# Multiple tabs in one file **URL:** \ **Category:** Dash Python\ **Created:** [April 28, 2019, 9:29pm UTC](https://community.plotly.com/t/multiple-tabs-in-one-file/22841 "2019-04-28T21:29:52Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Tedsea](https://avatars.discourse-cdn.com/v4/letter/t/f9ae1b/32.png) [@Tedsea](https://community.plotly.com/u/Tedsea)\ **Post date:** [April 28, 2019, 9:29pm UTC](https://community.plotly.com/t/multiple-tabs-in-one-file/22841/1 "2019-04-28T21:29:52Z")
Hello, I am trying to have a multiple tab set up with dash in the same file . Basically so that I dont re-run some calculations. What happens is that when I run my dash script at first It works perfectly. Once I go to the second tab and I try to go back to the first one, the data is not loading. The tab picker call back output is an input of the second layout but I cant manage to add it as an input for the first layout. I am thinking of a solution but I am not very familiar with dash: 1- Is there a way a callback can be skipped if it doesnt find an input or output ID ? Hence when the layout 2 is not activated only the callbacks related to the layout 1 is activated? 2- Can I explicitely ask for a callback to be fired when another callback A or B is fired depending on a certain condition? I am basically having/ layout1 = … layout2= … MainLayout=… @app.callback… to choose the tab @app.callback… related to tab1 @app.callback… related to tab2 the inputs and outputs of each tab specific callback only exist in either tab1 or tab2 Basically I am not separating the callbacks in different files to use the same object intiated in tab1 callback… Can someone help me with this one please?