footer_manager.js

var FooterManager = function(table){
    this.table = table;
    this.active = false;
    this.element = this.createElement(); //containing element
    this.external = false;
    this.links = [];

    this._initialize();
};

FooterManager.prototype.createElement = function (){
    var el = document.createElement("div");

    el.classList.add("tabulator-footer");

    return el;
};

FooterManager.prototype._initialize = function(element){
    if(this.table.options.footerElement){

        switch(typeof this.table.options.footerElement){
            case "string":

            if(this.table.options.footerElement[0] === "<"){
                this.element.innerHTML = this.table.options.footerElement;
            }else{
                this.external = true;
                this.element = document.querySelector(this.table.options.footerElement);
            }
            break;
            default:
            this.element = this.table.options.footerElement;
            break;
        }

    }
};

FooterManager.prototype.getElement = function(){
    return this.element;
};


FooterManager.prototype.append = function(element, parent){
    this.activate(parent);

    this.element.appendChild(element);
    this.table.rowManager.adjustTableSize();
};

FooterManager.prototype.prepend = function(element, parent){
    this.activate(parent);

    this.element.insertBefore(element, this.element.firstChild);
    this.table.rowManager.adjustTableSize();
};

FooterManager.prototype.remove = function(element){
    element.parentNode.removeChild(element);
    this.deactivate();
};

FooterManager.prototype.deactivate = function(force){
    if(!this.element.firstChild || force){
        if(!this.external){
            this.element.parentNode.removeChild(this.element);
        }
        this.active = false;
    }

    // this.table.rowManager.adjustTableSize();
};

FooterManager.prototype.activate = function(parent){
    if(!this.active){
        this.active = true;
        if(!this.external){
            this.table.element.appendChild(this.getElement());
            this.table.element.style.display = '';
        }
    }

    if(parent){
        this.links.push(parent);
    }
};

FooterManager.prototype.redraw = function(){
    this.links.forEach(function(link){
        link.footerRedraw();
    });
};