Print.js
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/* @Print.js
* DH (http://denghao.me)
* 2017-7-14
*/
(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.setAttribute('style', 'position:absolute;width:0;height0;top:-800px;left:-800px;');
iframe.setAttribute('width', '100%');
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));