Музаффар,
<form name="calc">
<input type="text" name="display" value=""><br>
<input type="button" value="1">
<input type="button" value="2">
<input type="button" value="3">
<input type="button" value="+"><br>
<input type="button" value="4">
<input type="button" value="5">
<input type="button" value="6">
<input type="button" value="-"><br>
<input type="button" value="7">
<input type="button" value="8">
<input type="button" value="9">
<input type="button" value="*"><br>
<input type="button" value="0">
<input type="submit" value="=">
<input type="reset" value="C">
<input type="button" value="/"><br>
</form>
<div id="content"></div>
<script>
document.calc.onclick = function(e) {
var t = e && e.target || event.srcElement;
if (t.type == 'button') this.display.value += t.value;
}
document.calc.onsubmit = function() {
var val = this.display.value.match(/^(-?\d+)([\+\-\*\/])(-?\d+)$/);
if (val) {
var ajax = new XMLHttpRequest();
var params = 'left=' + val[1] + '¢er=' + encodeURIComponent(val[2]) + '&right=' + val[3];
ajax.open('POST', 'asd.php', true);
ajax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
ajax.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById('content').innerHTML = this.responseText;
}
}
ajax.send(params);
} else {
alert('(Целое число)(Знак)(Целое число)');
}
return false;
}
</script>
asd.php
<?php
if (isset($_POST['left'], $_POST['center'], $_POST['right'])) {
$left = (int)$_POST['left'];
$right = (int)$_POST['right'];
$center = $_POST['center'];
$result = 0;
switch ($center) {
case '+':
$result = $left + $right;
break;
case '-':
$result = $left - $right;
break;
case '*':
$result = $left * $right;
break;
case '/':
$result = $left / $right;
}
echo $left . ' ' . $center . ' ' . $right . ' = ' . $result;
}
?>