# Video (Prevent forwarding)

**URL:** <https://cl.desmos.com/t/video-prevent-forwarding/3835>\
**Category:** Questions\
**Created:** [November 15, 2021, 5:23pm UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835 "2021-11-15T17:23:56Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Shayne\_Stedman](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/shayne_stedman/32/416_2.png) [@Shayne\_Stedman](https://cl.desmos.com/u/Shayne_Stedman)\
**Post date:** [November 15, 2021, 5:23pm UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835/1 "2021-11-15T17:23:56Z")

</div>

I am attempting to create slides for students to watch videos and complete a check for understanding example all while preventing students from forwarding. I have tried to use the sink time: this.time and it continues to fail and prevents the video from playing. Wondering why this.time does not work. I wanted to say something like

```auto
time: when this.time > button.timeSincePress(999) 0 otherwise this.time    

```

The only work around for me is this slide. Does anyone have any other better ideas?

> **[Prevent Forwarding • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/618ec5b8ba5edb7051f69ace)**
>
> by Shayne Stedman

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**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [November 15, 2021, 5:34pm UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835/2 "2021-11-15T17:34:09Z")

</div>

Not sure. I think because it’s a circular dependency, which doesn’t fly in Desmos.

I thought about doing something like this, but instead have your CFU question (with instructions to pause) pop up during the video during a certain time window. You could then limit moving forward based on whether the student answered the question or not.

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<div class="post-metadata">

**Author:** ![Shayne\_Stedman](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/shayne_stedman/32/416_2.png) [@Shayne\_Stedman](https://cl.desmos.com/u/Shayne_Stedman)\
**Post date:** [November 15, 2021, 5:49pm UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835/3 "2021-11-15T17:49:40Z")

</div>

Interesting, anytime I have a time: when this.time = 10 otherwise ??? I’m unsure of what to type after otherwise to make no change? Advice?

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [November 15, 2021, 6:20pm UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835/4 "2021-11-15T18:20:13Z")

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That’s what I’m saying. I don’t know that it will ever work (maybe it does) because it’s setting the time based on the time, which is circular.

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<div class="post-metadata">

**Author:** ![Shayne\_Stedman](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/shayne_stedman/32/416_2.png) [@Shayne\_Stedman](https://cl.desmos.com/u/Shayne_Stedman)\
**Post date:** [November 15, 2021, 11:46pm UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835/5 "2021-11-15T23:46:34Z")

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@Daniel_Grubbs  
This seems to be working great for me. You probably have something better but it prevents fast forwarding and includes a cfu at any designated time. [Properties of Logarithms • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/6192ad8281f1e46621cec75a)

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<div class="post-metadata">

**Author:** ![mrkleing](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/mrkleing/32/1108_2.png) [@mrkleing](https://cl.desmos.com/u/mrkleing)\
**Post date:** [December 8, 2022, 5:14am UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835/6 "2022-12-08T05:14:20Z")

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I tried this activity and it seemed like I could just advance to the next slide return to previous slide and then I could skip through the video.

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<div class="post-metadata">

**Author:** ![Shayne\_Stedman](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/shayne_stedman/32/416_2.png) [@Shayne\_Stedman](https://cl.desmos.com/u/Shayne_Stedman)\
**Post date:** [December 8, 2022, 9:36pm UTC](https://cl.desmos.com/t/video-prevent-forwarding/3835/7 "2022-12-08T21:36:48Z")

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I think I fixed it? I had to “reset” the buttons when navigating from the slide. Try it out. Took me a long time to make this one…🙂