Form validation

app/handlers/interactive.go

@@ -11,7 +11,7 @@ import (
 )
 
 var pcInteractive templates.PageContext = templates.PageContext{
-	Title:      "Welcome to the demo",
+	Title:      "Welcome to the demo - Interactive",
 	ActivePage: "interactive",
 }
 
@@ -50,3 +50,38 @@ func FilterCatBreeds(c *gin.Context) {
 
 	templates.RenderCatBreedsTable(catBreeds).Render(c, c.Writer)
 }
+
+func ValidateForm(c *gin.Context) {
+	content := templates.ValidateFormContent{
+		Validated: true,
+		NumValue:  c.PostForm("number-value"),
+		StrValue:  c.PostForm("string-value"),
+	}
+
+	numValue, err := strconv.Atoi(content.NumValue)
+	if err != nil {
+		content.HasNumValueError = true
+		content.NumValueError = "This is not valid number"
+	}
+	if !content.HasNumValueError {
+		if numValue < 0 {
+			content.HasNumValueError = true
+			content.NumValueError = "Value is less than 0"
+		}
+		if numValue > 100 {
+			content.HasNumValueError = true
+			content.NumValueError = "Value is greater than 100"
+		}
+	}
+
+	if len(content.StrValue) < 5 {
+		content.HasStrValueError = true
+		content.StrValueError = "String length is less than 5"
+	}
+	if len(content.StrValue) > 10 {
+		content.HasStrValueError = true
+		content.StrValueError = "String length is more than 10"
+	}
+
+	templates.RenderInteractiveForm(content).Render(c, c.Writer)
+}