yii\validators\UrlValidator::clientValidateAttribute PHP Method

    public function clientValidateAttribute($model, $attribute, $view)
    {
        if (strpos($this->pattern, '{schemes}') !== false) {
            $pattern = str_replace('{schemes}', '(' . implode('|', $this->validSchemes) . ')', $this->pattern);
        } else {
            $pattern = $this->pattern;
        }
        $options = ['pattern' => new JsExpression($pattern), 'message' => Yii::$app->getI18n()->format($this->message, ['attribute' => $model->getAttributeLabel($attribute)], Yii::$app->language), 'enableIDN' => (bool) $this->enableIDN];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }
        if ($this->defaultScheme !== null) {
            $options['defaultScheme'] = $this->defaultScheme;
        }
        ValidationAsset::register($view);
        if ($this->enableIDN) {
            PunycodeAsset::register($view);
        }
        return 'yii.validation.url(value, messages, ' . Json::htmlEncode($options) . ');';
    }