Method constructor

src/dropzone.js:63–177

(el, options)

  }

  constructor(el, options) {
    super();
    let fallback, left;
    this.element = el;
    // For backwards compatibility since the version was in the prototype previously
    this.version = Dropzone.version;

    this.clickableElements = [];
    this.listeners = [];
    this.files = []; // All files

    if (typeof this.element === "string") {
      this.element = document.querySelector(this.element);
    }

    // Not checking if instance of HTMLElement or Element since IE9 is extremely weird.
    if (!this.element || this.element.nodeType == null) {
      throw new Error("Invalid dropzone element.");
    }

    if (this.element.dropzone) {
      throw new Error("Dropzone already attached.");
    }

    // Now add this dropzone to the instances.
    Dropzone.instances.push(this);

    // Put the dropzone inside the element itself.
    this.element.dropzone = this;

    let elementOptions =
      (left = Dropzone.optionsForElement(this.element)) != null ? left : {};

    this.options = Dropzone.extend(
      {},
      defaultOptions,
      elementOptions,
      options != null ? options : {}
    );

    this.options.previewTemplate = this.options.previewTemplate.replace(
      /\n*/g,
      ""
    );

    // If the browser failed, just call the fallback and leave
    if (this.options.forceFallback || !Dropzone.isBrowserSupported()) {
      return this.options.fallback.call(this);
    }

    // @options.url = @element.getAttribute "action" unless @options.url?
    if (this.options.url == null) {
      this.options.url = this.element.getAttribute("action");
    }

    if (!this.options.url) {
      throw new Error("No URL provided.");
    }