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How to change a <select> value from JavaScript

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一生所求
一生所求 2020-11-27 18:36

I have question that seems very simple, but I just can\'t get it right. I have a

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  • 北海茫月
    2020-11-27 18:56

    You can use the selectedIndex property to set it to the first option:

    document.getElementById("select").selectedIndex = 0;
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  • 一向
    2020-11-27 19:04

    Setting .value to the value of one of the options works on all vaguely-current browsers. On very old browsers, you used to have to set the selectedIndex:

    document.getElementById("select").selectedIndex = 0;

    If neither that nor your original code is working, I wonder if you might be using IE and have something else on the page creating something called "select"? (Either as a name or as a global variable?) Because some versions of IE have a problem where they conflate namespaces. Try changing the select's id to "fluglehorn" and if that works, you know that's the problem.

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  • 执笔经年
    2020-11-27 19:04 
     <script language="javascript" type="text/javascript">
        function selectFunction() {
             var printStr = document.getElementById("select").options[0].value
            alert(printStr);
            document.getElementById("select").selectedIndex = 0;
        }
    </script>
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