Access Textbox value in Content PlaceHolder thru Javascript

Posted on 2013-05-17
Last Modified: 2013-05-27
Hi Experts,
I have a aspx page which uses a Master Page.  I have a text field inside the Content Placeholder.  I want to change the data to Uppercase whenever it is entered thru a Javascript.  The question is, how would I access the textfield in Javascript?  Please let me know.  Thank you very much in advance.
Question by:RadhaKrishnaKiJaya
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LVL 27

Accepted Solution

skullnobrains earned 250 total points
ID: 39175537
you need to apply a js function to the unchange event of your form control

use the touppercase js method to change the value.something like

you may also apply the same when the formis submitted

you probably should handle this server side if you can

Author Comment

ID: 39176129
Thank you skullnobrains,
I tried your line and got the below error message.  In fact the javascript fails and gives me this error.  When I remove the .value from the line, I get the 'null' value.  But, javascript still runs.  Any idea?  Thank you again for your help.

I am testing this line
var fname = document.getElementById('txtFName').value;

Error Message
Microsoft JScript runtime error: Object required

Assisted Solution

Sar1973 earned 250 total points
ID: 39176849
Then check your HTML, since no object named 'txtFName' may be defined.
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LVL 27

Expert Comment

ID: 39177274
yes. there should be a single element with this specific id (beware it's id not name when using the code i provided)

Author Comment

ID: 39177553
Thank you everybody for trying to help me.  My issue is not resolved yet though.  Since it is opened long, I am closing this case.

Author Comment

ID: 39179346
I've requested that this question be closed as follows:

Accepted answer: 0 points for RadhaKrishnaKiJaya's comment #a39177553

for the following reason:

Reason already provided.
LVL 27

Expert Comment

ID: 39179347
the author has a proper answer. as good as can be given without seeing the html part of the code which he did not provide

i do not care about points, but i stongly disagree with such a question closure

Expert Comment

ID: 39179436
I agree with skullNB.
LVL 27

Expert Comment

ID: 39180353
i would recommend a split between Sar1973's comment 39176849 and my first comment  39175537

Author Comment

ID: 39192388
Hi skullnobrains and Sar1973,  I really appricate your answers.  But I don't know why it did not work for me.  I am not experts on this either.  I am really sorry, but I provided my reply honestly.  Please look below for my explanation.  Hope that helps.

Here is what I did in my page load.

txtDate.Attributes.Add("onblur", "return ValidDate(this)");

This is my aspx program.

<script type="text/javascript">

     function checkdate(input) {

            var Day = input.value.split("/")[0];
            var Month = input.value.split("/")[1];
            var Year = input.value.split("/")[2];

            input.value = Day + "/" + Month.toUpperCase() + "/" + Year;


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