It is described in the Viṣṇu Purāṇa that when Akrūra came to take Kṛṣṇa and Balarāma to Mathurā, just by seeing Their faces he became so cheerful that all over his body there were symptoms of ecstatic love. This state is called happiness.
It is stated in the Tenth Canto, Thirty-third Chapter, verse 11, of Śrīmad-Bhāgavatam, "Upon seeing that Kṛṣṇa's arm was placed on her shoulder, one of the gopīs engaged in the rāsa dance became so ecstatically happy that she kissed Kṛṣṇa on His cheek." This is an instance of feeling happiness because of achieving a desired goal.