jandl-taskmanager-app/app/src/plugins/tm@modal/_mixins/vuetify-fix-focus.ts

export default {
  // Mixin to fix autofocus on v-input in modals where date selects are used
  data() {
    return {
      preventInputFocus: false,
      savedScrollPosition: null,
    };
  },

  methods: {
    setFocusEvent() {
      const inputs = document.querySelectorAll('.v-autocomplete input');
      inputs.forEach((input) => {
        input.addEventListener('focus', this.onInputFocus);
      });
    },

    onDateFocus($event) {
      if ($event == undefined) {
        this.preventInputFocus = true;
      }
    },

    onDateOpen($event) {
      // $event should be the element reference (or any truthy value to trigger saving)
      if ($event) {
        // Find the scrollable modal container
        const modalContent = document.querySelector('.v-dialog .modal-content');
        if (modalContent) {
          this.savedScrollPosition = modalContent.scrollTop;
        }

        this.preventInputFocus = true;

        // Reset after datepicker is opened
        setTimeout(() => {
          this.preventInputFocus = false;
          this.savedScrollPosition = null;
        }, 500);
      }
    },

    onInputFocus($event) {
      const target = $event.target;

      // If we have a saved scroll position and an unwanted focus happened
      if (this.preventInputFocus && this.savedScrollPosition !== null) {
        const target = $event.target;

        // Only intercept text input focus (autocomplete fields)
        if (target.tagName === 'INPUT' && target.type === 'text') {
          const scrollBefore = document.querySelector(
            '.v-dialog .modal-content',
          )?.scrollTop;

          // Blur the focused element
          setTimeout(() => {
            target.blur();

            const modalContent = document.querySelector(
              '.v-dialog .modal-content',
            );
            if (modalContent && this.savedScrollPosition !== null) {
              modalContent.scrollTop = this.savedScrollPosition;
              const scrollAfter = modalContent.scrollTop;
            }
          }, 0);
        }
      }
    },
  },
};