vue原生js打印插件

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需求

在vue单页面应用中打印目标区域

---

解决方案

• 使用原生window.print

var printhtml = window.getElementById(dom).innerHtml // 获取打印区域
var oldhtml = document.innerHtml // 保存原始内容
document.innerHtml = printhtml // 赋值打印
window.print()
document.innerHtml = oldhtml // 还原页面
window.location.reload() // 刷新解决页面无法点击

问题还原页面点击事件不响应，刷新后页面重新加载体验不好

• 使用print.js 原生js插件
  

文章引用自 原生js打印插件Print.js

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.dom = dom;
  }

  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 in inputs) {
      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)
      }
    }

    for (var k2 in textareas) {
      if (textareas[k2].type == 'textarea') {
        textareas[k2].innerHTML = textareas[k2].value
      }
    }

    for (var k3 in selects) {
      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.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";

    w = f.contentWindow || f.contentDocument;
    doc = f.contentDocument || f.contentWindow.document;
    doc.open();
    doc.write(content);
    doc.close();
    this.toPrint(w);

    setTimeout(function () {
      document.body.removeChild(iframe)
    }, 100)
  },

  toPrint: function (frameWindow) {
    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);
    }
  }
};

结果可以打印，打印完可直接操作页面

---

插件化

插件git地址vue打印插件
使用方法

import Print from '@/plugs/print'
Vue.use(Print) // 注册
<template>
<section ref="print">
    打印内容
    <div class="no-print">不要打印我</div>
</section>
</template>
this.$print(this.$ref.print) // 使用

注意事项
需使用ref获取dom节点，若直接通过id或class获取则webpack打包部署后打印内容为空
指定不打印区域
方法一. 添加no-print样式类

<div class="no-print">不要打印我</div>

方法二. 自定义类名

<div class="do-not-print-me-xxx">不要打印我</div>
this.$print(this.$ref.print,{'no-print':'.do-not-print-me-xxx'}) // 使用