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Editorial Team
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Asked: 2026-06-15T01:18:59+00:00

i was trying to add an exception like if user input nothing or input

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i was trying to add an exception like if user input nothing or input wrong ‘Contact ID’ and press enter, an error message will come out & notifying user that ID not found. any help? thanks in advance:) here is my index.html file.

<html> 
    <body> 
        <script language="javascript" type="text/javascript">

    function ajaxFunction(e){
    var e=e || window.event;
    var keycode=e.which || e.keyCode;
    if(keycode==13 || (e.target||e.srcElement).value==''){ 
    var http;  // The variable that makes Ajax possible! 

    try{ 
        // Opera 8.0+, Firefox, Safari 
        http = new XMLHttpRequest(); 
    } catch (e){ 
        // Internet Explorer Browsers 
        try{ 
            http = new ActiveXObject("Msxml2.XMLHTTP"); 
        } catch (e) { 
            try{ 
                http = new ActiveXObject("Microsoft.XMLHTTP"); 
            } catch (e){ 
                // Something went wrong 
                alert("Your browser broke!"); 
                return false; 
            } 
        }
    }

    var url = "getagentids.php?param=";
                var idValue = document.getElementById("agid").value;
                var myRandom = parseInt(Math.random()*99999999);  // cache buster
                http.open("GET", "getagentids.php?param=" + escape(idValue) + "&rand=" + myRandom, true);
                http.onreadystatechange = handleHttpResponse;
                http.send(null);
         function handleHttpResponse() {
                    if (http.readyState == 4) {
                        results = http.responseText.split(",");
                        document.getElementById('agfn').value = results[0];
                        document.getElementById('agsal').value = results[1];
                        document.getElementById('agtel').value = results[2];
                        document.getElementById('agid').value = results[3];
                    }
                } 
    }
}

</script> 

       <form>
            <table>
                <tr>
                    <td>Contact ID:</td>
                    <td><input id="agid" type="text"
                               name="contactid" onkeyup="ajaxFunction(event)"></td>
                </tr>
                <tr>
                    <td>Tel Number:</td>
                    <td><input id="agtel" type="text"
                               name="contacttel"></td>
                </tr>
                <tr>
                    <td>Name:</td>
                    <td><input id="agfn" type="text"
                               name="contactfullname"></td>
                </tr>
                <tr>
                    <td>Salutation:</td>
                    <td><input id="agsal" type="text"
                               name="contactsalutation"></td>
                </tr>
                <tr>
                    <td><input type="reset" value="Clear"></td>
                    <td></td>
                </tr>
            </table>
        </form>

    </body> 
</html>
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1 Answer

  1. Editorial Team

    Here is how I would do the basic validation using jQuery.

    $(document).ready(function(){
    $('#contact').keypress(function(e){ //when user presses a key in that Input Box
      var code = (e.keyCode ? e.keyCode : e.which);
      if(code == 13) // check if it is Enter Key
      {
        if($(this).val().trim().length == 0) // check if it is empty
            alert("Error: Shouldn't be empty !");
        else
        {
            // You are good to go here
        }
      }
    });
});​

    HTML:

    <input id="contact" name="contact" value="" />​

    If you wish to test it live, goto: http://jsfiddle.net/NFSTL/

    I binded the KeyPress event to that InputBox.

    Hope it helps. 🙂

    EDIT

    Without using jQuery:

    function ajaxFunction(e){
    var code;
    if (!e) var e = window.event;
    if (e.keyCode) code = e.keyCode;
    else if (e.which) code = e.which;

    if (e.target) targ = e.target;
    else if (e.srcElement) targ = e.srcElement;
    if (targ.nodeType == 3) // defeat Safari bug
        targ = targ.parentNode;

    if(code==13)
    {
        if(targ.value.trim().length == 0)
            alert("Error: This shouldn't be empty!");
        else
        {
            //do the sending and receiving of data here...
        }
    }
}​

    HTML:

    <input id="agid" type="text" name="contactid" onkeyup="ajaxFunction(event)" />​

    For live testing: http://jsfiddle.net/SYf4C/

    Here’s an excellent tutorial I used: quirksmode.org/js/events_properties

    I would say that, jQuery makes life easier. 🙂
    Because it is a JavaScript library composed to work in almost all browsers.

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