If your character's Animation engine is set to Mecanim, then you can define a "Jump bool" parameter that will be set to True when the character begins a jump.
You can also use this in conjunction a "Is grounded bool", which is set to True whenever the character is on the ground, as well as the "Vertical movement float" parameter, which is set to how quickly a character is moving vertically (and negative if falling).
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You can also use this in conjunction a "Is grounded bool", which is set to True whenever the character is on the ground, as well as the "Vertical movement float" parameter, which is set to how quickly a character is moving vertically (and negative if falling).