feat: add manual validation mode

.eslintrc.json

@@ -61,10 +61,21 @@
   },
   "overrides": [
     {
-      // Prevent using optional-chaining in source files, as it is not supported by Polymer analyzer
       "files": ["packages/*/src/**/*.js"],
       "rules": {
-        "es/no-optional-chaining": "error"
+        // Prevent using optional-chaining in source files, as it is not supported by Polymer analyzer
+        "es/no-optional-chaining": "error",
+        "no-restricted-syntax": [
+          "error",
+          {
+            "selector": "ForInStatement",
+            "message": "for..in loops are slower than Object.{keys,values,entries} and have their caveats."
+          },
+          {
+            "selector": "CallExpression[callee.property.name='validate']",
+            "message": "Don't call validate() directly - it bypasses manual validation mode. Use _requestValidation() instead"
+          }
+        ]
       }
     },
     {

packages/checkbox-group/src/vaadin-checkbox-group-mixin.js

@@ -264,7 +264,7 @@ export const CheckboxGroupMixin = (superclass) =>
       });
 
       if (oldValue !== undefined) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -304,7 +304,7 @@ export const CheckboxGroupMixin = (superclass) =>
       // Do not validate when focusout is caused by document
       // losing focus, which happens on browser tab switch.
       if (!focused && document.hasFocus()) {
-        this.validate();
+        this._requestValidation();
       }
     }
   };

packages/checkbox/src/vaadin-checkbox-mixin.js

@@ -222,14 +222,14 @@ export const CheckboxMixin = (superclass) =>
       // Do not validate when focusout is caused by document
       // losing focus, which happens on browser tab switch.
       if (!focused && document.hasFocus()) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
     /** @private */
     _checkedChanged(checked) {
       if (checked || this.__oldChecked) {
-        this.validate();
+        this._requestValidation();
       }
 
       this.__oldChecked = checked;
@@ -246,7 +246,7 @@ export const CheckboxMixin = (superclass) =>
       super._requiredChanged(required);
 
       if (required === false) {
-        this.validate();
+        this._requestValidation();
       }
     }
 

packages/combo-box/src/vaadin-combo-box-light-mixin.js

@@ -99,17 +99,6 @@ export const ComboBoxLightMixin = (superClass) =>
       });
     }
 
-    /**
-     * Returns true if the current input value satisfies all constraints (if any).
-     * @return {boolean}
-     */
-    checkValidity() {
-      if (this.inputElement && this.inputElement.validate) {
-        return this.inputElement.validate();
-      }
-      return super.checkValidity();
-    }
-
     /**
      * @protected
      * @override

packages/combo-box/src/vaadin-combo-box-mixin.js

@@ -1177,7 +1177,7 @@ export const ComboBoxMixin = (subclass) =>
       // Do not validate when focusout is caused by document
       // losing focus, which happens on browser tab switch.
       if (document.hasFocus()) {
-        this.validate();
+        this._requestValidation();
       }
 
       if (this.value !== this._lastCommittedValue) {

packages/custom-field/src/vaadin-custom-field-mixin.js

@@ -159,7 +159,7 @@ export const CustomFieldMixin = (superClass) =>
       super._setFocused(focused);
 
       if (!focused) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -203,7 +203,7 @@ export const CustomFieldMixin = (superClass) =>
       super._requiredChanged(required);
 
       if (required === false) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -233,7 +233,7 @@ export const CustomFieldMixin = (superClass) =>
       event.stopPropagation();
 
       this.__setValue();
-      this.validate();
+      this._requestValidation();
       this.dispatchEvent(
         new CustomEvent('change', {
           bubbles: true,
@@ -299,7 +299,7 @@ export const CustomFieldMixin = (superClass) =>
       this.__applyInputsValue(value || '\t');
 
       if (oldValue !== undefined) {
-        this.validate();
+        this._requestValidation();
       }
     }
 

packages/date-picker/src/vaadin-date-picker-mixin.js

@@ -479,7 +479,7 @@ export const DatePickerMixin = (subclass) =>
         // Do not validate when focusout is caused by document
         // losing focus, which happens on browser tab switch.
         if (document.hasFocus()) {
-          this.validate();
+          this._requestValidation();
         }
       }
     }
@@ -624,13 +624,8 @@ export const DatePickerMixin = (subclass) =>
         !this._selectedDate || dateAllowed(this._selectedDate, this._minDate, this._maxDate, this.isDateDisabled);
 
       let inputValidity = true;
-      if (this.inputElement) {
-        if (this.inputElement.checkValidity) {
-          inputValidity = this.inputElement.checkValidity();
-        } else if (this.inputElement.validate) {
-          // Iron-form-elements have the validate API
-          inputValidity = this.inputElement.validate();
-        }
+      if (this.inputElement && this.inputElement.checkValidity) {
+        inputValidity = this.inputElement.checkValidity();
       }
 
       return inputValid && isDateValid && inputValidity;
@@ -717,10 +712,10 @@ export const DatePickerMixin = (subclass) =>
       const unparsableValue = this.__unparsableValue;
 
       if (this.__committedValue !== this.value) {
-        this.validate();
+        this._requestValidation();
         this.dispatchEvent(new CustomEvent('change', { bubbles: true }));
       } else if (this.__committedUnparsableValue !== unparsableValue) {
-        this.validate();
+        this._requestValidation();
         this.dispatchEvent(new CustomEvent('unparsable-change'));
       }
 
@@ -849,7 +844,7 @@ export const DatePickerMixin = (subclass) =>
 
           if (oldValue !== undefined) {
             // Validate only if `value` changes after initialization.
-            this.validate();
+            this._requestValidation();
           }
         }
       } else {
@@ -1015,7 +1010,7 @@ export const DatePickerMixin = (subclass) =>
       // Needed in case the value was not changed: open and close dropdown,
       // especially on outside click. On Esc key press, do not validate.
       if (!this.value && !this._keyboardActive) {
-        this.validate();
+        this._requestValidation();
       }
     }
 

packages/date-time-picker/src/vaadin-date-time-picker-mixin.js

@@ -370,7 +370,7 @@ export const DateTimePickerMixin = (superClass) =>
       // Do not validate when focusout is caused by document
       // losing focus, which happens on browser tab switch.
       if (!focused && document.hasFocus()) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -414,7 +414,7 @@ export const DateTimePickerMixin = (superClass) =>
       event.stopPropagation();
 
       if (this.__dispatchChangeForValue === this.value) {
-        this.validate();
+        this._requestValidation();
         this.__dispatchChange();
       }
       this.__dispatchChangeForValue = undefined;
@@ -473,7 +473,7 @@ export const DateTimePickerMixin = (superClass) =>
       newDatePicker.max = this.__formatDateISO(this.__maxDateTime, this.__defaultDateMinMaxValue);
 
       // Disable default internal validation for the component
-      newDatePicker.validate = () => {};
+      newDatePicker.manualValidation = true;
     }
 
     /** @private */
@@ -501,7 +501,7 @@ export const DateTimePickerMixin = (superClass) =>
       this.__updateTimePickerMinMax();
 
       // Disable default internal validation for the component
-      newTimePicker.validate = () => {};
+      newTimePicker.manualValidation = true;
     }
 
     /** @private */
@@ -603,7 +603,7 @@ export const DateTimePickerMixin = (superClass) =>
       }
 
       if (this.__oldRequired && !required) {
-        this.validate();
+        this._requestValidation();
       }
 
       this.__oldRequired = required;
@@ -796,7 +796,7 @@ export const DateTimePickerMixin = (superClass) =>
       this.__updateTimePickerMinMax();
 
       if (this.__datePicker && this.__timePicker && this.value) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -809,7 +809,7 @@ export const DateTimePickerMixin = (superClass) =>
       this.__updateTimePickerMinMax();
 
       if (this.__datePicker && this.__timePicker && this.value) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -910,7 +910,7 @@ export const DateTimePickerMixin = (superClass) =>
         // run initial validation here. Lit version runs observers differently and
         // this observer is executed first - ignore it to prevent validating twice.
         if ((this.min && this.__minDateTime) || (this.max && this.__maxDateTime)) {
-          this.validate();
+          this._requestValidation();
         }
       }
     }

packages/field-base/src/input-constraints-mixin.js

@@ -90,8 +90,8 @@ export const InputConstraintsMixin = dedupingMixin(
         const isLastConstraintRemoved = this.__previousHasConstraints && !hasConstraints;
 
         if ((this._hasValue || this.invalid) && hasConstraints) {
-          this.validate();
-        } else if (isLastConstraintRemoved) {
+          this._requestValidation();
+        } else if (isLastConstraintRemoved && !this.manualValidation) {
           this._setInvalid(false);
         }
 
@@ -109,7 +109,7 @@ export const InputConstraintsMixin = dedupingMixin(
       _onChange(event) {
         event.stopPropagation();
 
-        this.validate();
+        this._requestValidation();
 
         this.dispatchEvent(
           new CustomEvent('change', {

packages/field-base/src/input-field-mixin.js

@@ -97,7 +97,7 @@ export const InputFieldMixin = (superclass) =>
       // Do not validate when focusout is caused by document
       // losing focus, which happens on browser tab switch.
       if (!focused && document.hasFocus()) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -112,7 +112,7 @@ export const InputFieldMixin = (superclass) =>
       super._onInput(event);
 
       if (this.invalid) {
-        this.validate();
+        this._requestValidation();
       }
     }
 
@@ -133,7 +133,7 @@ export const InputFieldMixin = (superclass) =>
       }
 
       if (this.invalid) {
-        this.validate();
+        this._requestValidation();
       }
     }
   };

packages/field-base/src/validate-mixin.d.ts

@@ -16,6 +16,19 @@ export declare class ValidateMixinClass {
    */
   invalid: boolean;
 
+  /**
+   * Set to true to enable manual validation mode. This mode disables automatic
+   * constraint validation, allowing you to control the validation process yourself.
+   * You can still trigger constraint validation manually with the `validate()` method
+   * or use `checkValidity()` to assess the component's validity without affecting
+   * the invalid state. In manual validation mode, you can also manipulate
+   * the `invalid` property directly through your application logic without conflicts
+   * with the component's internal validation.
+   *
+   * @attr {boolean} manual-validation
+   */
+  manualValidation: boolean;
+
   /**
    * Specifies that the user must fill in a value.
    */
@@ -30,4 +43,6 @@ export declare class ValidateMixinClass {
    * Returns true if the field value satisfies all constraints (if any).
    */
   checkValidity(): boolean;
+
+  protected _requestValidation(): void;
 }

packages/field-base/src/validate-mixin.js

@@ -25,6 +25,22 @@ export const ValidateMixin = dedupingMixin(
             value: false,
           },
 
+          /**
+           * Set to true to enable manual validation mode. This mode disables automatic
+           * constraint validation, allowing you to control the validation process yourself.
+           * You can still trigger constraint validation manually with the `validate()` method
+           * or use `checkValidity()` to assess the component's validity without affecting
+           * the invalid state. In manual validation mode, you can also manipulate
+           * the `invalid` property directly through your application logic without conflicts
+           * with the component's internal validation.
+           *
+           * @attr {boolean} manual-validation
+           */
+          manualValidation: {
+            type: Boolean,
+            value: false,
+          },
+
           /**
            * Specifies that the user must fill in a value.
            */
@@ -79,6 +95,14 @@ export const ValidateMixin = dedupingMixin(
         return true;
       }
 
+      /** @protected */
+      _requestValidation() {
+        if (!this.manualValidation) {
+          // eslint-disable-next-line no-restricted-syntax
+          this.validate();
+        }
+      }
+
       /**
        * Fired whenever the field is validated.
        *