|
↑
Calculators >>>
This is a very cool JavaScript calculator that does many advanced functions - cosine, sine, tangent, square root, exponents, etc.
Add the below code to the <body> section of your page:
<script
language="javascript"
type="text/javascript">
function
addChar(input,
character)
{
if(input.value
==
null
||
input.value
==
"0")
input.value
=
character
else
input.value
+=
character
}
function
cos(form)
{
form.display.value
=
Math.cos(form.display.value);}
function
sin(form)
{
form.display.value
=
Math.sin(form.display.value);}
function
tan(form)
{
form.display.value
=
Math.tan(form.display.value);}
function
sqrt(form)
{
form.display.value
=
Math.sqrt(form.display.value);}
function
ln(form)
{
form.display.value
=
Math.log(form.display.value);}
function
exp(form)
{
form.display.value
=
Math.exp(form.display.value);}
function
sqrt(form)
{
form.display.value
=
Math.sqrt(form.display.value);}
function
deleteChar(input)
{
input.value
=
input.value.substring(0,
input.value.length
-
1)
}
function
changeSign(input)
{
if(input.value.substring(0,
1)
==
"-")
input.value
=
input.value.substring(1,
input.value.length)
else
input.value
=
"-"
+
input.value
}
function
compute(form)
{
form.display.value
=
eval(form.display.value)}
function
square(form)
{
form.display.value
=
eval(form.display.value)
*
eval(form.display.value)}
function
checkNum(str)
{
for
(var
i =
0;
i <
str.length;
i++)
{
var
ch
=
str.substring(i,
i+1)
if
(ch
<
"0"
||
ch
>
"9")
{
if
(ch
!=
"/"
&&
ch
!=
"*"
&&
ch
!=
"+"
&&
ch
!=
"-"
&&
ch
!=
"."
&&
ch
!=
"("
&&
ch!=
")")
{
alert("invalid
entry!")
return
false
}
}
}
return
true
}
</script>
<FORM>
<input
name="display"
value="0"
size=25>
<br>
<input
type="button"
value="
exp "
onClick="if
(checkNum(this.form.display.value)) {
exp(this.form) }">
<input
type="button"
value="
7 "
onClick="addChar(this.form.display,
'7')">
<input
type="button"
value="
8 "
onClick="addChar(this.form.display,
'8')">
<input
type="button"
value="
9 "
onClick="addChar(this.form.display,
'9')">
<input
type="button"
value="
/ "
onClick="addChar(this.form.display,
'/')">
<br>
<input
type="button"
value="
ln "
onClick="if
(checkNum(this.form.display.value)) {
ln(this.form) }">
<input
type="button"
value="
4 "
onClick="addChar(this.form.display,
'4')">
<input
type="button"
value="
5 "
onClick="addChar(this.form.display,
'5')">
<input
type="button"
value="
6 "
onClick="addChar(this.form.display,
'6')">
<input
type="button"
value="
* "
onClick="addChar(this.form.display,
'*')">
<br>
<input
type="button"
value="
sqrt "
onClick="if
(checkNum(this.form.display.value)) {
sqrt(this.form) }">
<input
type="button"
value="
1 "
onClick="addChar(this.form.display,
'1')">
<input
type="button"
value="
2 "
onClick="addChar(this.form.display,
'2')">
<input
type="button"
value="
3 "
onClick="addChar(this.form.display,
'3')">
<input
type="button"
value="
- "
onClick="addChar(this.form.display,
'-')">
<br>
<input
type="button"
value="
sq "
onClick="if
(checkNum(this.form.display.value)) {
square(this.form) }">
<input
type="button"
value="
0 "
onClick="addChar(this.form.display,
'0')">
<input
type="button"
value="
. "
onClick="addChar(this.form.display,
'.')">
<input
type="button"
value="
+/- "
onClick="changeSign(this.form.display)">
<input
type="button"
value="
+ "
onClick="addChar(this.form.display,
'+')">
<br>
<input
type="button"
value="
( "
onClick="addChar(this.form.display,
'(')">
<input
type="button"
value="
cos "
onClick="if
(checkNum(this.form.display.value)) {
cos(this.form) }">
<input
type="button"
value="
sin "
onClick="if
(checkNum(this.form.display.value)) {
sin(this.form) }">
<input
type="button"
value="
tan "
onClick="if
(checkNum(this.form.display.value)) {
tan(this.form) }">
<input
type="button"
value="
) "
onClick="addChar(this.form.display,
')')">
<br>
<input
type="button"
value="
Clear "
onClick="this.form.display.value
= 0 ">
<input
type="button"
value="
Back Space "
onClick="deleteChar(this.form.display)">
<input
type="button"
value="
Enter "
name="enter"
onClick="if
(checkNum(this.form.display.value)) { compute(this.form) }">
</FORM>
|
→ R7
|
