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RadComBoBox And Some Focus Problems (Using JQuery)

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ComboBox
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Majid Darab
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Majid Darab asked on 14 Feb 2010, 11:22 AM
hi my dear friends

i have a little problem about using jquery...(i reeally do not know jquery but i forced to use it)

i am using vs 2008 - asp.net web app with c#

also i am using telerik controls in my pages

also i am using sqldatasources (Connecting to storedprocedures) in my pages

my pages base on master and content pages and in content pages i have mutiviews

=================================================================================

in one of the views(inside one of those multiviews)i had made two radcombo boxes for country and city requirement like cascading dropdowns as parent and child combo boxes. i used old way for doing that , i mean i used update panel and in the SelectedIndexChange Event of Parent RadComboBox(Country) i Wrote this code :

    protected void RadcomboboxCountry_SelectedIndexChanged(object o, RadComboBoxSelectedIndexChangedEventArgs e) 
     
    { 
     
    hfSelectedCo_ID.Value = RadcomboboxCountry.SelectedValue; 
     
    RadcomboboxCity.Items.Clear(); 
     
    RadcomboboxCity.Items.Add(new RadComboBoxItem(" ...""5")); 
     
    RadcomboboxCity.DataBind(); 
     
    RadcomboboxCity.SelectedIndex = 0; 
     
    } 


my child radcombo box can fill by upper code , let me tell you how : the child sqldatasource have a sp that has a parameter and i fill that parameter by this line -> hfSelectedCo_ID.Value = RadcbCoNameInInsert.SelectedValue;
RadcbCoNameInInsert.SelectedValue means country ID.

after doing that SelectedIndexChange Event of Parent RadComboBox(Country) could not be fire therefore i forced to set the autopostback property to true.

afetr doing that every thing was ok until some one told me can u control focus and keydown of your radcombo boxes

(when u press enter key on the parent combobox[country] , so child combobox gets focus -- and when u press upperkey on child radcombobox [city], so parent combobox[country] gets focus)

(For Users That Do Not Want To Use Mouse for Input Info And Choose items)

i told him this is web app , not win form and we can not do that. i googled it and i found jquery the only way for doing that ... so i started using jquery . i wrote this code with jquery for both of them :

    <script src="../JQuery/jquery-1.4.1.js" language="javascript" type="text/javascript"></script> 
     
    <script type="text/javascript"
     
    $(function() { 
     
    $('input[id$=RadcomboboxCountry_Input]').focus(); 
     
    $('input[id$=RadcomboboxCountry_Input]').select(); 
     
    $('input[id$=RadcomboboxCountry_Input]').bind('keyup', function(e) { 
     
    var code = (e.keyCode ? e.keyCode : e.which); 
     
    if (code == 13) {    -----------> Enter Key 
     
    $('input[id$=RadcomboboxCity_Input]').focus(); 
     
    $('input[id$=RadcomboboxCity_Input]').select(); 
     
    } 
     
    }); 
     
    $('input[id$=RadcomboboxCity_Input]').bind('keyup', function(e) { 
     
    var code = (e.keyCode ? e.keyCode : e.which); 
     
    if (code == 38) {       -----------> Upper Key 
     
    $('input[id$=RadcomboboxCountry_Input]').focus(); 
     
    $('input[id$=RadcomboboxCountry_Input]').select(); 
     
    } 
     
    }); 
     
    }); 
     
    </script> 


this jquery code worked BBBBBBUUUUUUUTTTTTT autopostback=true of the Parent RadComboBox Became A Problem , Because when SelectedIndex Change Of ParentRadComboBox is fired after that Telerik Skins runs and after that i lost parent ComboBox Focus and we should use mouse but we don't want it....

for fix this problem i decided to set autopostback of perentCB to false and convert

 
   protected void RadcomboboxCountry_SelectedIndexChanged(object o, RadComboBoxSelectedIndexChangedEventArgs e) 
     
    { 
     
    hfSelectedCo_ID.Value = RadcomboboxCountry.SelectedValue; 
     
    RadcomboboxCity.Items.Clear(); 
     
    RadcomboboxCity.Items.Add(new RadComboBoxItem(" ...""5")); 
     
    RadcomboboxCity.DataBind(); 
     
    RadcomboboxCity.SelectedIndex = 0; 
     
    } 


to a public non static method without parameters and call it with jquey like this : (i used onclientchanged property of parentcombo box like onclientchanged = "MyMethodForParentCB_InJquery();" insread of selectedindexchange event)

 
   public void MyMethodForParentCB_InCodeBehind() 
     
    { 
     
     
     
    hfSelectedCo_ID.Value = RadcomboboxCountry.SelectedValue; 
     
    RadcomboboxCity.Items.Clear(); 
     
    RadcomboboxCity.Items.Add(new RadComboBoxItem(" ...""5")); 
     
    RadcomboboxCity.DataBind(); 
     
    RadcomboboxCity.SelectedIndex = 0; 
     
    } 


for doing that i read the blow manual and do that step by step :

=======================================================================



http://www.ajaxprojects.com/ajax/tutorialdetails.php?itemid=732




=======================================================================

but this manual is  about static methods and this is my new problem ...

when i am using static method like :
 
    public static void MyMethodForParentCB_InCodeBehind() 
     
    { 
     
     
     
    hfSelectedCo_ID.Value = RadcomboboxCountry.SelectedValue; 
     
    RadcomboboxCity.Items.Clear(); 
     
    RadcomboboxCity.Items.Add(new RadComboBoxItem(" ...""5")); 
     
    RadcomboboxCity.DataBind(); 
     
    RadcomboboxCity.SelectedIndex = 0; 
     
    } 


so i recieved some errors and this method could not recognize my controls and hidden field...

one of those errors like this :

Error 2 An object reference is required for the non-static field, method, or property 'Darman.SuperAdmin.Users.hfSelectedCo_ID' C:\Javad\Copy of Darman 6\Darman\SuperAdmin\Users.aspx.cs 231 13 Darman

any idea or is there any way to call non static methods with jquery

(i know we can not do that but is there another way to solve my problem)???????????????


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Majid Darab
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answered on 18 Feb 2010, 06:18 AM
hi my dear friendds...
i asked this problem here because of  radcombo box  and it's focus ...
i would be really really appreciate it for your attention...
best regards
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