POST FormData para php usando javascript e XMLHTTPRequest
No momento, tenho dois arquivos, index.htm e accessdata.php. Isto é o que eu tenho no index.htm:
<html>
<head>
<script>
function postData() {
var xmlhttp=new XMLHttpRequest();
var url = "accessdata.php";
var checkBoxes_formData = new FormData(document.getElementById("checkBoxes"));
xmlhttp.open("POST",url,true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send(checkBoxes_formData);
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById("result").innerHTML=xmlhttp.responseText;
}
}
}
</script>
</head>
<body>
<button type="button" onclick="postData()">POST</button>
<form id=checkBoxes>
<table>
<tr><input type="checkbox" name="opt1" value="blue" checked> Blue</td>
<tr><input type="checkbox" name="opt2" value="yellow"> Yellow</td>
</table>
</form>
<p id="result"></p>
</body>
</html>
e é isso que eu tenho no accessdata.php:
<?php
$opt1=$_POST['opt1'];
echo $opt1;
echo "bla";
?>
Agora
<p id="result"></p>
"bla" aparece, mas não "azul" ou "amarelo".
O que estou fazendo errado?
O CÓDIGO HTML CORRETO ABAIXO !!
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>POST PHP XMLHTTPRequest</title>
<script>
function postData() {
var xmlhttp=new XMLHttpRequest();
var url = "accessdata.php";
var checkBoxes_formData = new FormData(document.getElementById("checkBoxes"));
xmlhttp.open("POST",url,true);
xmlhttp.send(checkBoxes_formData);
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
document.getElementById("result").innerHTML=xmlhttp.responseText;
}
}
}
</script>
</head>
<body>
<button type="button" onclick="postData()">POST</button>
<form id="checkBoxes">
<input type="checkbox" name="opt1" value="blue"> Blue
<input type="checkbox" name="opt2" value="yellow" checked> Yellow
</form>
<p id="result"></p>
</body>
</html>