5362614c3e
Introduces Field, Rule, ValidateAll, ResetFields, and AddError for declarative input validation. Includes built-in rules (Required, MinLen, MaxLen, Min, Max, Email, Pattern, Custom) and a signup example exercising the full API surface.
59 lines
1.5 KiB
Go
59 lines
1.5 KiB
Go
package via
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// Field is a signal with built-in validation rules and error state.
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// It embeds *signal, so all signal methods (Bind, String, Int, Bool, SetValue, Text, ID)
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// work transparently.
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type Field struct {
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*signal
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rules []Rule
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errors []string
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initialVal any
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}
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// Validate runs all rules against the current value.
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// Clears previous errors, populates new ones, returns true if all rules pass.
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func (f *Field) Validate() bool {
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f.errors = nil
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val := f.String()
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for _, r := range f.rules {
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if err := r.validate(val); err != nil {
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f.errors = append(f.errors, err.Error())
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}
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}
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return len(f.errors) == 0
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}
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// HasError returns true if this field has any validation errors.
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func (f *Field) HasError() bool {
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return len(f.errors) > 0
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}
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// FirstError returns the first validation error message, or "" if valid.
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func (f *Field) FirstError() string {
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if len(f.errors) > 0 {
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return f.errors[0]
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}
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return ""
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}
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// Errors returns all current validation error messages.
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func (f *Field) Errors() []string {
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return f.errors
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}
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// AddError manually adds an error message (useful for server-side or cross-field validation).
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func (f *Field) AddError(msg string) {
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f.errors = append(f.errors, msg)
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}
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// ClearErrors removes all validation errors from this field.
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func (f *Field) ClearErrors() {
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f.errors = nil
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}
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// Reset restores the field value to its initial value and clears all errors.
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func (f *Field) Reset() {
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f.SetValue(f.initialVal)
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f.errors = nil
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}
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