vue 打印

Posted 2023-02-22 黑胡子大叔的小屋

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')
            
          
        
      
    
    // 包裹要打印的元素
    // fix: https://github.com/xyl66/vuePlugs_printjs/issues/36
    let outerHTML = this.dom.outerHTML
    return outerHTML;
  ,
  // 向父级元素循环，包裹当前需要打印的元素
  // 防止根级别开头的 css 选择器不生效
  wrapperRefDom: function (refDom) 
    let prevDom = null
    let currDom = refDom
    // 判断当前元素是否在 body 中，不在文档中则直接返回该节点
    if (!this.isInBody(currDom)) return currDom

    while (currDom) 
      if (prevDom) 
        let element = currDom.cloneNode(false)
        element.appendChild(prevDom)
        prevDom = element
       else 
        prevDom = currDom.cloneNode(true)
      

      currDom = currDom.parentElement
    

    return prevDom
  ,

  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;";
    iframe.setAttribute('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();
    var _this = this
    iframe.onload = function()
      _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);
    
  ,
  // 检查一个元素是否是 body 元素的后代元素且非 body 元素本身
  isInBody: function (node) 
    return (node === document.body) ? false : document.body.contains(node);
  ,
  isDOM: (typeof HTMLElement === 'object') ?
    function (obj) 
      return obj instanceof HTMLElement;
     :
    function (obj) 
      return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';
    
;
const MyPlugin = 
MyPlugin.install = function (Vue, options) 
  // 4. 添加实例方法
  Vue.prototype.$print = Print

export default MyPlugin

全局注册

import Print from "@/utils/print"
Vue.use(Print)

使用

<div ref="printContent"> 打印内容 </div>
<script>
doPrint()
   this.$print(this.$refs.printContent)

</script>