length] = New Option (Speciality [I] [0], Speciality [I] [2]);
}
}
If (document. form1.speciality. length! = 0 ){
Document. form1.speciality. style. Visibility = 'visible ';
}
Else {
Document. form1.speciality. style. Visibility = 'den den ';
}
}

Function initialselect (){
Changedepartment (document. form1.department. Options [document. form1.department. selectedindex]. value );
}

</SCRIPT>
</Head>

<Body onload = "initialselect ();">
<Form name = "form1">
<Select name = "department" size = "1" id = "department" style = "width: 20%" onchange = "changedepartment (document. form1.department. options [document. form1.department. selectedindex]. value) ">

<Option value = "2"> School of television and journalism </option>

<Option value = "3"> Computing Center </option>

<Option value = "1"> School of Engineering </option>

<Option value = "13"> fff </option>

<Option value = "14"> gdsf </option>

<Option value = "15"> zxcef </option>
 
</SELECT>
 
<Select name = "division" size = "1" id = "division" onchange = "changedivision (document. form1.division. Options [document. form1.division. selectedindex]. Value)">
</SELECT>

<Input type = "hidden" name = "Switch" value = "false">

<Select name = "speciality" size = "1">
</SELECT>
</Form>
</Body>
</Html>

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Related Keywords:
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