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POupdate textbox when changed without refreshing
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  1. POupdate textbox when changed without refreshing
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    copied!<p>I'm working on my own aspx program and now i have a calculator which i want to be able to fill in some values and when you press tab to the next value and fill it in it will automatically calculate and write it into a textbox(or label). this must be without having to refresh the page. would this be possible in combination with c# or would i need to look for php + ajax to get this done?</p> <p>i had the following coded:</p> <pre><code>&lt;asp:TextBox ID="tbx_rms" onchanged="textboxcalc" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:TextBox ID="tbx_volt" onchanged="textboxcalc" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:TextBox ID="tbx_anw1" Enabled="false" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:TextBox ID="tbx_anw2" Enabled="false" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:TextBox ID="tbx_eff" onchanged="textboxcalc" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;asp:TextBox ID="tbx_anw3" Enabled="false" runat="server"&gt;&lt;/asp:TextBox&gt; </code></pre> <p>and this is the c# code:</p> <pre><code>public void textboxcalc(object sender, EventArgs e) { if (tbx_rms.Text != "" &amp;&amp; tbx_volt.Text != "") { double rms = Convert.ToDouble(tbx_rms.Text); double volt = Convert.ToDouble(tbx_volt.Text); double ant = Convert.ToDouble(rms / volt); if (tbx_eff.Text != "") { double effi = Convert.ToDouble(tbx_eff.Text); double tot = Convert.ToDouble((effi / ant) * 100); tbx_anw3.Text = Convert.ToString(tot); } tbx_anw1.Text = Convert.ToString(ant); tbx_anw2.Text = Convert.ToString(ant); } </code></pre> <p>I hope it is clear enough what my intentions are and if not i will happily answer any questions.</p>
 

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