One-Click-Root Failed On Samsung J7 SM-J700H
One click root methods seem not to work on Samsung devices running Android Lollipop and above. They use an exploit that is already patched by either Samsung or Google. 

So, the best method still the  Chainfire's CF-Autoroot. I root mobile devices daily and this method seems to work on every Samsung devices. The method consists of flashing a modified recovery by entering the device in Download mode, no ADB here but OEM unlock should be required.


Download this file
Download Odin flasher
Open Odin, click on AP/PDA and select the file you have downloaded. 
Boot the phone in download mode (volume down + power button the volume up to confirm)
Click on Start and wait. 


The developer has rooting files for  almost all Samsung devices from his site.