print.js

// 打印类属性、方法定义

/* eslint-disable */

const Print = function (dom, options) {

  if (!(this instanceof Print)) return new Print(dom, options);

  this.options = this.extend({

    'noPrint': '.no-print'

  }, options);

  if ((typeof dom) === "string") {

    this.dom = document.querySelector(dom);

  } else {

    this.isDOM(dom)

    this.dom = this.isDOM(dom) ? dom : dom.$el;

  }

  this.init();

};

Print.prototype = {

  init: function () {

    var content = this.getStyle() + this.getHtml();

    this.writeIframe(content);

  },

  extend: function (obj, obj2) {

    for (var k in obj2) {

      obj[k] = obj2[k];

    }

    return obj;

  },

  getStyle: function () {

    var str = "",

        styles = document.querySelectorAll('style,link');

    for (var i = 0; i < styles.length; i++) {

      str += styles[i].outerHTML;

    }

    str += "<style>" + (this.options.noPrint ? this.options.noPrint : '.no-print') + "{display:none;}</style>";

    return str;

  },

  getHtml: function () {

    var inputs = document.querySelectorAll('input');

    var textareas = document.querySelectorAll('textarea');

    var selects = document.querySelectorAll('select');

    for (var k = 0; k < inputs.length; k++) {

      if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {

        if (inputs[k].checked == true) {

          inputs[k].setAttribute('checked', "checked")

        } else {

          inputs[k].removeAttribute('checked')

        }

      } else if (inputs[k].type == "text") {

        inputs[k].setAttribute('value', inputs[k].value)

      } else {

        inputs[k].setAttribute('value', inputs[k].value)

      }

    }

    for (var k2 = 0; k2 < textareas.length; k2++) {

      if (textareas[k2].type == 'textarea') {

        textareas[k2].innerHTML = textareas[k2].value

      }

    }

    for (var k3 = 0; k3 < selects.length; k3++) {

      if (selects[k3].type == 'select-one') {

        var child = selects[k3].children;

        for (var i in child) {

          if (child[i].tagName == 'OPTION') {

            if (child[i].selected == true) {

              child[i].setAttribute('selected', "selected")

            } else {

              child[i].removeAttribute('selected')

            }

          }

        }

      }

    }

    return this.dom.outerHTML;

  },

  writeIframe: function (content) {

    var w, doc, iframe = document.createElement('iframe'),

        f = document.body.appendChild(iframe);

    iframe.id = "myIframe";

    iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
    // iframe.setAttribute('style', 'position:absolute;z-index:9999;top:0;left:0;bottom:0;right:0;');

    w = f.contentWindow || f.contentDocument;

    doc = f.contentDocument || f.contentWindow.document;

    doc.open();

    doc.write(content);

    doc.close();

    var _this = this

    iframe.onload = function () {

      _this.toPrint(w);

      setTimeout(function () {

        document.body.removeChild(iframe)

      }, 100)

    }

  },

  toPrint: function (frameWindow) {
    frameWindow.document.body.style.overflow = "visible";
    try {

      setTimeout(function () {

        frameWindow.focus();

        try {

          if (!frameWindow.document.execCommand('print', false, null)) {

            frameWindow.print();

          }

        } catch (e) {

          frameWindow.print();

        }

        frameWindow.close();

      }, 10);

    } catch (err) {

      console.log('err', err);

    }

  },

  isDOM: (typeof HTMLElement === 'object') ?

      function (obj) {

        return obj instanceof HTMLElement;

      } :

      function (obj) {

        return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';

      }

};

export default Print