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Fixing "undefined" problem

Discussion in 'JavaScript' started by redhits, Aug 9, 2010.

  1. #1
    So i made a script:


    The only problem with it it's this:
    If you write something really fast at keyword, it will display "undefined" for a few moments where it have to show the text... what i can do ? is there any way at less to change the "undefined" with processing?
    redhits, Aug 9, 2010 IP
  2. lp1051

    lp1051 Well-Known Member

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    Hi SeoPink,

    it is because of your function keycount() and the useage of AJAX there. First - if you use POST request, take away the last line http.send(null); - it's useful for GET request where you pass the query directly after URL. Second - you call http.abort(); before every new call, but later in http.onreadystatechange handler you check only for readyState, not for status. Aborted request has readyState=4, but it's status is never 200 (success), and therefore you get undefined into the textarea. It's simply not sending anything back to client...

    I rewrote it without testing, but I guess it will work;)
    function keycount(xkey,divname) {
    	var backtext;
    	var contentType = "application/x-www-form-urlencoded; charset=UTF-8";
    	var sendText = document.getElementById('nicearea').value;
    	var sendKeyword = document.getElementById(xkey).value;
    	var key1 = document.getElementById('key1').value;
    	var key2 = document.getElementById('key2').value;
    	var key3 = document.getElementById('key3').value;
    	var query = "text="+escape(sendText)+"&keyword="+escape(sendKeyword)+"&key1="+escape(key1)+"&key2="+escape(key2)+"&key3="+escape(key3);
    	http.open("POST", "keycount.php", true);
    	http.setRequestHeader("Content-Type", contentType);
    	http.onreadystatechange=function() {
    		if(http.readyState == 4 && http.status == 200) {
    			var response=http.responseText;
    			var excade=response.split("@#@phpguy@#@");
    			document.getElementById(divname).innerHTML = excade[0];
    			document.getElementById('showtext').innerHTML = backtext;
    Code (Javascript):
    Btw. check JSON for sending well-formatted data with AJAX
    Last edited: Aug 9, 2010
    lp1051, Aug 9, 2010 IP