How To Present Choose Box Every Moment Multiple, Precisely Disable Multiple Selection?

I needed to display:
Influenza A virus subtype H5N1 html <select> box equally a multiple enabled or vertically expanded box (not equally dropdown list). So I ready lead box equally multiple. Then it plough outs to locomote similar this:

 <select id="myName" multiple>     <option>A</option>     <option>B</option>     <option>C</option> </select>  

Problem
But how to disable multiple selection? (i.e. to permit exclusively 1 selection)

Solution
Do non role the multiple attribute instead ready the size for it. It volition enable you lot to lead only i choice inwards the list. And it displays equally multiple lead or expanded box.

 <select id="myName" size="3">     <option>A</option>     <option>B</option>     <option>C</option> </select> 

The size attribute specifies the position out of visible options inwards a drop-down list. If the value of the size attribute is greater than 1, but lower than the full position out of options inwards the list, the browser volition add together a scroll bar to betoken that at that spot are to a greater extent than options to view.

Note: If you lot position multiple therefore user tin post away lead multiple items from the list.

source: http://stackoverflow.com/a/14155833

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