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Dynamics not updating normally in Wolfram Cloud

March 25, 2019   BI News and Info
 Dynamics not updating normally in Wolfram Cloud

In Mathematica, InputFields and Sliders that are connected to Dynamics will change their values if the variable they control is changed procedurally. In Wolfram Cloud, only the first dynamic in a notebook seems to behave this way. In this example,

Grid@{{"a =", InputField[Dynamic[a], Number], 
   Slider[Dynamic[a], {0, 1}]}, {"b =", 
   InputField[Dynamic[b], Number], Slider[Dynamic[b], {0, 1}]}}

a = 0.25;
b = 0.75;
Print["a = ", a, " b = ", b];

The Input fields and Sliders interact properly. But if I then execute this:

a = 0.75;
b = 0.25;
Print["a = ", a, " b = ", b];

The InputField and Slider associated with variable a update to the new value, but the ones for b do not.

Is there something I’m doing wrong? I’m trying to set up a user interface that consists of InputFields that can be changed interactively, but that can also be set to a number of known value sets procedurally. It works as desired in Mathematica.

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