vue print.js 打印el-table 丢失列解决方法

  print.js 可打印echarts图表

 

vue  print.js 打印el-table 丢失列解决方法，搜索了网上解决方案，修改源码如下： 红色字段重要

https://blog.csdn.net/admin11196/article/details/116168923   这个连接下的有个园有回答的，我整合到代码中了，亲测好用~真香哈哈

const 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() {
        let content = this.getStyle() + this.getHtml();
        this.writeIframe(content);
    },
    extend: function(obj, obj2) {
        for (let k in obj2) {
            obj[k] = obj2[k];
        }
        return obj;
    },

    getStyle: function() {
        let str = "";
        let styles = document.querySelectorAll('style,link');
        for (let 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() {
        let inputs = document.querySelectorAll('input');
        let textareas = document.querySelectorAll('textarea');
        let selects = document.querySelectorAll('select');
        let canvass = document.querySelectorAll('canvas');
        let cells = document.querySelectorAll('.cell');


        for (let 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 (let k2 in textareas) {
            if (textareas[k2].type === 'textarea') {
                textareas[k2].innerHTML = textareas[k2].value;
            }
        }

        for (let k3 in selects) {
            if (selects[k3].type === 'select-one') {
                let child = selects[k3].children;
                for (let i in child) {
                    if (child[i].tagName === 'OPTION') {
                        if (child[i].selected === true) {
                            child[i].setAttribute('selected', "selected");
                        } else {
                            child[i].removeAttribute('selected');
                        }
                    }
                }
            }
        }

        //chart转图片
        for (var k4 = 0; k4 < canvass.length; k4++) {
            var imageURL = canvass[k4].toDataURL("image/png");
            var img = document.createElement("img");
            img.src = imageURL;
            img.setAttribute('style', 'max-width: 100%;');
            img.className = 'isNeedRemove'
            canvass[k4].parentNode.style.width = '100%'
            canvass[k4].parentNode.style.height = '500px'
            canvass[k4].parentNode.style.textAlign = 'center'
            canvass[k4].parentNode.insertBefore(img, canvass[k4].nextElementSibling);

        }

        const tableNode = document.querySelectorAll('.el-table__header,.el-table__body');
        //el-table 打印不全的问题
        for (let k6 = 0; k6 < tableNode.length; k6++) {
            const tableItem = tableNode[k6];
            tableItem.style.width = '100%';
            const child = tableItem.childNodes;
            for (let i = 0; i < child.length; i++) {
                const element = child[i];
                if (element.localName === 'colgroup') {
                    element.innerHTML = '';
                }
            }
        }
        //el-table 格子里面打印超过格子的问题
        for (let k7 = 0; k7 < cells.length; k7++) {
            const cell = cells[k7];
            cell.style.width = '100%';
            cell.removeAttribute('style')
        }


        return this.dom.outerHTML;
    },

    writeIframe: function(content) {
        let w;
        let doc;
        let iframe = document.createElement('iframe');
        let 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();

        var removes = document.querySelectorAll('.isNeedRemove');
        for (var k = 0; k < removes.length; k++) {
            removes[k].parentNode.removeChild(removes[k]);
        }
        this.toPrint(w, function() {
            document.body.removeChild(iframe);
        });
    },

    toPrint: function(w, cb) {
        let _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);
            }
        };
    }
};
const MyPlugin = {};
MyPlugin.install = function(Vue, options) {
    // 4. 添加实例方法
    Vue.prototype.$print = Print;
};
export default MyPlugin;