I am looking for a way to create a masktextbox with a custom mask to allow only numbers and decimals. There can only be 2 decimal places & only one decimal point in place. Can this be done from a custom mask. I read the MSDN Doc related to mask but it doesn't seem to allow much flexibility or may be I am missing something, any details in this regard will be helpful.
Input for the mask textbox can be any number followed by 2 decimals (Optional).
Eg. 1200 or 1200.25 or 10
Related
I made a blog that shows it current with and height in the displayed thext.
Now they have 4 decimal places (for example 5.600), see picture below.
I want them displayed with only 1 decimal place, how can i do this?
(example below would become 5.6x16.5 in stead of 5.6000x16.5000)
You can either modify the Precision property of the Field formatting so as to round the result to 1 decimal place:
Or, if you were looking to retain the precision, you could instead suppress trailing zeroes within the Additional Format options:
Alternatively, assuming that your formatting is set to Current units, you could change the value of your LUPREC system variable.
I am working on some legacy code at the moment and have come across the following:
FooString = String.Format("{0:####0.000000}", FooDouble)
My question is, is the format string here, ####0.000000 any different from simply 0.000000?
I'm trying to generalize the return type of the function that sets FooDouble and so checking to make sure I don't break existing functionality hence trying to work out what the # add to it here.
I've run a couple tests in a toy program and couldn't see how the result was any different but maybe there's something I'm missing?
From MSDN
The "#" custom format specifier serves as a digit-placeholder symbol.
If the value that is being formatted has a digit in the position where
the "#" symbol appears in the format string, that digit is copied to
the result string. Otherwise, nothing is stored in that position in
the result string.
Note that this specifier never displays a zero that
is not a significant digit, even if zero is the only digit in the
string. It will display zero only if it is a significant digit in the
number that is being displayed.
Because you use one 0 before decimal separator 0.0 - both formats should return same result.
Based on Apple's documentation here: https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Strings/Articles/FormatStrings.html
It's pretty easy to understand the number to the right of the decimal point is the number of digis will be rounded up...
For example, %1.2f, 123456.123456 will turn out 123456.12 and %1.4f will turn out 123456.1234...
But it looks like the number to the left of decimal does nothing.
I tried changing the number to whatever I can think of, nothing happened.
What does it do?
The number before the decimal point in the format is called the format string's width. That is, if the resultant string would involves less characters than its width, it will be left-padded with blank spaces. You don't see any change because you either aren't using a high enough number (try something ridiculous like 100 or 200), or don't have a means of properly seeing your whitespace.
Problem
I need to format an input field visually in order to help the user know what they should type as a phone number. For example, I want to accept a phone number as being a 3 digit area code, 3 digit prefix and 4 digit suffix: (207) 555-1212. I want to:
provide the helper formatting to the input field -- those parentheses and the hyphen
I don't want the 'helper' characters to be included in the actual data I store in my model.
As the user types, I want the parentheses to magically appear, then have the hyphen also appear at the right point.
What's the best way to do it?
Note: This is not for displaying of a number -- I could use a filter for that. This is for formatting data within an input field.
Thanks for your help!
If you are looking for a simple solution, you could give AngularUI a try, http://angular-ui.github.com/
This is the example from the "Mask" section of that page:
<input ng-model="maskDemo" ui-mask="'99-99-9999'">
The "9"'s are numbers, and other stuff is just a mask / placeholders. It should only submit the actual values. You would edit the mask to include parentheses and anything else you may need.
Can any one please help me how to get float value as it is from text box
for Ex: I have entered 40.7
rateField=[[rateField text] floatValue];
I am getting rateField value as 40.7000008 but I want 40.7 only.
please help me.
thanks in advance
Thanks Every body,
I tried all the possibilities but I am not able to get what I want. I am not looking to print the value to convert into string.I want to use that value for computation. If i use Number Formatter again when i am converting from number to float it is giving same problem.So i want float value only but it should be whatever i have given in the text box it should not be padded with any values.This is my requirement.Please help me.
thanks®ards Balu
Thanks Every body,
I tried all the possibilities but I am not able to get what I want. I am not looking to print the value to convert into string.I want to use that value for computation. If i use Number Formatter again when i am converting from number to float it is giving same problem.So i want float value only but it should be whatever i have given in the text box it should not be padded with any values.This is my requirement.Please help me.
thanks®ards
Balu
This is ok. There is not guaranteed that you will get 40.7 if you will use even double.
If you want to output 40.7 you can use %.1f or NSNumberFormatter
Try using a double instead. Usually solves that issue. Has to do with the storage precision.
double dbl = [rateField.text doubleValue];
When using floating point numbers, these things can happen because of the way the numbers are stored in binary format in the computers memory.
It's similar to the way 1/3 = 0.33333333333333... in decimal numbers.
The best way to deal with this is to use number formatters in the textbox that displays the value.
You are already resolved float value.
Floating point numbers have limited precision. Although it depends on
the system, float relative error due to rounding will be around 1.1e-8
Non elementary arithmetic operations may give larger errors, and, of
course, error progragation must be considered when several operations
are compounded.
Additionally, rational numbers that are exactly representable as
floating point numbers in base 10, like 0.1 or 0.7, do not have an
exact representation as floating point numbers in base 2, which is
used internally, no matter the size of the mantissa. Hence, they
cannot be converted into their internal binary counterparts without a
small loss of precision. This can lead to confusing results: for
example, floor((0.1+0.7)*10) will usually return 7 instead of the
expected 8, since the internal representation will be something like
7.9999999999999991118....
So if you're using those numbers for output, you should use some rounding mechanism, even for double values.