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HTML document using JavaScript.?
I want 4 radio buttons, Addition, Subtraction,Multiplication and Division. Upon clicking any one of them and then Submit, a prompt box should appear where the 1st number is entered.Then after the OK button is pressed, another prompt box should appear.Upon clicking OK again,the result should appear. Now I know how to do the latter half of the program, but I haven't used radio buttons before. I will be grateful to anyone who helps.
Thanks,
Sachin
2 Answers
- richarduieLv 61 decade agoFavorite Answer
<html>
<head>
<script type="text/javascript">
function doOp( b ) {
// get the collection of the radio button
// for the form
var radios = b.parentNode.op;
// how many radio buttons
var last = radios.length;
// initialize operation holder here to
// keep in function scope
var op;
for (var i = 0; i < last; i++) {
// find radio that is checked and capture
// its operation
if (radios[ i ].checked) {
op = radios[ i ].value;
// quit {for} block as soon as found
break;
}
}
// prompt for input values
var n1 = prompt( 'enter your first number', 0 );
var n2 = prompt( 'enter your second number', 0 );
// verify that division by zero has not been
// requested - if it has warn user and exit
if ('/' == op && 0 == n2) {
alert( 'division by zero is undefined' );
return;
}
// compose expression to be evaluted
var x = n1 + op + n2 ;
// notify user of expression and answer
alert( x + ' = ' + eval( x ) );
}
</script>
</head>
<body>
<!--
Give all radio buttons the same name attribute - this ties them
together logically, so only one button can be checked at a time.
Give each radio the value that is the arithmetic operation to be
performed for that button.
-->
<form>
<input type="radio" name="op" value="+" /> Add
<input type="radio" name="op" value="-" /> Subtract
<input type="radio" name="op" value="*" /> Multiply
<input type="radio" name="op" value="/" /> Divide
<input type="button" value="do chosen operation" onclick="doOp( this )" />
</form>
</body>
</html>
- ?Lv 44 years ago
No via fact Javascript would not have report io. It additionally lacks get admission to the the checklist source that it rather is resident in. You do have get admission to to particular components in the checklist as long as they are defined in the previous the Javascript is achieved.
