drop down list in jsp page

In the process of WEB development, we often encounter functional requirements for information modification. At this time, we provide the user with a JSP page that displays the current information and allows the user to reset the new value.

In this page, a drop-down list is generally indispensable. As for its processing method, I have thought of one before, and the idea is as follows: set a hidden field on the page to save the value passed from the background; then output the drop-down list on the page, and its value is the default at this time, that is, the first One item; get the value in the hidden field in the js code snippet and determine whether it is equal to the id value of the drop-down item in the loop. If equal, set the selected status of the item. Because this method is too cumbersome.

The following are two commonly used processing methods.

Method one:

<select id="user_id" name="user_id">
   	<c:forEach items="${users}" var="u">
   	<option value="${u.id }" <c:if test="${user.user_id==u.id}"><c:out value="selected"/></c:if>>
   	${u.name}
   	</option>
   	</c:forEach>
</select>

Method two:

<select id="projectPorperty" name="projectPorperty">
   	<option value="1">实施</option>
   	<option value="0">研发</option>
</select>
<script>
   	form.projectPorperty.value = '${user.projectPorperty}';
</script>

The above two methods have their own advantages and disadvantages. Choose as appropriate according to the situation!

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