# Input in Manipulate

Plot[Evaluate[
Input["Please input a function of x to plot with one parameter \
\[Alpha] to manipulate"]], {x, 0, 1}]


This work without doubt. But this not

Manipulate[
Plot[Evaluate[
Input["Please input a function of x to plot with one parameter \
\[Alpha] to manipulate"]], {x, 0, 1}], {\[Alpha], 0, 1}]


1) Is there a way to make it work. 2) I have no experience of cdf. But, if ever there is a way to make it work could it works in cdf ?

There is no reason to keep your Input inside of Manipulate, you don't want a dialog show up every time it updates, right? Probably you need something like this:

ClearAll[f, x, \[Alpha]]
f[x_, \[Alpha]_] =
Input["Please input a function of x to plot with one parameter \
\[Alpha] to manipulate"];
Manipulate[Plot[f[x, \[Alpha]], {x, 0, 1}], {\[Alpha], 0, 1}]


You can also take advantage of built-in math expression interpreter and enter functions in a more familiar way, like "sin(alpha pi / x)" for example:

f[x_, \[Alpha]_] =
Interpreter["MathExpression"][
InputString[
"Please input a function of x to plot with one parameter \[Alpha] \
to manipulate"]]