ActionScriptで、全角数字を半角に変換するためには、１バイトずつ判定する必要がある。PHPがいかに便利かと思う。
こんな感じです。
応用すれば英文字も対応できるが、もう少しスマートな方法ないかなぁ・・・
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function tohalf( str ) { var len = str.length; var ret = ""; for ( i = 0; i < len; i++) { var num = str.charAt( i ).charCodeAt( 0 ); switch( num ) { case '０'.charCodeAt( 0 ): case '0'.charCodeAt( 0 ): ret += '0'; break; case '１'.charCodeAt( 0 ): case '1'.charCodeAt( 0 ): ret += '1'; break; case '２'.charCodeAt( 0 ): case '2'.charCodeAt( 0 ): ret += '2'; break; case '３'.charCodeAt( 0 ): case '3'.charCodeAt( 0 ): ret += '3'; break; case '４'.charCodeAt( 0 ): case '4'.charCodeAt( 0 ): ret += '4'; break; case '５'.charCodeAt( 0 ): case '5'.charCodeAt( 0 ): ret += '5'; break; case '６'.charCodeAt( 0 ): case '6'.charCodeAt( 0 ): ret += '6'; break; case '７'.charCodeAt( 0 ): case '7'.charCodeAt( 0 ): ret += '7'; break; case '８'.charCodeAt( 0 ): case '8'.charCodeAt( 0 ): ret += '8'; break; case '９'.charCodeAt( 0 ): case '9'.charCodeAt( 0 ): ret += '9'; break; default: // 数字以外は読み捨てるのでコメントアウト // ret += num; break; } } return ret; } |
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