Method 1,
Using response. Write, this method will write the JS Code at the top of the page (before <HTML> ):
System. Web. httpcontext. Current. response. Write ("<script language = JavaScript> alert ('js Code'); </SCRIPT> ");
Method 2,
Using registerstartupscript, this method embeds the JS Code at the bottom of the page and at the end of the form (</form>). This method is applicable to the JS Code to run after the page control is loaded:
System. Web. UI. Page page = (system. Web. UI. Page) system. Web. httpcontext. Current. Handler;
If (! Page. clientscript. isstartupscriptregistered (page. GetType (), "clientscript "))
Page. clientscript. registerstartupscript (page. GetType (), "clientscript", "<script language = JavaScript> alert ('js Code'); </SCRIPT> ");
Method 3,
Using registerclientscriptblock, this method embeds the JS Code at the top of the page and at the beginning of the form (<form>). This method is applicable to the js code to be executed before the control is loaded, similar to the response. write method:
System. Web. UI. Page page = (system. Web. UI. Page) system. Web. httpcontext. Current. Handler;
If (! Page. clientscript. isclientscriptblockregistered (page. GetType (), "clientscript "))
Page. clientscript. registerclientscriptblock (page. GetType (), "clientscript", "<script language = JavaScript> alert ('js Code'); </SCRIPT> ");
Column:
/// <Summary>
/// Control click the message confirmation prompt box
/// </Summary>
/// <Param name = "page"> current page environment, usually this </param>
/// <Param name = "MSG"> information to be displayed </param>
/// <Param name = "truedosomething"> if you click "OK", perform the following operations (Javascript script): </param>
/// <Param name = "falsedosomething"> if you click Cancel (Javascript script), </param>
Public static void showconfirm (system. Web. UI. Page, string MSG, string truedosomething, string falsedosomething)
{
Stringbuilder builder = new stringbuilder ();
Builder. append ("<script language = 'javascript 'defer> ");
Builder. append ("If (confirm ('" + MSG + "')){");
Builder. append ("" + truedosomething + "}");
Builder. append ("else {");
Builder. append ("" + falsedosomething + "}");
Builder. append ("</SCRIPT> ");
Page. clientscript. registerstartupscript (page. GetType (), "message", builder. tostring ());
}
1. dynamically create select
Function createselect (){
VaR myselect = Document. createelement (select );
Myselect. ID = myselect;
Document. Body. appendchild (myselect );
}
2. Add Option
Function addoption (){
Search for objects by ID,
VaR OBJ = Document. getelementbyid ('myselect ');
Add an option
OBJ. Add (New Option (text, value ));
}
3. Delete All option options
Function removeall (){
VaR OBJ = Document. getelementbyid ('myselect ');
OBJ. Options. Length = 0;
}
4. delete an option Option
Function removeone (){
VaR OBJ = Document. getelementbyid ('myselect ');
Index. The sequence number of the option to be deleted. The sequence number of the selected option is used here.
VaR Index = obj. selectedindex;
OBJ. Options. Remove (INDEX );
}
5. Obtain the option value.
VaR OBJ = Document. getelementbyid ('myselect ');
VaR Index = obj. selectedindex; No., which is the serial number of the currently selected option.
Var val = obj. Options [Index]. value;
6. Obtain the option text
VaR OBJ = Document. getelementbyid ('myselect ');
VaR Index = obj. selectedindex; No., which is the serial number of the currently selected option.
Var val = obj. Options [Index]. text;
7. Modify Option
VaR OBJ = Document. getelementbyid ('myselect ');
VaR Index = obj. selectedindex; No., which is the serial number of the currently selected option.
Var val = obj. Options [Index] = New Option (new text, new value );
8. Delete select
Function removeselect (){
VaR myselect = Document. getelementbyid (myselect );
Myselect. parentnode. removechild (myselect );
}
From http://www.cnblogs.com/rayking/archive/2008/09/03/1282473.html
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