回答編集履歴
1
sample
test
CHANGED
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@@ -11,3 +11,129 @@
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結局未入力をさけるためにも送信時のチェックは必要なので
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がんばってもさほど意味がない作業になります。
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# sample
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一応形だけ
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```javascript
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<script>
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document.addEventListener('change',function(e){
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var t=e.target;
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if(t.nodeName=="SELECT" && (t.name=="year" || t.name=="month")){
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setDay();
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}
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});
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function setDay(){
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var f=document.getElementById("f1");
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var y=f.elements["year"].options[f.elements["year"].selectedIndex].value;
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var m=f.elements["month"].options[f.elements["month"].selectedIndex].value;
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var d=f.elements["day"];
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for(var i=d.options.length-1;i>0;i--){
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d.removeChild(d.options[i]);
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}
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if(y!=="" && m!==""){
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for(var i=1 ; i<=(new Date(y,m,0)).getDate(); i++){
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var n=document.createElement("option");
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n.setAttribute("value",i);
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n.appendChild(document.createTextNode(("0"+i).substr(-2,2)));
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d.appendChild(n);
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}
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}
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}
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window.onload=function(){
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var f=document.getElementById("f1");
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var y=f.elements["year"];
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var m=f.elements["month"];
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var myDate=new Date( );
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for(var i=myDate.getFullYear()-50 ; i<myDate.getFullYear( )+2 ; i++){
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var n=document.createElement("option");
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n.setAttribute("value",i);
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n.appendChild(document.createTextNode(i));
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y.appendChild(n);
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}
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for(var i=1 ; i<=12 ; i++){
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var n=document.createElement("option");
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n.setAttribute("value",i);
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n.appendChild(document.createTextNode(("0"+i).substr(-2,2)));
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m.appendChild(n);
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}
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setDay();
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}
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</script>
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<form id="f1">
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<select name="year">
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<option value="">----</option>
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</select>年
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<select name="month">
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<option value="">--</option>
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</select>月
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<select name="day">
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<option value="">--</option>
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</select>日
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```
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