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This UI is for a B2B web ecommerce page, where a buyer can enter quantities for multiple sizes of a product. They first click a size in the top row which reveals up/down arrows on the qty, which the user than taps to increase or decrease qty as needed.

tab Size Quantity

on the click: up and down arrows to change the quantity of the Size 6

enter image description here

Can you suggest any alternative or new UI that save space but is scalable and is suitable for mobile gestures?

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What is the use case for this interface? – cimmanon Nov 28 '13 at 18:37
To be placed in a Product Page in a B2B Ecommerce website. 1 Buyer "Searches for products" 2 Selects "Quantity" for each "Size" 3 Click "Add to order" to Add the selection to the current order – Timo Patek Nov 28 '13 at 18:51

Current design has some bad features:

  • Per-column layout isn't scalable, as the screen width is limited. And horisontal swipe for scrolling could conflict with screen changing gesture interaction.
  • Per-column interaction isn't convenient, as the data is best readed row by row.
  • Increase and decrease buttons rather small for touch interaction. enter image description here

You could use more convenient layout, which has no mentioned issues:
enter image description here

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Thank you so much for the feedback. I totally agree with both your point, the only thing is that I am trying to stay as short as possible in terms of verticality and 4/5 might be the average number of rows in this feature. – Timo Patek Nov 28 '13 at 19:03
@fdonelli Ignoring usability saves the screen space but cuts the money. That's why usability is important. – Alexey Kolchenko Nov 28 '13 at 19:37
Of course. Thank you for your suggestion anyway, I am reworking on that anyhow. – Timo Patek Nov 28 '13 at 19:47
The version of @Alexy supports the mental model of users better. – sysscore Nov 29 '13 at 16:14

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