2016年12月2日 · The required attribute does not take the attribute value. It's just required="true", or required="required", or just setting the <input type="text" required />

2022年2月22日 · then my_field is required, with * next to it in the form and you can't submit the empty value. If you use blank=True. my_field = models.PositiveIntegerField(blank=True) then my_field is not required, there won't be a * next to it in the form and you can't submit the value. But it will get null field not allowed.

2012年5月23日 · I'm not sure this is the right approach but I think you can extend the concept and can create a more generic / reusable approach. In ASP.NET MVC the validation happens at the binding stage. When you are posting a form to the server the DefaultModelBinder is the one that creates model instances from the request information and add the validation ...

2019年9月14日 · My page is validating a field that is not required when I submit, even though there is no validation configured for this field. Create.cshtml @model Lawtech.App.ViewModels.ProcessoViewModel @{

2020年12月3日 · So, to wrap up my question. I want my URL and email fields to be optional not required :) EDIT. Since there are some answers and no one work for me I just want to mention (if it does do anything with it), all of my validation rules are in a separate request...

2016年7月14日 · Parameters can be required or optional depending on how they appear in the function definition: def myfunction(p1, p2, p3=False, p4=5) In this definition, parameters p1 and p2 are required. p3 is optional and will acquire the value False if not provided by the caller. p4 is also optional and will acquire the value 5 if not provided.

The built-in DefaultModelBinder in MVC will perform required and data type validation on value types like int, DateTime, decimal, etc. This will happen even if you don't explicitly specify validation using someting like [Required] .

2012年2月28日 · So obviously, when I create a Product, I can select a category for that product. Or rather, a category is required. I can't create a product without explicitly selecting a category, and my data is structured in such a way, that I don't want to …

2020年11月14日 · I have this model for an app that tracks our migration status for users. If they haven't been migrated, there's no migration date. So, how can they leave that field blank? It's not annotated as required, yet validation fails as if it is required. I cannot seem to set it to null either. How does one get around this problem?

In HTML, the required attribute must be present (the field is required) or absent (the field is NOT required). When the attribute is present, it does not matter what value it has. The required attribute is a boolean attribute. When specified, the element is required.