Select listbox value automatically

Hi,
  I created a multiselect list, and when the result is 1 I want to select the value automatically in the select box. I am getting below error

Message: Unable to set value of the property 'selected': object is null or undefined

but I see the listbox contains a value.


please let me know how can I do it.

Thank you
code.txt
SthokalaAsked:
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basicinstinctConnect With a Mentor Commented:
well like arrays the options nodelist is "base zero".
 so if length is 1 the first index is 0

if(myoptions.length==1){
    variantSelect.options[0].selected="selected";
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