Strut: Multi-select Checkbox in form

When creating a form, using checkbox to capture user's input is common. So how do we check whether the checkbox is checked when the user submit the form?

Javascript:

// Flag to check whether any checkbox is checked.
var checkB = false;

// Get the form object in the page.
var checkboxLength = document.forms[0];

//Loop through the form elements.
for (var i=0; i<checkboxLength.length; i++)
  {
        if(checkboxLength.elements[i].checked == true){
      checkB = true;
        }  
  }

Struts: Nested

Include in JSP:

<%@ taglib prefix="nested" uri="http://struts.apache.org/tags-nested" %>

Define bean:

            request.setAttribute("schoolList", schoolList);

Iterate over arraylist:

<nested:select property="school">
<html:options collection="schoolList" property="id" labelProperty="name" />
</nested:select>
</nested:nest>

Struts html select tag

To default a selection:
<html:select name="defaultValue" property="value">
<html:optionsCollection name="myKey" value="value" label="label"/>
</html:select>"
Replace select "name" and "value" with the names and values of the HTML struts. You have now selected default HTML struts.