javascript原生代码实现div局部打印,下面web建站小编给大家简单介绍一下实现代码!
定义一个print方法
(function (window, document) { var 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 () { 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, function () { document.body.removeChild(iframe) }); }, toPrint: function (w, cb) { var _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); } } } }; window.Print = Print; }(window, document));
调用方法:
document.getElementById('btn').onclick = function () { Print('#div', { //div打印内容 onStart: function () { console.log('onStart', new Date()) }, onEnd: function () { console.log('onEnd', new Date()) } }) }
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