we had topic about it which was discussed before here
https://defence.pk/pdf/threads/hindu-shahi-kings-were-not-janjua-rajputs-of-punjab.518367/page-2
Hindu Shahi dynasty had been established by Kallar the Brahmin but later, in 964 AD, Raja Jyapala Janjua wrestled it from the descendants of Kallar. Sabaktagin, with the help of his Khalj and Afghan armies, defeated Jyapala at some point in Laghman driving him out of Kabul Valley and decisive battle between Mahmud and Jayapala occured somewhere near Peshawar.
Famed ethnologists and Indo researchers Sir Alexander Cunningham, Elliot and Dowson and Sachau led research into the origins of the Pala Hindu Shahi, the second dynasty that succeeded the initial Brahmin Dev Shahi. Through independent research they concluded that the origins of Emperor Jayapala Shah was in fact in the Janjua Rajput. In 1973's Al-Biruni International Congress in Pakistan, Dr Hussain Khan presented a paper in called "An Interpretation of Al-Biruni's Account of the Hindu Shahiyas of Kabul" which also confirmed the same findings. Finally, the Janjuas own genealogy records the names of the Janjua Shahi Jayapala as well as the continued descendants of his House. There are plenty of forts i.e Nandana, malot fort in salt range region of Punjab built by the successor of Hindu shahi king Jayapala Janjua
Read this book
and also these links for useful information
https://historypak.com/hindu-shahi-dynasty/
http://indiancoinsgks.blogspot.co.uk/2014/12/brief-history-of-kabul-shahi-dynasty.html
http://malicethoughts.blogspot.co.uk/2016/07/raja-jayapala-and-janjua-rajput-dynasty.html