Array bind

[javiere]

Hi all.
I need to bind a list (SELECT tag) with an array on my command object.
public class MyCommand {
String[] values;
public String[] getValues() {
return this.values;
}

public void setValues(String[] values) {
this.values = values;
}
}


Now, in my JSP, I have a SELECT (list) with add/remove options, but how do I bind all added options to my "values" in my command object?
I want that every item added to the select (every item on my list on html) would be added to "values" on MyCommand instance... Is that possible?

Thanks in advance.

[geggle]

I'm just a little unclear on what exactly you want your select list to do... can you post the JSP code so we can get a better idea of what you have in the UI?

[javiere]

Here is the code:

Command class
public class SomeCommand {
private String[] values;

public String[] getValues() {
...
}
public void getValues(String[] values) {
...
}
}

jsp code:
<form ...>
...
Here I have code to add and remove items in the select below.
...
...
<spring:bind path="command.values">
<select name="values" size="7" multiple="multiple">
<c:forEach var="t" items="${status.value}">
<option value="<c:out value='${t}'/>"><c:out value="${t}"/></option>
</c:forEach>
</select>
</spring:bind>
...
...
<input type="submit" value="Update" onclick="selectAllItems(this.form.tickets);"/>
</form>

The binding is done correctly (as I want to include all items in the select "values", a javascript selects all before submitting the form).
But when the list if empty, the binding doesn't empty the values array on the command. Anyways, I solve it by adding a hidden field with a count of elements... If the count is 0, I MANUALLY clear the array.
So at the moment everything is working fine, but the code sucks.

[geggle]

Hi,

I'm not 100% sure, but I think you are missing a required hidden parameter. It is needed to "fix" the same problem (empty submit) as for checkboxes.

Add the following:
<input type="hidden" name="_${status.expression}" value="1"/>

Alternatively, may I suggest that you look into Spring's <form:*.../> tag library? If you use it, you'd do something like the following:

<form:form commandName="command" ...>
...
<form:select path="values" multiple="true">
<form:options items="${command.values}"/>
</form:select>
</form:form>

Which would automatically add the required hidden input field.

Tony.

[javiere]

Thanks Tony, I'll use the "form:" tags from Spring.