Passing a parameter from javascript to managedbean

Question

I have a variable in javascript in jsf page and I want to get this variable in my managed bean. have you any idea how I can do it?

There are certain special ways to do this but if you show the exact scenario lurking in your application, there might be completely different ways to achieve this without using a single JavaScript function at all. — Tiny, Dec 27 '14 at 18:48

score 0 · Accepted Answer · answered Dec 28 '14 at 23:17

This might not be the best solution, but I have done something similar in the past:

In your managed bean (.java) you can access your front end elements by doing:

Map<String, String> parameters = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();

for (Entry<String, String> formElement : parameters.entrySet()) {
        String elementName = formElement.getKey();
        if (elementName != null && //some other qualifier, for instance if the elementName starts with some pre-defined value) {
            String elementValue = formElement.getValue();
            //Set the variable in the backend

        }
}

And in your .js, you can create an element with for the variable you want to access from your managed bean:

formElement = document.createElement('input');
formElement.type = 'hidden';
formElement.name = someName;
formElement.id = someId;
$(document.getElementById('spanId or divId')).append(formElement);

Passing a parameter from javascript to managedbean

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