PHP Get value from a button without submitting
Question
I have a long form. On one part the user has to choose between different options before introducing some information and then create the account.
I tried doing something like
<form>
<input type="button" value="0" name="button">
<input type="button" value="1" name="button">
<input type="button" value="2" name="button">
</form>
<button>Create account</button>
<?php
if(!empty['button']){
$btn_val = $_POST['button'];
$sql = "INSERT INTO table btn_value VALUES :value";
$stmt = $conn->prepare($sql)
$stmt->bindParam(':value', $btn_val);
$stmt->execute();
}
?>
but when I try submitting it PHP doesn't retrieve those values. I've tried this solution with Javascript but it doesn't work. Some other answers which work is to use a radio but that will affect the frontend since I need to display a button.
2 answers
solution1
0 2021-11-07 21:05:51
The only way to submit information to a database without actually submitting the file is with asynchronous javascript.
to grab the information with the click of a button, you need to create an onclick event on the button which will trigger a function to grab the information you want to send. After that, you will open a connection to php to send the information to the database.
Since PHP only works when the page is being loaded, you need to send the information to a different PHP script to actually send the data to the database.
Look into XMLHttpRequest
Eventually, you will get something like:
xml = new XMLHttpRequest();
create AJAX object
xml.open("POST",'yourphpscript.php',true)
set up connection to php script with the post method, and boolean value for asynchronous
xml.send();
send request.
for more info: https://www.w3schools.com/js/js_ajax_intro.asp
solution2
0 2021-11-07 21:47:34
You can use Jquery to get the value of the clicked button and submit that in a hidden input field to server.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<form method="POST">
<input type="button" id="mybutton1" name="mybutton1" value="0">
<input type="button" id="mybutton2" name="mybutton2" value="1">
<input type="button" id="mybutton3" name="mybutton3" value="2">
<input type="hidden" id="selectedButtonValue" value="" name="selectedButtonValue">
<button>Create account</button>
</form>
<script>
$("input").click(function()
{
var clickedButton=$(this).val();
document.getElementById("selectedButtonValue").value=clickedButton;
});
</script>
<?php
if(isset($_POST["selectedButtonValue"]))
{
echo $_POST["selectedButtonValue"];
}
?>
</body>
</html>
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