“Trolls” is pure delight, lots of jokes, great music, and a surprisingly wise take on the elusive quest for happiness. Plus, it has that Justin Timberlake song that’s like pure sunshine.

It is tricky to make self-consciously adorable characters happy without being sugary, but it works because they understand the difference between happiness based on generosity, honesty, and courage and pleasure, based on sensation.

The characters are inspired by the so-ugly-they’re-cute troll dolls with the colorful poufs of hair invented by Danish sculptor Thomas Dam (DreamWorks has now bought the company, making the film something of an infomercial for the toys). The trolls all about sunshine, parties, singing, dancing, cupcakes, glitter, scrapbooks, and scrapbooks frosted with glitter. They have fitbit-style wrist bands reminding them every half hour that it is hugging time. The trolls are led by benevolent King Peppy (Jeffrey Tambor), who saved the trolls from the monstrous Bergens twenty years before, and his irrepressibly cheery daughter Princess Poppy (Anna Kendrick).

The Bergens are as naturally unhappy as the trolls are happy. The only way the Bergens have ever found to feel happy is to eat the trolls. Once a year, they would raid the troll tree and gobble down as many as they could. King Peppy led them to a secret place where the Bergens could not find them, courageously risking his own life to make sure there was “no troll left behind.”

Poppy decides to have a party to celebrate 20 happy and peaceful years since the trolls escaped from the Bergens. Branch (Justin Timberlake), the one pessimistic troll, warns her that a loud celebration might attract the attention of the Bergens, but Poppy insists. Branch is right — the Bergen chef (Christine Baranski) has been searching for the trolls for 20 years, and the party fireworks lead her to their new home. She captures some of the trolls and Poppy, mindful of her father’s example, goes off to rescue them.  Branch, who had predicted the Bergen threat and spent all his time creating a shelter while the other trolls were hugging and singing, had planned to wait out the invasion alone. But Poppy invites the other trolls to hide out there, and Branch agrees to go with her.

And so there is a journey and (literally) colorful characters along the way and once in Bergen-land, where the rescue effort is complicated but ultimately aided by the trolls friendship with a Bergen scullery-maid with a crush on the young king. Her name is Bridget (Zooey Deschanel) and she agrees to help the trolls if they will help her get the attention of the king.  There’s a makeover that is half mice in “Cinderella” and half Cyrano de Bergerac. I worried that the film was buying into old-school notions that a girl has to be made over to attract and please a man, but the film is clear that Bridget that she may get a confidence boost from the makeover but she needs to be honest with her crush about who and what she is.  And it was very good to see the movie’s honest engagement with the idea of happiness.  Even with daunting and scary challenges, a positive attitude can inspire you and those around you. Even the saddest loss does not mean that you lose happiness forever.  And the greatest happiness comes from being close to those we love.  Hugs and music and dancing always help, too.

Parents should know that this film includes fantasy/action peril. Some trolls are eaten by the Bergens, with one especially sad loss of a character’s grandmother.

Family discussion: What do the trolls know about happiness that the Bergens don’t?  What is the difference between pleasure and happiness? What is the hardest part of trying to be happy?

If you like this, try: “Megamind” and “Despicable Me”