I want to create a link with read more text. if there are more than 3 lines in a paragraph this link should be visible and clicking on this it show display all the lines. >
I wanted to do the same thing, so I created a directive. Have a look here: https://gist.github.com/doukasd/0744566c5494ebc8643f
Usage is pretty simple:
{{veryLongText}}
Where 100 is the character limit you want to specify.
UPDATE: dd-text-collapse