print 打印
呛再首 6/3/2020 技巧
# 封装工具方法
// 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>";
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;
},
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);
}
},
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.$print = Print;
};
export default MyPlugin;
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# 使用
<el-button type="primary" @click="print">普通打印</el-button>
...
print() {
//直接传入ref或者querySelector
print(this.$refs.printMain)
},
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# 指定不打印区域
1、添加no-print样式类
<div class="no-print">不要打印我</div>
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2、自定义类名
<div class="do-not-print-me-xxx">不要打印我</div>
this.$print(this.$refs.print,{'no-print':'.do-not-print-me-xxx'}) // 使用
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# 转图片再打印
import html2canvas from "html2canvas"
// 打印类属性、方法定义
/* eslint-disable */
const Print = function (dom, options) {
if (!(this instanceof Print)) return new Print(dom, options);
this.options = this.extend({
'noPrint': '.no-print'
}, options);
if ((typeof dom) === "string") {
this.cloneDom = document.querySelector(dom);
} else {
this.isDOM(dom)
this.cloneDom = this.isDOM(dom) ? dom : dom.$el;
}
//主要修改：将打印的dom转换成图片
html2canvas(this.cloneDom).then(canvas => {
this.imgmap = canvas.toDataURL()
setTimeout(()=>{
this.dom = `<div style='width:100%;height:100%;'><img style='width:100%;height:auto;' src='${this.imgmap}'/></div>`
this.init();
})
})
};
Print.prototype = {
init: function () {
var content = this.dom;
this.writeIframe(content);
},
extend: function (obj, obj2) {
for (var k in obj2) {
obj[k] = obj2[k];
}
return obj;
},
writeIframe: function (content) {
var w, doc, iframe = document.createElement('iframe'),
f = document.body.appendChild(iframe);
iframe.id = "myIframe";
//iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
w = f.contentWindow || f.contentDocument;
doc = f.contentDocument || f.contentWindow.document;
doc.open();
doc.write(content);
doc.close();
var _this = this
iframe.onload = function(){
_this.toPrint(w);
setTimeout(function () {
document.body.removeChild(iframe)
}, 100)
}
},
toPrint: function (frameWindow) {
try {
setTimeout(function () {
frameWindow.focus();
try {
if (!frameWindow.document.execCommand('print', false, null)) {
frameWindow.print();
}
} catch (e) {
frameWindow.print();
}
frameWindow.close();
}, 10);
} catch (err) {
console.log('err', err);
}
},
isDOM: (typeof HTMLElement === 'object') ?
function (obj) {
return obj instanceof HTMLElement;
} :
function (obj) {
return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string';
}
};
const MyPlugin = {}
MyPlugin.install = function (Vue, options) {
// 4. 添加实例方法
Vue.prototype.$print = Print
}
export default MyPlugin
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# 使用
import print from "./src/utils/print.js";
Vue.use(print)
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