Multiple selections

[Chris Boldon]

I'm trying to use a select box, with multiple selections.

I originally had the input types on my form all set to String. With this it would only give me the first item selected from the box. I assumed this was because the tag returns a String[]. When I change the form to accept a String[] it errors out. Can anyone please point me to an example using this, or an explaination. Thank you.

[Merrill Higginson]

String[] is the correct type to use with an <html:select> tag that allows multiple selection. Make sure that both your getter and setter use this type. Also make sure that it is not null. You should declare it something like this:

private String[] mySelect = new String[0];

or else put the following statement in your reset() method:

myselect = new String[0];

If you've tried these suggestions and it still doesn't work, please tell us the error message you're getting and post relevant portions of the jsp and struts-config.xml file.

[Chris Boldon]

When I add a project, via my add form it only adds the first item in the list, not any selected items following. When I use the edit form it resets the field to null, no matter what is selected. Code snippets follow.

Add Form:
-declaration

private String[] projectRisks;

-reset

projectRisks = new String[0];

-getters and setters

 public String[] getProjectRisks() {
return projectRisks;
}
public void setProjectRisks(String[] projectRisks) {
this.projectRisks = projectRisks;
}

Add Action:

newProject.setProjectRisks(utils.arrayToString(addProjectForm.getProjectRisks()));

Edit Form:

public String[] getProjectRisks() {
return utils.stringToArray(project.getProjectRisks());
}
public void setProjectRisks(String projectRisks) {
project.setProjectRisks(projectRisks);
}

Edit Action:

dao.saveProject((ProjectImpl) projectEditForm.getProject());

Value Object (ProjectImpl):

/**
 * @return Returns the projectRisks.
 */
public String getProjectRisks() {
return projectRisks;
}
 
/**
 * @param projectRisks The projectRisks to set.
 */
public void setProjectRisks(String projectRisks) {
this.projectRisks = projectRisks;
}

Utility:

public String arrayToString(String[] array) {
 
int length = array.length;
String converted = "";
for (int i = 0; i < (length - 1); i++) {
converted = converted + array[i] + "|";
}
if (length > 0) {
converted = converted + array[length - 1];
}
return converted;
}
 
public String[] stringToArray(String string) {
if (string != null) {
String tempString = "";
String[] tempArray;
char[] chars = string.toCharArray();
char delim = ("|".charAt(0));
int length = chars.length;
int indexLength = 0;
int index = 0;
for (int i = 0; i < length; i++) {
if (chars[i] == delim) {
indexLength++;
}
}
tempArray = new String[indexLength];
for (int i = 0; i < length; i++) {
if (chars[i] == delim) {
tempArray[index] = tempString;
index++;
tempString = "";
} else {
tempString = tempString + chars[i];
}
}
return tempArray;
} else {
String[] nullArray;
nullArray = new String[0];
return nullArray;
}

[ September 12, 2006: Message edited by: Chris Novindus ]