I want to make a method call from the jsf and pass parameter to it.

[Shruti B]

Problem: I want to make a method call from the jsf and pass parameter to it.

1. I have a description field which is of 500 characters.
2. I want to show only 37 charcters of the whole description field in the jsf page.
3. So i decided to write a mthod which would convert those 500 characters from the database to the 37 characters but this i dont know how to make the mehtod call and pass the parameter to it.


Please Help

[Rajeev Ravindran]

Did you try calling your method from the getDescription() of ManagedBean/BackingBean, whichever you used to bind to your component.

Thanks,

[g madhava]

3. So i decided to write a mthod which would convert those 500 characters from the database to the 37 characters but this i dont know how to make the mehtod call and pass the parameter to it.

What parameter are you planning to pass ? what method are you planning

I am assuming that you know how JSF handles the method calls using value binding expressions. (for example, in your case it will be #{someBean.description}. This will invoke the getDescription() method of "someBean" managed bean to set the value for that JSF component(In your case, it might be a "textbox" or a "textarea").

some code to get you started.

public class DescriptionManagedBean
    {
        private String descriptionField;
        public DescriptionManagedBean(){}
        public String getDescriptionField()
        {
            // Getting the data from the database.
            // Assuming SomeDao is the Dao class used
            // to interact with the database.
            SomeDao someDao = null;
            descriptionField = someDao.getDescription();
            if (descriptionField != null && descriptionField.length() > 37)
            {
                descriptionField = descriptionField.substring(0,37);
            }
            return descriptionField;
        }
        public void setDescriptionField(String descriptionField)
        {
            this.descriptionField = descriptionField;
        }
    }