Notice that '#cboProveedor' is a combobox object, you need to call 'getValue' method to get its value.

Code:

var cboProv=$("#cboProveedor").combobox('getValue');

Thank you, I appreciate your attention

I have a combo, I want to pass the id to the grid, I find the way to do

my code PHP/HTML:

Code:

<?php 
  include 'conn.php';
 $consulta="SELECT cve_prov, nombre_prov FROM tproveedores"; 
 $result= mysql_query ($consulta)
?>
  <select name="cboProv" id="cboProveedor" class="easyui-combobox" required="true">
    <option value="">Seleccione...</option>
     <?php
         while ($fila= mysql_fetch_array($result)){
               echo "<option value='".$fila['0']."'>".$fila['1']."</option>";
	       echo $fila['0'];
              } 
    ?>

Code Javascript

Code:

   function agregar(){
          // declare variables to bring me the form data
	    var nombre=$("#nombre_art").val();  //this value has a good time
   	    var precio=$("#precio_art").val();    //this value has a good time
	    var cboProv=$("#cboProveedor").val();  //this value does not pass

	       	var row = $('#dg').datagrid('getSelected');
			if (row){
				var index = $('#dg').datagrid('getRowIndex', row);
			} else {
				index = 0;
			}
			$('#dg').datagrid('insertRow', {
				index: index,
				row:{
				    nombre_art_prov: nombre, 
				    precio_art_prov: precio,
				    fk_cve_proveedor: cboProv
					}
			});
			$('#dg').datagrid('selectRow',index);
			$('#dg').datagrid('beginEdit',index);
		}

image of the grid

excuse my English writing, I try to let me know .. thank you

Daniel