fields to retrieve {data:text1} does not work how to do it

i need to retrevie fileld name as variable
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example
.......tables&act=chart&table_name=os5pk_chronoforms_data_fffff&field=text1
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here i can take field name as a variable
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with this i want to serach things with dropdown selection
lets say
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marketing has 1 to 4 values
accounting has 1 to 4 values
wheen i select marketing from dropdown i can list only marketing course
so marketing column to retreive in database

In your case it would be {data:field}

Field name is text1
{data:text1} gives error when put fields to retriew

.......tables&act=chart&table_name=os5pk_chronoforms_data_fffff&field=text1

In THAT case that you posted, to get the value of "field" you would use {data:field}

no this is an example i saw on chronoforms when you click chart icon on tables
it show istatistics based on selected field name
i mean it looks like doable
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i just want to know how to do this

In WHERE conditions:

databasefieldname:{data:formfieldname}/-

NOT in "fields to retrieve".
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The /- at the end means "if formfieldname doesn't exist, ignore the condition and move on"

in your way it returns values of text1

But this is not what i want
i want this
lets say text1 is a dropdown inside value a and b
table
a b
4 5
2 4
2 5
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select {data:text1}, count({data:text1} from table x group by {data:text1}
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i mean i want field name as variable not the value
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if user select a group a column
if user select b group b column

Sorry don't think it works that way. Just retrieve all the fields the performance hit is negligible.
To pick a particular field out of the returned array you'll need to use PHP, something along the lines of (for "return first matching")

$this->get("read_data#.model." . $this->data("field"))