vue实现页面打印自动分页的两种方法
本文实例为大家分享了vue实现页面打印自动分页的具体代码,供大家参考,具体内容如下
一、通过ref方式获取元素进行打印
1.封装一个js文件
// 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>"; str += "<style>html,body,div{height: auto!important;font-size:12px}</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; // 包裹要打印的元素 // fix: https://github.com/xyl66/vuePlugs_printjs/issues/36 // let outerHTML = this.wrapperRefDom(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.$printPage = Print } export default MyPlugin
2.把文件放在项目里面的某一个文件夹
3.在main.js里面全局引用
4.页面使用
备注:不需要打印的内容直接设置class为no-print即可
二、使用浏览器自带的window.print()方法获取html内容进行打印
缺点:样式只能写在标签上面,否则不生效
1.封装一个js文件
export default function printHtml(html) { let style = getStyle(); let container = getContainer(html); document.body.appendChild(style); document.body.appendChild(container); getLoadPromise(container).then(() => { window.print(); document.body.removeChild(style); document.body.removeChild(container); }); } // 设置打印样式 function getStyle() { let styleContent = `#print-container { display: none; } @media print { body > :not(.print-container) { display: none; } html, body { margin: 0 0.2cm; display: block !important; height:auto; } #print-container { display: block; } @page { margin: 0.25cm 0; } }`; let style = document.createElement("style"); style.innerHTML = styleContent; return style; } // 清空打印内容 function cleanPrint() { let div = document.getElementById('print-container') if (!!div) { document.querySelector('body').removeChild(div) } } // 新建DOM,将需要打印的内容填充到DOM function getContainer(html) { cleanPrint() let container = document.createElement("div"); container.setAttribute("id", "print-container"); container.innerHTML = html; return container; } // 图片完全加载后再调用打印方法 function getLoadPromise(dom) { let imgs = dom.querySelectorAll("img"); imgs = [].slice.call(imgs); if (imgs.length === 0) { return Promise.resolve(); } let finishedCount = 0; return new Promise(resolve => { function check() { finishedCount++; if (finishedCount === imgs.length) { resolve(); } } imgs.forEach(img => { img.addEventListener("load", check); img.addEventListener("error", check); }) }); }
2.把文件放在项目里面的某一个文件夹
3.页面直接引入
4.页面使用
备注:不需要打印的内容直接在标签上设置样式display: none;即可
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