JavaScript控制ComboBox中Option的增加和删除(原)
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<html>
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<head>
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<title> Demo </title>
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<script language=javascript>
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function deloption(){
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var obj=document.getElementById("sel").options;
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if (obj.length > 1){
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obj.options.remove(obj.length - 1);
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}
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}
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function addoption()
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{
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var obj=document.getElementById("sel").options;
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var opt = new Option("newoption" + obj.length, obj.length );
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obj.options.add(opt);
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}
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</script>
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</head>
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<body>
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<select name="sel">
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<option>one
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</select>
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<input type="button" onclick="addoption()" value="ADD">
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<input type="button" onclick="deloption()" value="DEL">
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</body>
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</html>
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