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  入力された文字列の長さを返す

getStringLength

int getStringLength(formElement)
入力された文字列の長さを返します。

パラメータ:

formElement - form.element

戻り値:

入力された文字列の長さ

<script type="text/javascript" language="javascript">
<!--
// 文字列の長さを返す(IE&NN&OPERA対応関数)
function getStringLength(formElement) {
    var strlen = 0, count = 0;
    var flag = false;
    var str_s = formElement.value;
    while ( isNaN(str_s.charCodeAt(count) ) == false ) {
        if ( str_s.charCodeAt(count) > 255 ){
            if ( str_s.charCodeAt(count) >= 0xff61 && str_s.charCodeAt(count) <= 0xff9F ){
                strlen++;
            } else {
                strlen +=2;
            }
        } else {
            strlen++;
        }
        count++;
    }
    return strlen;
}

// 使用例
function check(form) {
    if( getStringLength(form.param) > 10 ){
        alert("半角10文字を超えています。");
        form.param.focus();
        return;
    }
}
// -->
</script>
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