From a table row with two dropdowns, get selected value & which drop-down changed

Question

I am trying to update two cascading drop down inside a table there are many answers on SO for drop downs, but I was unable to find help on cascading updates

Answer 1

You need to give both your elements class names and use relative selectors to select the associated element in the same row.

Assuming your html is

 // give this an id attribute
    

        

            
 ..... 
            
 ..... 
        
    

Then your script will be

$('#table').on('change', '.country', function() {
    var selectedValue = $(this).val();
    var row = $(this).closest('tr'); // get the row
    var stateSelect = row.find('.state'); // get the other select in the same row
    // make you ajax call passing the selectedValue to your controller
    // in the success callback, update the options of stateSelect 
    $.ajax({
        url: ...
        data { id: selectedValue },
        ....
        success: function(data) {
            stateSelect.empty();
            $.each(data, function(item, index) {
                stateSelect.append($('').val(iem.ID).text(item.Name));
            }
        }
    });
}

Refer also better way to load 2 dropdown in mvc for details of the code for populating cascading dropdownlists (consider caching the options as per the 2nd code example to avoid repeated ajax calls)

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