Reference The Forms API Outputting forms as HTML

If you render a bound Form object, the act of rendering will automatically run the form’s validation if it hasn’t already happened, and the HTML output will include the validation errors as a <ul class="errorlist">.

5.2 6.0

Reference The Forms API Outputting forms as HTML

If you render a bound Form object, the act of rendering will automatically run the form’s validation if it hasn’t already happened, and the HTML output will include the validation errors as a <ul class="errorlist"> near the field.

4.2 5.0 5.1

Release notes Django version 0.96 release notes

django.newforms is Django’s new form-handling library. It’s a replacement for django.forms, the old form/manipulator/validation framework.

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Release notes Django version 0.96 release notes What’s new in 0.96?

django.newforms is Django’s new form-handling library. It’s a replacement for django.forms, the old form/manipulator/validation framework.

4.2 5.0 5.1 5.2 6.0

Reference Form and field validation

in tests) that will not vary with translations: Don’t coerce variables into the message; use placeholders and the params argument of the constructor: Use mapping keys instead of positional formatting.

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Reference Form and field validation

… coerce variables into the message; use placeholders and the params argument of the constructor: Use mapping keys instead of positional formatting. This enables putting the variables in any order or omitting them altogether when rewriting the message: Wrap the message …

4.2 5.0 5.1 5.2 6.0

Reference Django Exceptions Django Core Exceptions

exceptionValidationError[source] : The ValidationError exception is raised when data fails form or model field validation. For more information about validation, see Form and Field Validation, Model Field Validation and the Validator Reference.

4.2 5.0 5.1 5.2 6.0

Reference Django exceptions

exceptionValidationError[source] : The ValidationError exception is raised when data fails form or model field validation. For more information about validation, see Form and Field Validation, Model Field Validation and the Validator Reference.

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Reference Form and field validation

The previous sections explained how validation works in general for forms.

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Reference Form and field validation

The previous sections explained how validation works in general for forms.

4.2 5.0 5.1 5.2 6.0

Reference Form and field validation

If you detect multiple errors during a cleaning method and wish to signal all of them to the form submitter, it is possible to pass a list of errors to the ValidationError constructor.

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Reference Form and field validation

Django’s form (and model) fields support use of utility functions and classes known as validators.

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Reference Form and field validation

Let’s first create a custom form field that validates its input is a string containing comma-separated email addresses.

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Reference Form and field validation

Continuing on from the previous example, suppose that in our ContactForm, we want to make sure that the recipients field only contains addresses that are @example.com.

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Reference Form and field validation

Suppose we add another requirement to our contact form: if the urgent field is True, the subject must contain "help".

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Reference Form and field validation Raising ValidationError

If you detect multiple errors during a cleaning method and wish to signal all of them to the form submitter, it is possible to pass a list of errors to the ValidationError constructor.

4.2 5.0 5.1 5.2 6.0

Reference Form and field validation Using validation in practice

Django’s form (and model) fields support use of utility functions and classes known as validators.

4.2 5.0 5.1 5.2 6.0

Reference Form and field validation Using validation in practice

Let’s first create a custom form field that validates its input is a string containing comma-separated email addresses.

4.2 5.0 5.1 5.2 6.0

Reference Form and field validation Using validation in practice

Continuing on from the previous example, suppose that in our ContactForm, we want to make sure that the recipients field only contains addresses that are @example.com.

4.2 5.0 5.1 5.2 6.0

Reference Form and field validation Using validation in practice

Suppose we add another requirement to our contact form: if the urgent field is True, the subject must contain "help".

4.2 5.0 5.1 5.2 6.0