[Net] [Ajax] Ajax programming Memo -- ComboBox refreshing

Ajax programming memo-ComboBox refreshing

The programming logic is as follows: 1: The background obtains the corresponding lower-level department based on the ID of the higher-level department sent from the front-end, and the composition format is Department code 1-department name 1 | Department Code 2-department name 2 | department code 3-department name 3 ..... The front-end client splits the string and re-organizes the ComboBox of the lower-level department with JavaScript. 2: Use the request ['comboboxid'] method to retrieve the ComboBox value in the background, without the need for ComboBox. Value [Article 2nd applies to Asp.net] JavaScript code: // After the higher-level department is modified, the lower-level department must follow the change Function departmentchange () { VaR objdept = Document. All ['cmbdemotid']; VaR objsubdept = Document. All ['cmbsubdemotid']; If (objdept & objsubdept) { // Ajax call VaR response = register. refilldept (objdept. value ,'-'); If (response. value! = "") { VaR length = 1; While (length! = 0) { VaR length = objsubdept. Options. length; For (VAR I = 0; I <length; I ++) Objsubdept. Options. Remove (I ); Length = length/2; } VaR stritem = response. value. Split ('| '); If (stritem. length> 0) { For (VAR n = 0; n <stritem. length; n ++) { VaR option = Document. createelement ("option "); Option. value = stritem [N]; Option. Text = stritem [N]; // Alert (option. value ); Objsubdept. Options. Add (option ); } } } } }

 

Asp.net background server code:

/// <Summary>
/// Obtain the information of the subordinate department after the Department changes
/// </Summary>
/// <Param name = "strdept"> department code-department name </param>
/// <Param name = "strseparetor"> shard symbol </param>
/// <Returns> subordinate department. Format: department 1 | Department 2 | department 3 </returns>
[Ajax. ajaxmethod ()]
Public String refilldept (string strdept, string strseparetor)
{
String strdeptstring = "";

Try
{
String [] stritem = strdept. Split (strseparetor. tochararray ());

If (stritem. length> 1)
{
Olexamdepartment objolexamdepartment = new olexamdepartment ();

Dataset dstdept = objolexamdepartment. getdepartinfo (stritem [0]);

If (dstdept! = NULL)
{
If (dstdept. Tables [0]. Rows. Count> 0)
{
// Returns a string.
For (INT I = 0; I <dstdept. Tables [0]. Rows. Count; I ++)
{
Strdeptstring = strdeptstring + dstdept. tables [0]. rows [I] ["deptcode"]. tostring () + "-" + dstdept. tables [0]. rows [I] ["deptname"]. tostring () + "| ";
}
}
}

If (strdeptstring. length> 0)
{
Strdeptstring = stritem [0] + "-Headquarters |" + strdeptstring. substring (0, strdeptstring. Length-1 );
}
Else
{
Strdeptstring = stritem [0] + "-Headquarters ";
}
}

Return strdeptstring;
}
Catch (exception ex)
{
Return "";
}
}