Vue利用print.js插件实现打印功能,并动态设置打印参数

一、引入print插件

1.1、新建文件夹和js文件

  • 根目录src下面新建一个plugins文件夹,下面新建一个print.js文件
  • 也可以直接npm安装插件npm install print-js --save,但直接安装的插件配置会有问题,不建议

print.js代码核心点

  • Vue.prototype的原型链上面注入$print方法
  • $print就是你在页面中调用的方法名称
const MyPlugin = {};
MyPlugin.install = function (Vue, options) {
  // 4. 添加实例方法
  Vue.prototype.$print = Print;
};
export default MyPlugin;

print.js完整代码

const Print = function (dom, options) {
  if (!(this instanceof Print)) return new Print(dom, options);

  this.options = this.extend(
    {
      noPrint: ".no-print",
      onStart: function () {},
      onEnd: function () {},
    },
    options
  );

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

  this.init();
};
Print.prototype = {
  init: function () {
    let content = this.getStyle() + this.getHtml();
    this.writeIframe(content);
  },
  extend: function (obj, obj2) {
    for (let k in obj2) {
      obj[k] = obj2[k];
    }
    return obj;
  },

  getStyle: function () {
    let str = "";
    let styles = document.querySelectorAll("style,link");
    for (let i = 0; i < styles.length; i++) {
      str += styles[i].outerHTML;
    }
    str +=
      "";

    return str;
  },

  getHtml: function () {
    var inputs = document.querySelectorAll("input");
    var textareas = document.querySelectorAll("textarea");
    var selects = document.querySelectorAll("select");
    let cells = document.querySelectorAll(".cell");

    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");
            }
          }
        }
      }
    }

    const tableNode = document.querySelectorAll(
      ".el-table__header,.el-table__body"
    );
    console.log(tableNode);
    //el-table 打印预览的时候,宽度占满
    for (let k6 = 0; k6 < tableNode.length; k6++) {
      const tableItem = tableNode[k6];
      tableItem.style.width = "100%";
    }

    return this.dom.outerHTML;
  },

  writeIframe: function (content) {
    let w;
    let doc;
    let iframe = document.createElement("iframe");
    let 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, function () {
      document.body.removeChild(iframe);
    });
  },

  toPrint: function (w, cb) {
    let _this = this;
    w.onload = function () {
      try {
        setTimeout(function () {
          w.focus();
          typeof _this.options.onStart === "function" &&
            _this.options.onStart();
          if (!w.document.execCommand("print", false, null)) {
            w.print();
          }
          typeof _this.options.onEnd === "function" && _this.options.onEnd();
          w.close();
          cb && cb();
        });
      } catch (err) {
        console.log("err", err);
      }
    };
  },
};
const MyPlugin = {};
MyPlugin.install = function (Vue, options) {
  // 4. 添加实例方法
  Vue.prototype.$print = Print;
};
export default MyPlugin;

1.2、main.js引入

// 导入打印组件
import Print from "@/plugins/Print";
Vue.use(Print);

二、使用

  • 通过ref="printArea"绑定打印区域
  • 通过class='noPrint'绑定非打印区域
    如果需要动态调整打印区,如纸张大小和边距啥的
  • 建议使用行内样式配合Vue动态绑定样式实现
    image

2.1、示例







2.2、@media print设置样式

注意:这里打印区域的样式需要写成行内样式,不然打印预览不生效
另外一种办法就是通过@media print{}在里面写样式

@media print{}就是打印媒体查询,里面的样式只会在打印或者打印预览的时候生效

 

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