JavaScript Code Is Not Working In Ajax Model PopUp

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hello friends,

C#

in my webpage in a model PopUp Window i am comparing ages present in two textBox,using javascript but somehow it is not working. kindly help to overcome from this issue. Thanks In Advance. my javascript code is:
<pre lang="Javascript">
function CompareAge() {
        var maxage = document.getElementById('<%=txtMaxAge.ClientID%>');
        var minage = document.getElementById('<%=txtMinAge.ClientID%>');
        var val = 'false';
        if (maxage>=minage) {               
            val = 'true';
            return true;
        }
        if (val == 'false') {
            alert('Max-Age Alaways greater than or Equal Min-Age');
            return false;
        }
    }

ASP.NET

<td>
<asp:TextBox ID="txtMaxAge" runat="server" CssClass="TextBox mytextboxinPopUp"></asp:TextBox>
</td>
<td>
<asp:TextBox ID="txtMinAge" runat="server" CssClass="TextBox mytextboxinPopUp"></asp:TextBox>
</td>

ASP.NET

<ul>
                                                            <li>
                                                                <asp:Button ID="btnCancelInPopUpReservation" runat="server" CssClass="button" Text="Cancel" />
                                                            </li>
                                                            <li>
                                                                <asp:Button ID="btnSaveInPopUpReservation" runat="server" CssClass="button" Text="Save" OnClick="btnSaveInPopUpReservation_Click" ValidationGroup="g" OnClientClick="if(!CompareAge()) return false;"/>
                                                            </li>
                                                        </ul>

Posted 10-Feb-14 1:45am

Amit Kumar143

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W∴ Balboos, *GHB* · Accepted Answer · 2014-02-10T02:10:00

The following are relevant in straight javaScript pages and ASP.NET may give you some additional options, but:

Although there are some ways around it, javaScript's are not executed on the page when put there by a AJAX. They are present if you, for example a function executed later from the page, but they are not run automatically.

There are a few ways around this: you can change your strategy and have the execution reload the page.

If practical, you can have you popup message executed in the javaScript used to make the AJAX call as part of the return from (in my case, php). A popup already on the page will run and you can change the data it will use at the AJAX return.

Something like:

xmlhttp.onreadystatechange=function() {
  if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) {
       var ajaxRtn = xmlhttp.responseText; 
       window.alert(ajaxRtn); // This is already part of page, it will execute
  } // if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200)
} // xmlhttp.onreadystatechange=function()

the above is just part of the ajax call as done in straight html/javascript/php - but it should point you in the way you need to go if it's applicable.