<label for="email">Project Name</label>
<select name='project_name' class='required input_field' id='project_name'>
<option value=''>-- Select --</option>
<c:forEach var="row" items="${result.rows}">
<option value="${row.ProjectId}">${row.ProjectName}</option>
</c:forEach>
</select>

<label for="author">Client Name</label>
<input type='text' name='client_name' id='client_name' class='required input_field' style='width:260px;'>

this.form['client_name'].value = this[this.selectedIndex].innerText