jsp中设置必填项

<td>

<input id="Province"
required="false" name="Province" width="320px"class="wsd-combobox" win_seltype="1" label="工程所在省" entityname="Province" textName = "udf2"/>

</td>

<td>

<input id="City"
required="true" name="City" width="320px"class="wsd-combobox" win_seltype="1" label="工程所在市" entityname="City" textName = "udf2" />

</td>

required 的值为“true” 则此字段为必填项，当为“false”时则为选填项。