Choose between two ListBox options

1. Double-click the ListBox option on the left to add it to the ListBox on the right. After testing, it has been successfully added.

Protected void page_load (Object sender, eventargs e) <br/>{< br/> If (! Ispostback) <br/>{</P> <p> If (! Page. isstartupscriptregistered ("lstcarleft") {listbox_dblclick ("lstcarleft", page, lstcarleft, "lstcarleft", "lstcarright") ;}< br/> If (! Page. isstartupscriptregistered ("lstcarright") {listbox_dblclick ("lstcarright", page, lstcarright, "lstcarright", "lstcarleft ");} <br/>}</P> <p> Public void listbox_dblclick (string key, page, system. web. UI. webcontrols. webcontrol, string removelistbox, string addlistbox) <br/>{< br/> removelistbox = "document. getelementbyid ('"+ removelistbox +"') "; addlistbox =" en T. getelementbyid ('"+ addlistbox +"') "; <br/> string mflistboxjs =" <MCE: script language = JavaScript> <! -- <Br/> Function Change (removelistbox, addlistbox) "; <br/> mflistboxjs ++ =" {"; <br/> mflistboxjs + =" Var addoption = document. createelement ('option');/N "; <br/> mflistboxjs + =" Var index1;/N "; mflistboxjs + =" If (removelistbox. length = 0) Return (false);/N "; <br/> mflistboxjs + =" index1 = removelistbox. selectedindex;/N "; mflistboxjs + =" If (index1 <0) Return (false);/N "; <br/> mflistboxjs + =" addoption. TEXT = removelistbox. options (index1 ). text;/N "; <br/> mflistboxjs + =" addoption. value = removelistbox. value;/N "; <br/> mflistboxjs + =" addlistbox. add (addoption);/N "; <br/> mflistboxjs ++ =" removelistbox. remove (index1)/n "; <br/> mflistboxjs ++ ="} "; <br/> mflistboxjs ++ =" <br/> // --> </MCE: SCRIPT> "; <br/> page. registerstartupscript (Key, mflistboxjs); <br/> webcontrol. attributes. add ("ondblclick", "Change (" + removelistbox + "," + addlistbox + ");"); <br/>}< br/>

 

 

2. Put two left and right arrows in the two listboxes. Click add or delete. The following method is better, and you can count the data in the ListBox when the left and right are moved.

The following statistics increase the amount in ListBox ..

Protected void imgbtnadd_click (Object sender, imageclickeventargs e) <br/>{< br/> decimal sum = convert. todecimal (viewstate ["sum"]); </P> <p> If (lstcarleft. selecteditem = NULL) <br/>{< br/> scriptmanager. registerstartupscript (this, GetType (), "84", "alert ('select the license plate number on the Left ');", true); </P> <p> return; <br/>}< br/> for (INT I = 0; I <lstcarleft. items. count; I ++) <br/>{< br/> If (lstcarleft. items [I]. selected) <br/>{< br/> listitem li = new listitem (); <br/> Li. TEXT = lstcarleft. selecteditem. text; <br/> Li. value = lstcarleft. selectedvalue; <br/> string [] strvalue = spit (Li. value, "*"); <br/> sum + = int. parse (strvalue [1]); </P> <p> lstcarright. items. add (LI); </P> <p> lstcarleft. items. remove (lstcarleft. selecteditem); <br/>}</P> <p> viewstate ["sum"] = sum; <br/>}< br/> txt_jsje.text = viewstate ["sum"]. tostring (); <br/> txt_ysje.text = viewstate ["sum"]. tostring (); </P> <p >}</P> <p> // <summary> <br/> // remove the ListBox on the right <br/> // </Summary> <br/> /// <Param name = "sender"> </param> <br/> /// <Param name = "E"> </Param> <br/> protected void imgbtnremove_click (Object sender, imageclickeventargs e) <br/>{</P> <p> decimal sum = convert. todecimal (viewstate ["sum"]); <br/> If (lstcarright. selecteditem = NULL) <br/>{< br/> scriptmanager. registerstartupscript (this, GetType (), "84", "alert ('select the license plate number on the right');", true); </P> <p> return; <br/>}< br/> for (INT I = 0; I <lstcarright. items. count; I ++) <br/>{</P> <p> If (lstcarright. items [I]. selected) <br/>{< br/> listitem li = new listitem (); <br/> Li. TEXT = lstcarright. selecteditem. text; <br/> Li. value = lstcarright. selectedvalue; <br/> lstcarleft. items. add (LI); <br/> string [] strvalue = spit (Li. value, "*"); </P> <p> sum-= convert. todecimal (strvalue [1]); <br/> lstcarright. items. remove (lstcarright. selecteditem); <br/>}< br/> viewstate ["sum"] = sum; <br/>}< br/> txt_jsje.text = viewstate ["sum"]. tostring (); <br/> txt_ysje.text = viewstate ["sum"]. tostring (); <br/>}