yeaaaahhhh..hamf hamf yeaaaahhhh..hamf hamf - 1 month ago 10
Java Question

Trouble in populating the combobox using Struts 2

I'm having trouble setting the fields of a

combobox
tag in Struts2 when I'm using the following code in the file

SUCCESS.JSP
:


<s:form>
<s:combobox label="Select and extract a field:" name="fieldname"
headerValue="--- Please Select ---" headerKey="1"
list="fields" listValue="myField" />
</s:form>


On the other hand I can populate the
combobox
using this more direct way, but this is useful for me only for reassuring that the structure of the project is correct:

<s:form>
<s:combobox label="Select and extract a field: " name="fieldsNames"
headerValue="--- Please Select ---"
headerKey="1" list="{'1','2','3','4','5','6'}" />
</s:form>


I'm open to any suggestions, since I've tried so many things and it is obvious that I'm stuck.

The rest of the classes and XML files are:

COMBOBOX.JAVA
:


public class comboboxTag extends ActionSupport{

private List<String> fields;
private String myField;
private String fieldName;

public String getFieldName()
{
return fieldName;
}

public void setFieldName(String fieldName)
{
this.fieldName = fieldName;
}

public String getField()
{
return myField;
}

public void setField(String field)
{
this.myField = field;
}

public String execute()throws Exception
{

fields = new ArrayList<String>();

fields.add("1");
fields.add("2");
fields.add("3");
fields.add("4");
return SUCCESS;

}

public List<String> getFields()
{
return fields;
}

}


STRUTS.XML
:


<struts>

<constant name="struts.multipart.maxSize" value="19000000" />

<package name="fileUploadPackage" extends="struts-default">

<interceptors>
<interceptor-stack name="fileUploadStack">
<interceptor-ref name="exception" />
<interceptor-ref name="alias" />
<interceptor-ref name="servletConfig" />
<interceptor-ref name="prepare" />
<interceptor-ref name="i18n" />
<interceptor-ref name="chain" />
<interceptor-ref name="debugging" />
<interceptor-ref name="profiling" />
<interceptor-ref name="scopedModelDriven" />
<interceptor-ref name="modelDriven" />
<interceptor-ref name="fileUpload">
<param name="maximumSize"> 18900000 </param>
<param name="allowedTypes"> application/pdf,text/plain</param>
</interceptor-ref>
<interceptor-ref name="checkbox" />
<interceptor-ref name="staticParams" />
<interceptor-ref name="actionMappingParams" />
<interceptor-ref name="params">
<param name="excludeParams"> dojo\..*,^struts\..*</param>
</interceptor-ref>
<interceptor-ref name="conversionError" />
<interceptor-ref name="validation">
<param name="excludeMethods"> input,back,cancel,browse</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods"> input,back,cancel,browse</param>
</interceptor-ref>
</interceptor-stack>
</interceptors>

<!-- FILE UPLOAD ACTION -->
<action name="fileUpload" class="org.apache.fileUploadStruts.FileUploadAction">
<interceptor-ref name="fileUploadStack" />
<result name="input">/index.jsp</result>
<result name="success">/success.jsp</result>
</action>

<action name="comboboxTag" class="org.apache.fileUploadStruts.comboboxTag">
<result>/success.jsp</result>
</action>

</package>




INDEX.JSP
:


<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Upload a File!!</title>
<s:head />
</head>
<body>
<s:form action="fileUpload" method="post" enctype="multipart/form-data" >
<s:file name="file" label="User File: " />
<s:submit />
</s:form>
</body>
</html>

Answer

You don't need separate action for combobox. Just create appropriate getter which returns list in your FileUploadAction

public List<String> getFields() {
  List<String> fields = new ArrayList<String>();
  fields.add("1");
  fields.add("2");
  fields.add("3");
  fields.add("4");
  return fields;
}

And don't use listValue, because there is simple strings in your list.

<s:form>
  <s:combobox label="Select and extract a field:" name="fieldname" 
        headerValue="--- Please Select ---" headerKey="1"
        list="fields" />
</s:form>
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