回答編集履歴
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追記
test
CHANGED
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@@ -3,3 +3,71 @@
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ただしjavascriptを最小限に抑えるために、最初のselectboxの
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変更をトリガーにajaxで２番めのselectboxを持ってきてもよいかと。
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# 追記
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```javascript
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<script>
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$(function(){
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$('[name=a]').on('change',function(){
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var idx=$(this).prop('selectedIndex');
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$('[name=b]').prop('selectedIndex',0);
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$('[name=b] option').prop('disabled',false).filter(function(i){
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return (i>0 && i<=idx);
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}).prop('disabled',true);
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}).trigger('change');
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});
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</script>
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<form>
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<select name="a">
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<option value="">--</option>
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<option value="1">1</option>
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<option value="2">2</option>
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<option value="3">3</option>
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<option value="4">4</option>
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<option value="5">5</option>
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</select>
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<select name="b">
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<option value="">--</option>
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<option value="1">1</option>
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<option value="2">2</option>
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<option value="3">3</option>
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<option value="4">4</option>
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<option value="5">5</option>
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</select>
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<input type="submit" value="go">
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</form>
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```
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