hide combobox if it's value is null and show another

Question

I have combobox1  combobox2 combobox3 combobox4 combobox5 combobox6 and button1 the comboboxes are getting their data from sql tables combobox4 combobox5 combobox6 are hidden by default combobox1  combobox2 combobox3 disabled by default I want combobox1 combobox2 combobox3 to hide themselves if their value is null and show the other hidden ones which are combobox4 combobox5 combobox6 and if combobox1 combobox2 combobox3 have value stay disabled and keep combobox4 combobox5 combobox6 hidden and the event of button1 check which 3 comboboxes are hidden and use the data in the visible ones to insert them into the table thanks in advance

sneeze snoeze · Answer

is the event combobox1_SelectedIndexChanged( object sender EventArgs e) actually fired ? What is the value of the selected index ?

mind controll · Answer

not working and I got red lines under everything is there's a way in c# not in java thanks for your help

Arunava Bhattacharjee · Answer

You need to check this in java script: function chkind(){ var dropdown1 = document.getElementById('dropdown1'); var textbox = document.getElementById('textbox'); var a = dropdown1.options[dropdown1.selectedIndex]; if(a > -1){ //disable } else //enable } }

mind controll · Answer

I used this approach : private void combobox1_SelectedIndexChanged( object sender EventArgs e) { if (combobox1.SelectedIndex > -1) { combobox1.Visible = false ; combobox3.Visible = true ; } } but not working

Arunava Bhattacharjee · Answer

Check in the JavaScript what is the SelectedIndex of Combo box if the items are null. Based on that decide which combo boxes to show and hide using display:none or visibility:hidden. In the code behind check which combo boxes are not null and pass the values to DB. Hope this helps. Please mark this as accepted.