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Como validar el TextBox que se encuentra dentro de un Repeater


Roberto Eder

Como puedo validar el TextBox con ID txtCodigoArticulo para saber si esta vacio, esta dentro de un Repeater y no me esta dejando tomar el
id lo quiero validar con la función ValidaComplemento() pero no toma encuenta el ID txtCodigoArticulo?

mi código es el siguiente

function ValidaComplemento()
if (document.getElementById("txtCodigoArticulo").value.trim() == "")
alert("Por favor ingrese el No. de la orden de compra.");

return false;

<asp:Repeater ID="repConceptos" runat="server">
<asp:TextBox ID="txtCodigoArticulo" runat="server" placeholder="Código articulo Min:1 Max:18" MinLength="1" MaxLength="18" OnClientClick="return ValidaComplemento()" CssClass="form-control form-control-sm art" style="background-color:#FBEFEF;" data-toggle="toltip" title="Es el codigo del articulo que CASA LEY tiene" onkeypress="return validarDecimal(event);" AutoComplete="off">

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