Restrict Users from entering only spaces in textbox in c# mvc

Question

I have a view where in textbox user enters a value. It may be number, character, special character anything. But I want to validate that user is not allowed to enter ONLY spaces. User can enter spaces with characters, but ONLY spaces are not allowed.

For eg.

User can enter Name : Stack ""space" Overflow

but user should not be allowed to enter

Name : "space" "space" "space"

Problem is I cant check it server side as my models are DTO defined in another project which is loaded as dll in this one.

Then do it correctly and use a view model and add the [Required] attribute to the property of your view model. — user3559349
– user3559349, Commented May 12, 2015 at 12:33
RequiredAttribute works well, as a validation exception is raised if the property is null, contains an empty string (""), or contains only white-space characters. — BabyDuck
– BabyDuck, Commented May 12, 2015 at 12:34
@Stephen : My model is in dll, and it does not validate from dll. — Pranav
– Pranav, Commented May 12, 2015 at 12:40
It does not matter where your data model is. Use a view model. Every view especially when editing should have a view model - What is ViewModel in MVC? — user3559349
– user3559349, Commented May 12, 2015 at 12:41

phooey · Accepted Answer · 2015-05-12 12:28:18Z

1

Could you not trim the text and check if the length is greater than zero?

answered May 12, 2015 at 12:28

phooey

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1 Comment

Pranav Over a year ago

No.. I have model which sends value to the dll file via object. In this I cant edit each and every value and set again to the object of the model.

Rahul Tripathi · Accepted Answer · 2015-05-12 12:30:30Z

1

You can try this

bool b= textBox1.Text.Length>0 && textBox1.Text.Trim().Length==0;

answered May 12, 2015 at 12:30

Rahul Tripathi

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Comments

Community · Accepted Answer · 2017-05-23 12:14:16Z

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Define a trim function in Javascript. More information can be found here: Trim string in JavaScript?

edited May 23, 2017 at 12:14

CommunityBot

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answered May 12, 2015 at 12:32

Mohammad M. Ramezanpour

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2 Comments

Pranav Over a year ago

I cant do that. As if I want to enter a value "Stack Overflow" the space in between stack and overflow will be replaced. Also I have already one javascript running that validates if the box is empty.

Mohammad M. Ramezanpour Over a year ago

if(string.trim(yourTextBox.text) ==! "") { //Send data to server }

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