Inserting the value of a java script variable into a php variable [duplicate]

Question

I have seen many questions as to putting a php value into a javascript variable however i have not seen any that put a javascript variable into a php variable. so my question is is there a way to do this, and if so could you help me or at least point me in the right direction.

my code so far is this:

<script>
function CheckForm()
{
var inputElement = document.getElementsByTagName("input");

if((inputElement[0].value !=="first" && inputElement[0].value !=="") && 
    (inputElement[1].value !=="Initial" && inputElement[1].value !=="") && 
    (inputElement[2].value !=="last" && inputElement[2].value !=="") && 
    (inputElement[3].value !=="[email protected]" && inputElement[3].value !=="") && 
    (inputElement[4].value !=="") && 
    (inputElement[5].value !=="#" && inputElement[5].value !=="") && 
    (inputElement[6].value !=="Lot" && inputElement[6].value !=="") && 
    (inputElement[7].value !=="Evt. Name" && inputElement[7].value !=="") && 
    (inputElement[8].value !=="xx/xx/xxxx" && inputElement[8].value !=="") && 
    (inputElement[9].value !=="xx/xx/xxxx" && inputElement[9].value !=="") && 
    (inputElement[10].value !=="xx:xx" && inputElement[10].value !=="") &&
    (inputElement[11].value !=="") &&
    (inputElement[12].value !=="xx:xx" && inputElement[12].value !=="") &&
    (inputElement[13].value !=="") &&
    (inputElement[14].value !=="") &&
    (inputElement[15].value !=="") &&
    (inputElement[16].value !=="x.xHours/Time Range" && inputElement[16].value !==""))
{
    SendMail();
}
else
{
    alert("One or more fields were not filled in correctly. Please try again.");
}
}

function GetBody()
{
var inputElement = document.getElementsByTagName("input");
var addInfo = document.getElementsByTagName("textarea");
var msg = "";

var line1= ("First Name: " + inputElement[0].value);
var line2= ("Middle Initial: " + inputElement[1].value);
var line3= ("Last Name: " + inputElement[2].value);
var line4= ("Email: " + inputElement[3].value);
//OTHER LINES OF MESSAGE HERE

msg = (line1 + "\n" + line2 + "\n" + line3 + "\n" + line4 + "\n" + line5 + "\n" + line6 + "\n" + line7 + "\n" + line8 + "\n" + 

line9 + "\n" + line10 + "\n" + line11 + "\n" + line12 + "\n" + line13 + "\n" + line14 + "\n" + line15 + "\n" + line16 + "\n" + 

line17);
return msg;
}

function SendMail()
{
    var to = "[email protected]"
    var from = document.getElementsByTagName("input")[3].value;
    var subject = "Parking Lot Request";
    var msg = GetBody();

<?php 
$to = "GET to";
$subject =  "GET subject";
$message =  "GET msg";
$from =  "GET from";
$headers = "From: " . $from;
mail($to, $subject, $message, $headers);
mail($from, $subject, $message, $headers);
echo "Request has been sent. Also a copy has been sent to you.";

?>    
}
</script>

unless there is something I'm missing, I don't want to use forms as i have already found that as a possible solution however the post function which i assume is why your pointing me there from what i understand requires HTML5. but i need this compatable with old browsers as well. probally something i should have mentioned in the original post. — Dylan
– Dylan, Commented Jul 31, 2013 at 18:47
@Dylan — Nobody has mentioned anything that was introduced in HTML 5. — Quentin
– Quentin, Commented Jul 31, 2013 at 18:48
@Quentin someone had posted about a link to w3schools page on forms, which uses the html tag form with the attribute method="post", which from what i saw on the page on html forms is something new in html5. that person apparently removed that post before i finished posting that comment. — Dylan
– Dylan, Commented Jul 31, 2013 at 19:01

Samuel Reid · Accepted Answer · 2013-07-31 18:51:24Z

2

If you're trying to do it all on the same page, it cannot be done. The php runs and renders into HTML and Javascript before the page ever gets to your browser, so your browser cannot possibly change a PHP variable on the same page.

Now, you can definitely send an AJAX request to another, or even the same, PHP page on your server, but that PHP will also run and finish before you ever see the result in your browser. Anything you want PHP to do that involves getting a variable from Javascript, you'll have to use AJAX.

answered Jul 31, 2013 at 18:51

Samuel Reid

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3 Comments

Dylan Over a year ago

thanks, that's the kind of answer i was looking for...off to research ajax...anyone else ever feel like smashing their head into a wall...or keyboard?

Samuel Reid Over a year ago

If you're researching AJAX, I'd definitely look at the w3schools tutorial (despite what a lot of people on here say), and then look at jQuery's ajax functions. jQuery will simplify it for you once you actually know what's going on behind the scenes.

Kevin Lynch Over a year ago

An Ajax post request on the jquery website is a neat little nice of code to start off with

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