자바스크립트 입니다.
하나의 필드에 입력후 변환을 하면 나머지 필드를 채워줍니다.






단위변환계산기

function convertform(form){
    var firstvalue = 0;
    for (var i = 1; i <= form.count; i++) {
       // Find first non-blank entry
       if (form.elements[i].value != null && form.elements[i].value.length != 0) {
          // Verify that value is a number
          for (var j = 0; j < form.elements[i].value.length; j++) {
              var ch = form.elements[i].value.substring(j, j + 1)
              if ((ch < "0" || "9" < ch) && ch != '.') {
                 alert(" 데이터 입력이 잘못되었음: " + form.elements[i].value);
                 clearform(form);
                 return false;
              }
          }
          if (i == 1 && form.elements[2].value != "") return false;
          firstvalue = form.elements[i].value / form.elements[i].factor;
          break;
       }
    }
    if (firstvalue == 0) {
       clearform(form);
       return false;
    }
    for (var i = 1; i <= form.count; i++) {
        form.elements[i].value = firstvalue * form.elements[i].factor;
        form.elements[i].value = formatvalue(form.elements[i].value, form.rsize);
    }
    return true;
}

function formatvalue(input, rsize) {
   var invalid = "**************************";
   var nines = "999999999999999999999999";
   if (input.length <= rsize) return input;
   if (strpos(input, 'e') != -1 ||
       eval(input) > eval(nines.substring(0,rsize)+".4"))
      return invalid.substring(0, rsize);
   var rounded = "" + (eval(input) +
                 (eval(input) - eval(input.substring(0, rsize))));
   return rounded.substring(0, rsize);
}

function strpos(str, ch) {
   for (var i = 0; i < str.length; i++)
      if (str.substring(i, i+1) == ch) return i;
   return -1;
}

function resetform(form) {
    clearform(form);
    form[1].value = 1;
    convertform(form);
    return true;
}

function clearform(form) {
    for (var i = 1; i <= form.count; i++) form[i].value = "";
    return true;
}
</SCRIPT>
<font size = 4 color=#663311><b> 단위변환계산기</b></font>
<FORM >
<TABLE border=1  bgcolor =#d1e6cc cellspacing=0>
<TR>
 <TD ALIGN=CENTER><small>미터</TD>
 <TD ALIGN=CENTER><small>인치</TD>
 <TD ALIGN=CENTER><small>피트</TD>
 <TD ALIGN=CENTER><small>야드</TD>
 <TD ALIGN=CENTER><small>마일</TD>
 <TD ALIGN=CENTER><small>자</TD>
 <TD><small><INPUT TYPE="button" VALUE="Clear" onclick="clearform(this.form)"></TD>
</TR>
<TR>
 <TD><INPUT TYPE=TEXT NAME=val1 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val2 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val3 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val4 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val5 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val6 SIZE=6></TD>
 <TD><small><INPUT TYPE="button"  VALUE="변환" onclick="convertform(this.form)"></TD>
</TR>
</TABLE>
</FORM>

<FORM>
<TABLE border=1 cellspacing=0 bgcolor =#d1e6cc>
<TR>
 <TD ALIGN=CENTER><font size=2>킬로그램</TD>
 <TD ALIGN=CENTER><small>온스</TD>
 <TD ALIGN=CENTER><small>파운드</TD>
 <TD ALIGN=CENTER><small>근</TD>
 <TD ALIGN=CENTER><small>관</TD>
 <TD ALIGN=CENTER><small>돈</TD>
 <TD><small><INPUT TYPE="button" VALUE="Clear" onclick="clearform(this.form)"></TD>
</TR><TR>
 <TD><INPUT TYPE=TEXT NAME=val1 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val2 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val3 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val4 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val5 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val6 SIZE=6></TD>
 <TD><small><INPUT TYPE="button"  VALUE="변환"  onclick="convertform(this.form)"></TD>
</TR>
</TABLE>
</FORM>

<FORM>
<TABLE border=1 cellspacing=0 bgcolor =#d1e6cc>
<TR>
 <TD ALIGN=CENTER><small>m³</TD>
 <TD ALIGN=CENTER><small>리터</TD>
 <TD ALIGN=CENTER><small>갤런</TD>
 <TD ALIGN=CENTER><small>홉</TD>
 <TD ALIGN=CENTER><small>되</TD>
 <TD ALIGN=CENTER><small>말</TD>
 <TD><small><INPUT TYPE="button" VALUE="Clear" onclick="clearform(this.form)"></TD>
</TR><TR>
 <TD><INPUT TYPE=TEXT NAME=val1 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val2 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val3 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val4 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val5 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val6 SIZE=6></TD>
 <TD><small><INPUT TYPE="button"  VALUE="변환" onclick="convertform(this.form)"></TD>
</TR>
</TABLE>
</FORM>

<FORM>
<TABLE border=1 cellspacing=0 bgcolor =#d1e6cc>
<TR>
 <TD ALIGN=CENTER><small>m²</TD>
 <TD ALIGN=CENTER><small> 평</TD>
 <TD ALIGN=CENTER><small>에이커</TD>
 <TD ALIGN=CENTER><small>ft²</TD>
 <TD ALIGN=CENTER><small>yd²</TD>
 <TD ALIGN=CENTER width=55><small>&nbsp;</TD>
 <TD><small><INPUT TYPE="button" VALUE="Clear" onclick="clearform(this.form)"></TD>
</TR><TR>
 <TD><INPUT TYPE=TEXT NAME=val1 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val2 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val3 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val4 SIZE=6></TD>
 <TD><INPUT TYPE=TEXT NAME=val5 SIZE=6></TD>
 <TD>&nbsp;</TD>
 <TD><small><INPUT TYPE="button"  VALUE="변환" onclick="convertform(this.form)"></TD>
</TR>
</TABLE>
</FORM>
<script>
document.forms[0].count = 6;  // number of unit types
document.forms[0].rsize = 7;  // Rounding size, use same as SIZE
document.forms[0].val1.factor = 1;   //m
document.forms[0].val2.factor = 39.37007874;  //in.
document.forms[0].val3.factor = 3.280839895;  //ft.
document.forms[0].val4.factor = 1.093613298;  // m to yards.
document.forms[0].val5.factor = 0.00062137119; //mi.
document.forms[0].val6.factor = 3.3; //nm.

document.forms[1].count = 7;
document.forms[1].rsize = 6;
document.forms[1].val1.factor = 1.000;
document.forms[1].val2.factor = 35.273944; //oz.
document.forms[1].val3.factor = 2.2046215; //lb.
document.forms[1].val4.factor = 1.6666; //근
document.forms[1].val5.factor = 0.26666;  //관
document.forms[1].val6.factor = 266.6666; // 돈

document.forms[2].count = 6;
document.forms[2].rsize = 6;
document.forms[2].val1.factor = 1.000;   // m3
document.forms[2].val2.factor = 1000;  //리터
document.forms[2].val3.factor = 264.186; //갤론
document.forms[2].val4.factor = 5543.52; // 홉
document.forms[2].val5.factor = 554.325; //되
document.forms[2].val6.factor = 55.4325; //말

document.forms[3].count = 5;
document.forms[3].rsize = 6;
document.forms[3].val1.factor = 1.000;  //m2
document.forms[3].val2.factor = 0.3025;  //평
document.forms[3].val3.factor = 0.00024; //에이커
document.forms[3].val4.factor = 10.764; //ft2
document.forms[3].val5.factor = 1.1958; //yd2
</script>

</BODY>

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