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Hi all master and expert coders
I am working on a calculator which using the instructor’s codes from the school. The problem that I having right now is the operator. I have successfully complete only the addition, but could not manage on subtraction and the rest operator. I hope experienced codes would help me out on this. Below is my codes.
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “
<html xmlns=”
<head>
<script type=”text/javascript”>
function calculate() {
var value1 = parseInt(validate(document.getElementById(“value1”).value));
var value2 = parseInt(validate(document.getElementById(“value2”).value));
radioButtonCheck();
checkboxCheck();
dropDownListCheck();
document.getElementById(“result”).value = addition(value1, value2);
document.getElementById(“result”).value = subtraction(value1, value2);
document.getElementById(“result”).value = multiplication(value1, value2);
document.getElementById(“result”).value = division(value1, value2);
}
function validate(value) {
if (value == null || value == “”) {
alert(“Required Field”);
return 0;
} else if (isNaN(value)) {
alert(“Must be a number”);
return 0;
}
else return value;
}
function addition(value1, value2){
return value1 + value2;
}
[COLOR=”Red”]// trying to use the same addition return statement but fail.
function radioButtonCheck() {
if ((document.getElementById(“radio1”).checked == false)
&& (document.getElemtById(“radio2”).checked == false)) {
alert(“Please select a radio button”);
valid = false;
}
}
function checkboxCheck() {
if ((document.getElementById(“cbox1”).checked == false)
&& (document.getElementById(“cbox2”).checked == false)) {
alert(“Please select a checkbox”);
valid = false;
}
}
function dropDownListCheck() {
if ((document.getElementById(“ddlOperator”).selectedIndex == 0)) {
alert(“Please select a operator”);
valid = false;
}
}
</script>
<title>Calculator By Alsus</title>
</head>
<body>
<h2>Calculator</h2>
<table border = “1”>
<tr>
<td>Value 1:</td>
<td><input type=”text” id=”value1″ name=”value1″ /></td>
</tr>
<tr>
<td>Value 2:</td>
<td><input type=”text” id=”value2″ name=”value2″ /></td>
</tr>
<tr>
<td>Operator:</td>
<td><input type=”text” id=”Operator” name=”Operator” /></td>
</tr>
<tr>
<td><input type=”radio” id=”radio1″ name=”radio1″ value=”radio1″ />Radio1<br /></td>
<td><input type=”radio” id=”radio2″ name=”radio2″ value=”radio2″ />Radio2<br /></td>
</tr>
<tr>
<td><input type=”checkbox” id=”cbox1″ name=”cbox1″ value=”cbox1″ />Checkbox 1<br /></td>
<td><input type=”checkbox” id=”cbox2″ name=”cbox2″ value=”cbox2″ />Checkbox 2<br /></td>
</tr>
<tr>
<td>
<select id=”ddlSelect”>
<option value=”+”>+</option>
<option value=”-“>-</option>
<option value=”*“>
<option value=”/”>/</option>
</select>
</td>
<td> </td>
</tr>
<tr>
<td>Result:</td>
<td><input type=”text” id=”result” name=”result” /></td>
</tr>
</table>
<input type=”submit” id=”btn_sub” name=”btn_sub” value=”Submit” onclick=”calculate()” />
<input type=”reset” id=”btn_res” name=”btn_res” value=”Reset” />
</body>
</html>