vue3 前端实现pdf打印预览 printjs

• 在utils建print.ts文件
  interface PrintFunction {
  extendOptions: Function;
  getStyle: Function;
  setDomHeight: Function;
  toPrint: Function;
  }
  const Print = function (dom, options?: object): PrintFunction {
  options = options || {};
  // @ts-expect-error
  if (!(this instanceof Print)) return new Print(dom, options);
  this.conf = {
  styleStr: “”,
  // Elements that need to dynamically get and set the height
  setDomHeightArr: [],
  // Callback before printing
  printBeforeFn: null,
  // Callback after printing
  printDoneCallBack: null
  };
  for (const key in this.conf) {
  // eslint-disable-next-line no-prototype-builtins
  if (key && options.hasOwnProperty(key)) {
  this.conf[key] = options[key];
  }
  }
  if (typeof dom === “string”) {
  this.dom = document.querySelector(dom);
  } else {
  this.dom = this.isDOM(dom) ? dom : dom.$el;
  }
  if (this.conf.setDomHeightArr && this.conf.setDomHeightArr.length) {
  this.setDomHeight(this.conf.setDomHeightArr);
  }
  this.init();
  };
  Print.prototype = {
  /**
  
  
  
  • init
    /
    init: function (): void {
    const content = this.getStyle() + this.getHtml();
    this.writeIframe(content);
    },
    /*
    
  • Configuration property extension
    
  • @param {Object} obj
    
  • @param {Object} obj2
    /
    extendOptions: function (obj, obj2: T): T {
    for (const k in obj2) {
    obj[k] = obj2[k];
    }
    return obj;
    },
    /*
    Copy all styles of the original page
    */
    getStyle: function (): string {
    let str = “”;
    const styles: NodeListOf = document.querySelectorAll(“style,link”);
    for (let i = 0; i < styles.length; i++) {
    str += styles.outerHTML;
    }
    str += <style>.no-print{display:none;}${this.conf.styleStr}</style>;
    return str;
    },
    // form assignment
    getHtml: function (): Element {
    const inputs = document.querySelectorAll(“input”);
    const selects = document.querySelectorAll(“select”);
    const textareas = document.querySelectorAll(“textarea”);
    const canvass = document.querySelectorAll(“canvas”);
    
  1. for (let k = 0; k < inputs.length; k++) {
  2.   if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {
  3.     if (inputs[k].checked == true) {
  4.       inputs[k].setAttribute("checked", "checked");
  5.     } else {
  6.       inputs[k].removeAttribute("checked");
  7.     }
  8.   } else if (inputs[k].type == "text") {
  9.     inputs[k].setAttribute("value", inputs[k].value);
  10.   } else {
  11.     inputs[k].setAttribute("value", inputs[k].value);
  12.   }
  13. }
  15. for (let k2 = 0; k2 < textareas.length; k2++) {
  16.   if (textareas[k2].type == "textarea") {
  17.     textareas[k2].innerHTML = textareas[k2].value;
  18.   }
  19. }
  21. for (let k3 = 0; k3 < selects.length; k3++) {
  22.   if (selects[k3].type == "select-one") {
  23.     const child = selects[k3].children;
  24.     for (const i in child) {
  25.       if (child[i].tagName == "OPTION") {
  26.         if ((child[i] as any).selected == true) {
  27.           child[i].setAttribute("selected", "selected");
  28.         } else {
  29.           child[i].removeAttribute("selected");
  30.         }
  31.       }
  32.     }
  33.   }
  34. }
  36. for (let k4 = 0; k4 < canvass.length; k4++) {
  37.   const imageURL = canvass[k4].toDataURL("image/png");
  38.   const img = document.createElement("img");
  39.   img.src = imageURL;
  40.   img.setAttribute("style", "max-width: 100%;");
  41.   img.className = "isNeedRemove";
  42.   canvass[k4].parentNode.insertBefore(img, canvass[k4].nextElementSibling);
  43. }
  45. return this.dom.outerHTML;

  复制代码
  },
  /**
  create iframe
  */
  writeIframe: function (content) {
  let w: Document | Window;
  let doc: Document;
  const iframe: HTMLIFrameElement = document.createElement(“iframe”);
  const f: HTMLIFrameElement = document.body.appendChild(iframe);
  iframe.id = “myIframe”;
  iframe.setAttribute(
  “style”,
  “position:absolute;width:0;height:0;top:-10px;left:-10px;”
  );
  // eslint-disable-next-line prefer-const
  w = f.contentWindow || f.contentDocument;
  // eslint-disable-next-line prefer-const
  doc = f.contentDocument || f.contentWindow.document;
  doc.open();
  doc.write(content);
  doc.close();
  
  1. const removes = document.querySelectorAll(".isNeedRemove");
  2. for (let k = 0; k < removes.length; k++) {
  3.   removes[k].parentNode.removeChild(removes[k]);
  4. }
  6. // eslint-disable-next-line @typescript-eslint/no-this-alias
  7. const _this = this;
  8. iframe.onload = function (): void {
  9.   // Before popping, callback
  10.   if (_this.conf.printBeforeFn) {
  11.     _this.conf.printBeforeFn({ doc });
  12.   }
  13.   _this.toPrint(w);
  14.   setTimeout(function () {
  15.     document.body.removeChild(iframe);
  16.     // After popup, callback
  17.     if (_this.conf.printDoneCallBack) {
  18.       _this.conf.printDoneCallBack();
  19.     }
  20.   }, 100);
  21. };

  复制代码
  },
  /**
  Print
  /
  toPrint: function (frameWindow): void {
  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.error(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”
  );
  },
  /*
     
  
  
  
  • Set the height of the specified dom element by getting the existing height of the dom element and setting
    
  • @param {Array} arr
    */
    setDomHeight(arr) {
    if (arr && arr.length) {
    arr.forEach(name => {
    const domArr = document.querySelectorAll(name);
    console.log(name, domArr);
    domArr.forEach(dom => {
    dom.style.height = dom.offsetHeight + “px”;
    });
    });
    }
    }
    };
    
  export default Print;
  
  
• .vue页面利用
  html
  
  1. <div class="w-full p-1" id="printApply" style="overflow: auto">
  2.   <div class="text-center text-2xl">江苏微导纳米股份有限公司</div>
  3.   <div class="text-center text-xl mb-6 mt-2">
  4.     工具出库单
  5.   </div>
  6.   <div class="flex">
  7.     <div class="flex-1 mb-2">
  8.       <div class="mb-3">事业部：{{ dataSource.chargeDept }}</div>
  9.       <div class="mb-3">班组: {{ dataSource.groupName }}</div>
  10.       <div class="">联系人： ____________________</div>
  11.     </div>
  12.     <div class="flex-1 mb-2">
  13.       <div class="mb-3">申请人：{{ dataSource.applicant }}</div>
  14.       <div class="mb-3">申请部门：{{ dataSource.applicantDept }}</div>
  15.       <div class="">联系电话： _____________________</div>
  16.     </div>
  17.     <div class="flex-1 mb-2">
  18.       <div class="mb-3">工具属性：{{ dataSource.toolProperty }}</div>
  19.       <div class="mb-3">工厂: {{ dataSource.factoryName }}</div>
  20.     </div>
  21.   </div>
  22.   <div class="my-3 w-full">
  23.     <table>
  24.       <colgroup>
  25.         <col width="50" />
  26.         <col width="120" />
  27.         <col width="150" />
  28.         <col width="150" />
  29.         <col width="100" />
  30.         <col width="100" />
  31.         <col width="100" />
  32.         <col width="100" />
  33.       </colgroup>
  34.       <tbody>
  35.         <tr height="32" class="">
  36.           <td class="text-center font-bold">序号</td>
  37.           <td class="text-center font-bold">存货编码</td>
  38.           <td class="text-center font-bold">存货名称</td>
  39.           <td class="text-center font-bold">需求时间</td>
  40.           <td class="text-center font-bold">重要程度</td>
  41.           <td class="text-center font-bold">请购用途</td>
  42.           <td class="text-center font-bold">规格型号</td>
  43.           <!-- <td class="text-center font-bold">工具大类</td> -->
  44.           <td class="text-center font-bold">申领数量</td>
  45.         </tr>
  46.         <template v-for="(item, index) in dataSource.lists">
  47.           <tr height="32">
  48.             <td class="text-center">{{ index+1 }}</td>
  49.             <td class="text-center">{{ item.cInvCode }}</td>
  50.             <td class="text-center">{{ item.cInvName }}</td>
  51.             <td class="text-center">{{ item.demandTime&&item.demandTime.slice(0, 10) }}</td>
  52.             <td class="text-center">{{ item.significance }}</td>
  53.             <td class="text-center">{{ item.purpose }}</td>
  54.             <td class="text-center">{{ item.cInvStd }}</td>
  55.             <!-- <td class="text-center">{{ item.toolType }}</td> -->
  56.             <td class="text-center">{{ item.applicationQty }}</td>
  57.           </tr>
  58.          
  59.         </template>
  60.         <tr height="32">
  61.           <td class="text-center font-bold">合计：</td>
  62.           <td colspan="6" class="text-left"></td>
  63.           <td class="text-center">{{sum}}</td>
  64.         </tr>
  65.         <tr height="65">
  66.           <td colspan="8" class="text-left ">
  67.             备注：
  68.             <br />
  69.             1、请双方确认无误后签字确认，谢谢！
  70.           </td>
  71.         </tr>
  72.       </tbody>
  73.     </table>
  74.   </div>
  75.   <div class="w-4/5 mt-2 flex justify-around">
  76.     <div class="">
  77.       <div class="">发起人签字:</div>
  78.       <div class="mt-2">发起日期:</div>
  79.     </div>
  80.     <div class="">
  81.       <div class="">审批人签字:</div>
  82.       <div class="mt-2">审批日期:</div>
  83.     </div>
  84.   </div>
  85. </div>

  复制代码

css

1. #printApply {
2.   display: none;
3. }
4. // 设置打印的时候，显示
5. #printApply {
6.   @media print {
7.     display: block;
8.   }
9. }
11. #printApply table {
12.   border-top: 1px solid #333;
13.   border-left: 1px solid #333;
14.   border-spacing: 0;
15.   background-color: #fff;
16.   width: 100%;
17. }
18. #printApply table td {
19.   border-bottom: 1px solid #333;
20.   border-right: 1px solid #333;
21.   font-size: 14px;
22.   padding: 5px;
23. }

复制代码

ts

1. import {
2.   Printer
3. } from "@element-plus/icons-vue";
4. import Print from "@/utils/print";
6. const dataSource = ref({
7.   chargeDept: "",
8.   groupName: "",
9.   applicant: "",
10.   applicantDept: "",
11.   toolProperty: "",
12.   factoryName: "",
13.   lists: []
14. })
15. let sum = 0
16. const handlePrint = async (row) => {
17.   sum = 0
18.   dataSource.value = row
19.   dataSource.value.lists.forEach((item) => {
20.     sum += item.applicationQty
21.   })
22.   setTimeout(() => {
23.     Print("#printApply").toPrint;
24.   },500)
25. };

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注意：在主页面打印 需要给#printApply设置隐蔽 设置打印的时候，再显示，即

1. #printApply {
2.   display: none;
3. }
4. #printApply {
5.   @media print {
6.    display: block;
7.   }
8. }

复制代码

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