テキストボックスの制限

質問

いつもありがとうございます。
テキストボックスがあって、最大２０文字しか入らないように制限をしています。
Formで次の画面へ飛ばす時、条件として

* 小文字のカタカナは全角のカタカナに
* 「ー」は「－」

にしたいです。
しかも３文字しかテキストボックスに入らなければ、残りの１７文字は空白にして２０文字の文字としておくりたいです。
このとき、どう書けばよいか教えて下さい。

回答No.1

BLUEPIXY · ベストアンサー

<form … onsubmit="convert()">
として
function convert(){
str=form1.text1.value;
str=str.replace(/ー/g,"－");
form1.text1.value=str;
return true;
}
の様な感じで置換をします。
半角カナから全角カナへ一発でうまくやる方法はちょっと思いつきません。
同じように、地道にやるしかないと思います。
２０文字に統一するには、
str=str+"　…２０個の全角スペース…　";
str=str.substring(0,20-1);
してやればいいです。

お礼

ありがとうございます。
大変参考になりました。
お礼が遅くなり申し訳ありません。

回答No.2

caitsith_goo

半角全角の変換こういうのはどうでしょうか。
半角カタカナの回答できないようなので全角になってますが。

function HanZenChange(){
var str = document.form.text.value;
　//ここは半角カタカナの配列です
var han = new Array("ア","イ","ウ","エ","オ","カ","キ","ク","ケ","コ","サ","シ","ス","セ","ソ",
"タ","チ","ツ","テ","ト","ナ","ニ","ヌ","ネ","ノ","ハ","ヒ","フ","ヘ","ホ",
"マ","ミ","ム","メ","モ","ヤ","ユ","ヨ","ラ","リ","ル","レ","ロ","ワ","ン",
"ガ","ギ","グ","ゲ","ゴ","ザ","ジ","ズ","ゼ","ゾ","ダ","ヂ",
"ヅ","デ","ド","バ","ビ","ブ","ベ","ボ","パ","ピ","プ","ペ",
"ポ","ヲ","ァ","ィ","ゥ","ェ","ォ","ャ","ュ","ョ","ッ","ー");
var zen = new Array("ア","イ","ウ","エ","オ","カ","キ","ク","ケ","コ","サ","シ",
"ス","セ","ソ","タ","チ","ツ","テ","ト","ナ","ニ","ヌ","ネ",
"ノ","ハ","ヒ","フ","ヘ","ホ","マ","ミ","ム","メ","モ","ヤ",
"ユ","ヨ","ラ","リ","ル","レ","ロ","ワ","ン","ガ","ギ","グ",
"ゲ","ゴ","ザ","ジ","ズ","ゼ","ゾ","ダ","ヂ","ヅ","デ","ド",
"バ","ビ","ブ","ベ","ボ","パ","ピ","プ","ペ","ポ","ヲ","ァ",
"ィ","ゥ","ェ","ォ","ャ","ュ","ョ","ッ","ー");

while(str.match(/[ヲ-ン]/)){ //ここも半角です
for(var i = 0; i < han.length; i++){
str = str.replace(han[i], zen[i]);
}
}
document.form.text.value = str;
}

お礼

ありがとうございます。
大変参考になりました。
お礼が遅くなり申し訳ありません。