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There is a website similar to reddit where users can write messages, and vote them.

Due technical reasons, when a user votes a message, their vote cannot be undone.

The problem is that in mobile version, sometimes the users misses the button and vote down when they wanted to vote up.

Now I found two options:

  • Separate more the buttons "vote up" and "vote down"
  • Add a confirm message where vote down saying something like "Are you sure that you want to vote down?

Which is more usable?

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3 Answers 3

up vote 9 down vote accepted

Something you could apply is a slide control, similar to that of answering a call or locking up the screen. If you use the entire width of the screen for the control the amount of unintentional votes could be kept to a minimum, and the action is performed in one operation/gesture.

mockup

download bmml source – Wireframes created with Balsamiq Mockups

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+ I like this. If activating a small indicator on screen invoked a full screen overlay with the full screen control, that would be slick. Of course, a cancel button might be helpful, but certainly not necessary if the device's built in back button was adequate and available. –  JustinC Jun 5 '13 at 1:36
    
@JustinC Thanks for the feedback! I believe the OP was looking for a solution that could be integrated into the feed of content, without being arranged in an additional view (overlay/popup/modal). In a list view that utilize the entire viewport width you could use this control at full width without having it in another expandable window. –  AndroidHustle Jun 5 '13 at 10:55
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In most cases, less steps are better, so I would go for the first option.

The next problem is how would you effectively present the separation to the user. The separation should be presented in a manner relatively close to its desktop-version. The intent is you want your user to still feel that the mobile version, is really the mobile version and will not go finding where the other "Vote"-button is.

If you could provide a mock-up or screenshots that would benefit this discussion.

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Due to technical reasons, when a user votes a message, their vote cannot be undone.

Clearly, allowing a vote to be undone is optimal from the user's point of view. It seems that technical decisions are inappropriately driving the functionality of the program. If it is under your control, why not fix the underlying problem, instead of spending your time on a work-around that won't really be satisfactory?

Allowing a user to come back and change a vote at any time may be quite disruptive to your design. However, all that is really needed here is the ability to change the vote for a short period of time (10 or 15 seconds). I suggest implementing a short pause before the vote is officially recorded, and allowing the vote to be changed during that time.

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Maybe they use a third party solution and only have an interface to work with which doesn't allow reroll of votes. I don't know, but that could be the case –  AndroidHustle Jun 4 '13 at 14:28
    
@AndroidHustle, fair enough. I added qualification to the answer. –  dan1111 Jun 4 '13 at 14:30
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