we are creating a Latex Online Editor Compiler, The compiler Part and the Viewer part etc are over, but one problem i can't able to solve, In sharelatex, if we click the Pdf Viewer inside some Text, it will redirect the cursor to the Textbox containing Tex document, Can anyone help me in educating the logic behind that functionality in Sharelatex
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synctex, see e.g. What exactly is SyncTeX?, though exactly how it is implemented I have no idea. You could look at their code though: https://github.com/sharelatex/sharelatex – Torbjørn T. Jan 22 '16 at 06:43