我们通过前端上传到数据库的pdf或者word文档,当我们在线观看时,希望使用调用本地的打印进行实时打印;当然可能会涉及到安全问题,有需要的小伙伴,可以自行查阅。
// 打印类属性、方法定义
/* eslint-disable */
// ActiveXObject 是window自带的打印类,也就是所谓的控件
function isIE () {
if (!!window.ActiveXObject || 'ActiveXObject' in window) {
return true
} else {
return false
}
}
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.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].setAttribute('style', 'height: 320px;')
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) {
if (isIE()) {
// 通过Iframe读取
let iframe = window.open('','_blank')
iframe.document.clear()
iframe.document.write(content + '<object id="printObj" name="printObj" style="dispaly:none" classid="clsid:8856F961-340A-11D0-A96B-00C04FD705A2" height=0 width=0></object><script languge="Javascript">printObj.ExecWB(7, 1)</script>')
// iframe.print() //打印
// iframe.document.execCommand('print')
iframe.close()
} else {
var w, doc, iframe = document.createElement('iframe'),
f = document.body.appendChild(iframe)
iframe.id = 'myIframe'
iframe.name = 'myIframe'
iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;')
console.log(iframe)
w = f.contentWindow || f.contentDocument
doc = f.contentDocument || f.contentWindow.document
doc.open()
setTimeout(() => {
doc.write(content)
doc.close()
this.toPrint(w)
}, 2000);
}
},
toPrint: function (frameWindow) {
try {
setTimeout(function () {
frameWindow.focus()
try {
if (!frameWindow.document.execCommand('print', false, null)) {
frameWindow.print()
}
} catch (e) {
frameWindow.print()
}
frameWindow.close()
}, 100)
} 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