how to apply text box value to label using javascript?

try onkeypress event of textbox..  
 

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function settext(valueData)
{
  
    document.getElementById('<%=Label6.ClientID%>').innerHTML = valueData;
}

 
HTML
 

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<asp:textbox id="txtbox1" runat="server" onkeypress="settext(this.value)" >
</asp:textbox>