Javascript get form value in URL without jQuery

If data is submitted via POST through the classic HTML form method is it possible to access those values using standard Javascript without libraries? How would this be done?

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Edit for clarity: The variables have been posted. I am trying to access those values via javascript.

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Thinking outside the box: (A hack that should never see the light of day)

For this example the posted variable is "a":

var val=document.URL;
var start;
start = val.search(/a=/);
var end;
end = val.search(/&/);
var thispos = val.substring(start+2,end);

1. document.URL returns the url of the current site.
2. val.search returns the position of the first occurrence of the regular expression in the parameter field.
3. substring the two and...
4. thispos now contains the posted variable.

Brutal but functional. Is this too terrible to be an answer?

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use:

var myField = document.getElementById('myFieldId');

then myField.value will contain the value.

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If you have submitted the page, then you have to get the form data using PHP. Here is a tutorial that should help: http://www.phpf1.com/tutorial/php-form.html

But if you decide to test jQuery, you can use this:

jQuery('#submit').live('click', function() 
{
  var form_data = jQuery("#data_form").serialize();  

  //Save data
  jQuery.ajax({
    url: siteURL +"/path/to/php/file/jquery.php",
    data: {formData : form_data,
    success: (function(data) {
      //data is whatever you return from jquery.php
      //I use json for return data
      alert('Data has been saved');
    }),
    dataType: 'json'
  });

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After a post, the data is send to the server, javascript cant do anything with that since its client side. What you can do is pre-check with document.getElementById('formid') and use those values in the form. After validating or doing what you want to do, end with form.submit() to really send it to the server.

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function getUrlInfo() {                 
  var data = window.location.search.substring(1).split("&");
  //returns an array of strings containing the params and their values   
  // data = [ "param=value","param=value","param=value"]

  var params1Array = data[0].substring(0).split("=");              
  //Splits the first string element at the "=" symbol and 
  //returns an array with the param and value 
  //param1Array = ["param","value"]

  var param1Value = param1Array[1].replace("+", " ");
  //Gets the value from the second element in the param1Array
  //Replaces the spaces, if any, in the second element, 
  //which is the value of the url param

   var param2Array = data[1].substring(0).split("="); 
    //Repeat steps for the second param element,in the url params data array 
    var param2Value= param2Array[1].replace("+", " ");
      return {
            param1Value,
            param2Value
         }
      };

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The submitted data (either POST or GET) is proccesed on the server side. Javascript runs on the client-side so you can't access the variables from the page receiving the form request. But you can access them before the post using the input field id (specially to check the input values before sending them).