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Thread: Javascript Alerts

  1. #1

    Thread Starter
    Lively Member Yumby's Avatar
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    Feb 2009
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    112

    Javascript Alerts

    My objective is to put some information from one field into another field as the user types the characters. But I'm stuck at step one. At the moment I'm just trying to get the information from the first field (and then I'll try and work out how to put it into the second field) but the code below keeps showing a blank message box after I've typed 1 character.

    Code:
    <!DOCTYPE html>
    <html>
    <head>
    <title>TRIALJS</title>
    <script>
    function myFunction()
    {
    var valone = document.getElementById('txtone').value;
    alert(valone);
    }
    </script>
    </head>
    <body>
    <p>Some text.</p>
    <input type="text" id="txtone" onkeydown="myFunction()">
    <br><br>
    <input type="text" id="txttwo">
    </body>
    </html>
    So then I tried (looking for a non-blank field)...

    Code:
    <!DOCTYPE html>
    <html>
    <head>
    <title>TRIALJS</title>
    <script>
    function myFunction()
    {
    var valone = document.getElementById('txtone').value;
    if valone != ""
    alert(valone);
    }
    </script>
    </head>
    <body>
    <p>Some text.</p>
    <input type="text" id="txtone" onkeydown="myFunction()">
    <br><br>
    <input type="text" id="txttwo">
    </body>
    </html>
    But this doesn't even create a message box. So what can I do to fix this? Thank you.

  2. #2
    Freelancer akhileshbc's Avatar
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    Trivandrum, Kerala, India
    Posts
    7,572

    Re: Javascript Alerts

    The syntax for an if statement is:

    Code:
    if(condition)
      statement;
    So try this way:
    Code:
    if (valone != "")
      alert(valone);

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  3. #3

    Thread Starter
    Lively Member Yumby's Avatar
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    Re: Javascript Alerts

    Thanks for the code but unfortunately it didn't solve my problem. Without the if statement I'm still getting a blank messagebox (after I type the 1st character.) Then, when I type the 2nd character, I get a messagebox that shows me only the 1st character I typed.

    So does anyone know why javascript shows a blank textbox after the 1st character has been typed? Thanks!

  4. #4
    Freelancer akhileshbc's Avatar
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    Trivandrum, Kerala, India
    Posts
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    Re: Javascript Alerts

    Here, I am using the KeyUp event to trigger the function, that will copies the contents of the first inputbox to the second one.
    HTML Code:
    <!DOCTYPE html>
    <html>
    <head>
    <title>TRIALJS</title>
    <script>
    function myFunction()
    {
      var valone = document.getElementById('txtone').value;
      document.getElementById('txttwo').value=valone;
    }
    </script>
    </head>
    <body>
    <p>Some text.</p>
    <input type="text" id="txtone" onkeyup="myFunction()">
    <br><br>
    <input type="text" id="txttwo">
    </body>
    </html>
    Live: http://jsfiddle.net/ykter/


    If my post was helpful to you, then express your gratitude using Rate this Post.
    And if your problem is SOLVED, then please Mark the Thread as RESOLVED (see it in action - video)
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    Skills: PHP, MySQL, jQuery, VB.Net, VB6, Photoshop...

  5. #5

    Thread Starter
    Lively Member Yumby's Avatar
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    Re: Javascript Alerts

    Thanks again for the code akhileshbc, it's exactly what I needed (if I can I'll rep you some points.)

    It'd still be good to know why I'm getting a blank messagebox though, so if anyone wants to offer an answer that would be great.

  6. #6
    King of sapila
    Join Date
    Oct 2006
    Location
    Greece
    Posts
    4,039

    Re: Javascript Alerts

    On my vs2008 it works fine
    Code:
    <script type="text/javascript">
        function myFunction() {
            var valone = document.getElementById('txtone').value;
            document.getElementById('txttwo').value = valone;
            alert(valone);
        }
    </script>
    Slow as hell.

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