how to get jsf clientid of a component in datatable?
clientid, components, datatable, jsf
Solution
however this returns `mappedidentifier_table:mappedidentifier_Update` instead of `mappedidentifier_table:1:mappedidentifier_Update`
This will happen if you resolve the `clientId` outside the context of a row. The row context is set up at each stage of the lifecycle by the `UIData` control.
It might also happen if you're using immediate evaluation instead of deferred evaluation in your EL expressions - `${}` instead of `#{}`.
As an aside, and as noted in the article, that lookup algorithm will only work if the component identifier is unique to the view; the spec says it need only be unique to the `NamingContainer`; this need not be a problem if you are careful about using unique component IDs on your page.
Problem
i am trying to get the client id of a component in a datatable. the problem is that jsf puts row index before the component id automatically, i.e. ``` <a id="mappedidentifier_table:1:mappedidentifier_Update" href="#">Update</a> ``` for a link in the second row (index=1). i am using the following methods to get the clientId ``` public static String findClientId(String id) { FacesContext context = FacesContext.getCurrentInstance(); UIViewRoot view = context.getViewRoot(); if (view == null) { throw new IllegalStateException("view == null"); } UIComponent component = findComponent(view, id); if (component == null) { throw new IllegalStateException("no component has id='" + id + "'"); } return component.getClientId(context); } private static UIComponent findComponent(UIComponent component, String id) { if (id.equals(component.getId())) { return component; } Iterator<UIComponent> kids = component.getFacetsAndChildren(); while (kids.hasNext()) { UIComponent kid = kids.next(); UIComponent found = findComponent(kid, id); if (found != null) { return found; } } return null; } ``` however this returns `mappedidentifier_table:mappedidentifier_Update`, instead of `mappedidentifier_table:1:mappedidentifier_Update`, therefore it does not match any element cause the row index in id is missing. i've read http://illegalargumentexception.blogspot.com/2009/05/jsf-using-component-ids-in-data-table.html however i intend to have a simpler implementation, rather than TLD function or facelets like the author did. does anyone have any thoughts ? thanks, dzh