How to send textbox value to a CGI script

Question

I have a textbox with id kTb. When I click the button after entering some value in the textbox, the below changeV(str) is called inside a javascript ('onClick="changeV(kTb.value)"'). The 'alert(str)' gives me the value I entered in the textbox but when I pass it 'urll = "uSetENV.cgi?kullaTest=str"', I am NOT getting the entered value, its just str. Could you please let me know how to pass/get the entered value, kindly let me know if I am NOT clear, thanks.

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function changeV(str)

{

alert("starting change value");
alert(str);
urll = "uSetENV.cgi?kullaTest=str";
var reqq

//fw_setenv kullaTest str;
    if (window.XMLHttpRequest) {
    reqq = new XMLHttpRequest();
    reqq.open("GET", urll, true);
    reqq.setRequestHeader( "If-Modified-Since",
                "Sat, 1 Jan 2000 00:00:00 GMT" );
    reqq.send(null);
// branch for IE/Windows ActiveX version
} else if (window.ActiveXObject) {
    reqq = new ActiveXObject("Microsoft.XMLHTTP");
    if (reqq) {
        reqq.open("GET", urll, true);
            reqq.setRequestHeader( "If-Modified-Since",
                "Sat, 1 Jan 2000 00:00:00 GMT" );
        reqq.send();
    }
}
alert("done change value");

}

Answer 1

Use jQuery - http://api.jquery.com/jQuery.post/

And use POST, not GET.

alert("starting change value");
alert(str);
$.post('uSetENV.cgi', {'kullaTest': str}, function(data) {
   str = data;
   alert("done change value");
   alert(str);
});

alert('Here str is still not changed because AJAX requests are asynchronous');

Answer 2

JavaScript doesn't have a symbol to indicate a variable (i.e. foo is a variable and doesn't need to be named $foo), so you can't perform interpolation of variables in strings. You have to build your string explicitly.

You should also deal with characters that have special meaning in URIs using encodeURIComponent.

urll = "uSetENV.cgi?kullaTest=" + encodeURIComponent(str);