BookStack/resources/assets/js/vues/tag-manager.js

const draggable = require('vuedraggable');

let data = {
    pageId: false,
    tags: [],
};

const components = {draggable};

let computed = {

};

let methods = {

    addEmptyTag() {
        this.tags.push({name: '', value: '', key: Math.random().toString(36).substring(7)});
    },

    /**
     * When an tag changes check if another empty editable field needs to be added onto the end.
     * @param tag
     */
    tagChange(tag) {
        let tagPos = this.tags.indexOf(tag);
        if (tagPos !== this.tags.length-1 || tag.name !== '' || tag.value !== '') return;
        this.addEmptyTag();
    },

    /**
     * When an tag field loses focus check the tag to see if its
     * empty and therefore could be removed from the list.
     * @param tag
     */
    tagBlur(tag) {
        let isLast = (this.tags.indexOf(tag) === this.tags.length-1);
        if (tag.name !== '' || tag.value !== '' || isLast) return;
        let cPos = this.tags.indexOf(tag);
        this.tags.splice(cPos, 1);
    },

    removeTag(tag) {
        let tagPos = this.tags.indexOf(tag);
        if (tagPos === -1) return;
        this.tags.splice(tagPos, 1);
    }
};

function mounted() {
    this.pageId = Number(this.$el.getAttribute('page-id'));

    let url = window.baseUrl(`/ajax/tags/get/page/${this.pageId}`);
    this.$http.get(url).then(response => {
        let tags = response.data;
        for (let i = 0, len = tags.length; i < len; i++) {
            tags[i].key = Math.random().toString(36).substring(7);
        }
        this.tags = tags;
        this.addEmptyTag();
    });
}

module.exports = {
    data, computed, methods, mounted, components
};