react-examples/professional_javascript_for_web/ch14/SelectboxExample01.htm at master · zhangjunhd/react-examples · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Selectbox Example</title>
    <script type="text/javascript" src="EventUtil.js"></script>
</head>
<body>

    <form method="post" action="javascript:alert('Form submitted!')" id="myForm">
        <div>
            <label for="selLocation">Where do you want to live?</label>
            <select name="location" id="selLocation">
                <option value="Sunnyvale, CA">Sunnyvale</option>
                <option value="Los Angeles, CA">Los Angeles</option>
                <option value="Mountain View, CA">Mountain View</option>
                <option value="">China</option>
                <option>Australia</option>
            </select>
        </div>
        <div>
            <input type="button" value="Select first option" id="btnFirst" />
            <input type="button" value="Select second option" id="btnSecond" />
            <input type="button" value="Get selected option" id="btnSelected" />
        </div>
    </form>
    <script type="text/javascript">
        (function(){

            var btn1 = document.getElementById("btnFirst"),
                btn2 = document.getElementById("btnSecond"),
                btn3 = document.getElementById("btnSelected"),
                selectbox = document.getElementById("selLocation");

            EventUtil.addHandler(btn1, "click", function(event){
                selectbox.selectedIndex = 0;
            });
            EventUtil.addHandler(btn2, "click", function(event){
                selectbox.selectedIndex = 1;
            });
            EventUtil.addHandler(btn3, "click", function(event){
                var selIndex = selectbox.selectedIndex;
                var selOption = selectbox.options[selIndex];
                alert("Selected index: " + selectbox.selectedIndex + "\nSelected text: " + selOption.text + "\nSelected value: " + selOption.value);
            });

        })();

    </script>
</body>
</html>