change dropdownlist selected index with javascript

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Hi,

Please any one help below requirements. It would be very useful for me . Advance Thanks

"change dropdownlist selected index with javascript"

for example I have two dropdown list in form , If I click values in first dropdown list. automaticaly respective values to show the scecond in drop down list .

A- dropdown list B- drop down list

1 4
2 5
3 6

for example If I click values "3" in first dropdown list. automaticaly respective values to show "6" the scecond in drop down list

This For your Reference

A-drop downlist B-drop downlist
3 6

Posted 5-Aug-11 0:28am

skathirmca1

Updated 31-May-16 3:27am

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koolprasad2003 · Answer 1 · 2011-08-05T00:45:00

Match the text value with the value you are given. If it is matched with the text of the option you can set the selectedIndex to that.

var dropdownlistbox = document.getElementById("DropdownID")

for(var x=0;x < dropdownlistbox.length -1 ; x++)
{
   if(givenValue == dropdownlistbox.options[x].text)

      dropdownlistbox.selectedIndex = x;
}

if you know the index then directly you can give like this

document.getElementById("DropDownID").selectedIndex = x;