将输入值输入php变量

Question

Is there any method to take value of the input to a php variable.

<input type="text" name="s_amount" style='width:20%;' required>

I want value of this s_amount to take into a php variable $s_amount. This code is already inside a form. I want this conversion happen before submitting the form.

Answer 1

You can't convert a javascript variable into a php variable without communication with the server. So if you would like to turn a client side variable (your input value) into a php variable BEFORE submitting a form you'll need to post/get this variable to the server in a separate request. The best way to do this is by an asynchronous ajax call. If you are using jquery this can be very simple:

$.ajax({
    url: '/path/to/file.php',
    type: 'POST',
    dataType: 'text',
    data: {param1: $("input[type='text'][name='s_amount']").val()},
})
.done(function(response) {
    console.log("response");
    //do something with the response
})
.fail(function() {
    console.log("error");
})
.always(function() {
    console.log("complete");
});

On the server you can receive this value by getting the posted data like so

$myphpvariable= $_POST['param1'];
//here you can manipulate/validate your variable and echo something back to the client
echo 'this is my php variable: '.$myphpvariable;

Now your ajax call will receive "this is my php variable: [x]" in its .done() callback.

EDIT: don't forget you have a javascript console in your browser (for example firebug). this can be very handy to see what's going on.