模板引擎doT.js介绍及如何判断对象为空、如何嵌套循环···

时间：2021-01-08 09:06:22

JS模板引擎像百度的baiduTemplate(百度)\artTemplate（腾讯）\juicer（淘宝）\doT\ tmpl\ handlebars\ easyTemplate\ underscoretemplate \ mustache \kissytemplate

doT.js 灵感来源于搜寻基于 V8 和 Node.js ，强调性能，最快速最简洁的 JavaScript 模板函数

引入 javascript 文件：

<script type="text/javascript" src="doT.js"></script>

doT.templateSettings - 默认编译设置

可以通过改变编译设置自定义 doT。这是默认设置：

doT.templateSettings = {

  evaluate:    /\{\{([\s\S]+?)\}\}/g,

  interpolate: /\{\{=([\s\S]+?)\}\}/g,

  encode:      /\{\{!([\s\S]+?)\}\}/g,

  use:         /\{\{#([\s\S]+?)\}\}/g,

  define:      /\{\{##\s*([\w\.$]+)\s*(\:|=)([\s\S]+?)#\}\}/g,

  conditional: /\{\{\?(\?)?\s*([\s\S]*?)\s*\}\}/g,

  iterate:     /\{\{~\s*(?:\}\}|([\s\S]+?)\s*\:\s*([\w$]+)\s*(?:\:\s*([\w$]+))?\s*\}\})/g,

  varname: 'it',

  strip: true,

  append: true,

  selfcontained: false

};

如果你想用自己的定界符，可以修改 doT.templateSettings 中的正则表达式。

这是默认的定界符列表：

{{ }}    用于求值(evaluation)

{{= }}    用于插值(interpolation)

{{! }}    用于编码求值(interpolation with encoding)

{{# }}    用于编译时求值/引入和局部模板(compile-time evaluation/includes and partials)

{{## #}}    用于编译时定义(compile-time defines)

{{? }}    条件语句(conditionals)

{{~ }}    数组迭代(array iteration)

调用方式：
var tmpText = doT.template(模板);
tmpText(数据源);

用法示例：

for 循环前判断循环的list是否为空

　　　　　　　　<script id="invoiceListDot" type="text/x-dot-template">

                {{? it.invoiceInfoDtos}}

                {{ for(var prop=;prop

                <it.invoiceInfoDtos.length

                        ; prop++){ }}

                <div class="{{ if(prop==0){}}invoice-infor {{ }else {}}no-invoice{{ }}}" data-index="{{= prop }}">

                    <span class="no-ivoice-icon"></span>

                    <span>普通发票</span>

                    <span class="ivo-margin">{{= it.invoiceInfoDtos[prop].content }}</span>

                    <span class="ivo-margin">{{= it.invoiceInfoDtos[prop].title }}</span>

                    <span class="ivo-margin">{{= it.invoiceInfoDtos[prop].address }}</span>

                    <span class="ivo-margin">{{= it.invoiceInfoDtos[prop].receiver }}</span>

                    <span class="ivo-margin">{{= it.invoiceInfoDtos[prop].phone }}</span>

                </div>

                {{ } }}

                {{?}}

            </script>

嵌套for循环的使用

（1）json数据结构：

var goods_list = {

        "list": [

            {

                "id": "",

                "name": "衣服",

                "goods": [

                    {

                        "goods_id": "",

                        "name": "衣服1",

                        "price": "",

                        "logoimg": "http://image.diandodo.com/zhudianbao/Uploads/User/u1250000222/20160723/201607231342158687.png@250h_250w_1e_1c"

                    },

                    {

                        "goods_id": "",

                        "name": "衣服2",

                        "price": "",

                        "logoimg": "http://image.diandodo.com/zhudianbao/Uploads/User/u1250000222/20160723/201607231342158687.png@250h_250w_1e_1c"

                    }

                ]

            },

            {

                "id": "",

                "name": "鞋子",

                "goods": [

                    {

                        "goods_id": "",

                        "name": "鞋子1",

                        "price": "",

                        "logoimg": "http://image.diandodo.com/zhudianbao/Uploads/User/u1250000222/20160723/201607231342158687.png@250h_250w_1e_1c"

                    },

                    {

                        "goods_id": "",

                        "name": "鞋子2",

                        "price": "",

                        "logoimg": "http://image.diandodo.com/zhudianbao/Uploads/User/u1250000222/20160723/201607231342158687.png@250h_250w_1e_1c"

                    }

                ]

            }

        ]

    };

（2）区域与页面的构建

    <div id="category-goods"></div>

    <!-- 必须加上type="text/x-dot-template" -->

    <script id="category-goods-tmpl" type="text/x-dot-template">

        {{ for(var i=, catlen=it.length; i<catlen; i++) { }}

            <div class="rxsp">

                <div class="aui-pull-left"><h3> {{= it[i].name }} </h3></div>

                <a class="aui-pull-right ">

                    查看更多

                    <span class="aui-iconfont aui-icon-right"></span>

                </a>

            </div>

            <div class="aui-list-item-inner">

                <div class="aui-row aui-row-padded">

                    {{ for(var j=, goodslen=it[i]['goods'].length; j<goodslen; j++) { }}

                    <div class="aui-col-xs-6">

                        <img src="{{= it[i]['goods'][j].logoimg }}" onclick="openWin('goods_detail')">

                        <p class="tit">{{= it[i]['goods'][j].name }} </p>

                        <div class="aui-info" style="padding-top:0">

                            <div class="aui-info-item">

                                <span class="red">￥{{= it[i]['goods'][j].price }}<!-- <span class="jifen"> 积分1000</span></span> -->

                            </div>

                        </div>

                    </div>

                    {{ } }}

                </div>

            </div>

        {{ } }}

    </script>

（3）绑定到容器

    var evalText = doT.template($("#category-goods-tmpl").text());

    $("#category-goods").html(evalText(goods));

宏的使用

<div class="content" id="serviceItem">

            {{##def.spaceUnit:

            {{? it.productPrice.policyInfo.storageUnit== }}K{{?? it.productPrice.policyInfo.storageUnit==}}M{{??

            it.productPrice.policyInfo.storageUnit==}}G {{?? }}T {{? }}

            #}}

            <div class="buy-list">

                <ul>

                    <li class="buy-name">购买时长：</li>

                    <li class="buy-select"><p>{{=it.productPrice.userPeriod}}个月</p></li>

                    <li class="buy-unit"></li>

                    <li class="buy-state">预计到期时间：{{=it.productPrice.endTime}}</li>

                </ul>

            </div>

            <div class="buy-list">

                <ul>

                    <li class="buy-name">用户数：</li>

                    <li class="buy-select"><input name="userCount" onkeypress="eventUtil.onlyNumberKeyPress(event)"

                                                  type="text"></li>

                    <li class="buy-unit">人</li>

                    <li class="buy-state">用户单价 {{=it.productPrice.normalPriceDto.userPeriodPrice}}元/人

                        {{? it.productPrice.policyInfoDto.periodUnit== }} 年{{??

                        it.productPrice.policyInfoDto.periodUnit==}}月{{??

                        it.productPrice.policyInfoDto.periodUnit==}}天 {{?? }}单位未知 {{? }}

                        <span class="warning">（目前只支持200人以内的团队）</span></li>

                </ul>

            </div>

            <div class="buy-list">

                <ul>

                    <li class="buy-name">扩容空间(所有)：</li>

                    <li class="buy-select"><input name="expansion_storage"

                                                  onkeypress="eventUtil.onlyNumberKeyPress(event)" type="text"></li>

                    <li class="buy-unit">{{#def.spaceUnit}}</li>

                    <li class="buy-state">空间单价 {{=it.productPrice.normalPriceDto.storagePrice}}元/

                        {{#def.spaceUnit}}

                    </li>

                </ul>

            </div>

        </div>

最常规用法{{=it.attr}}

数据源：{"name":"Jake","age":}

区域:<div id="interpolation"></div>

模板：

<script id="interpolationtmpl" type="text/x-dot-template">

 <div>Hi {{=it.name}}!</div>

 <div>{{=it.age || ''}}</div>

 </script>

调用方式：

var dataInter = {"name":"Jake","age":};

var interText = doT.template($("#interpolationtmpl").text());

$("#interpolation").html(interText(dataInter));

for evaluation for in 循环

格式：

{{ for var key in data { }}

{{= key }}

{{ } }}

数据源：{"name":"Jake","age":,"interests":["basketball","hockey","photography"],"contact":{"email":"jake@xyz.com","phone":""}}

区域：<div id="evaluation"></div>

模板：

<script id="evaluationtmpl" type="text/x-dot-template">

{{ for(var prop in it) { }}

<div>KEY:{{= prop }}---VALUE:{{= it[prop] }}</div>

{{ } }}

</script>

调用方式：

var dataEval = {"name":"Jake","age":,"interests":["basketball","hockey","photography"],"contact":{"email":"jake@xyz.com","phone":""}};

var evalText = doT.template($("#evaluationtmpl").text());

$("#evaluation").html(evalText(dataEval));

循环数组{{~}}

格式：

{{~data.array :value:index }}

 ...

 {{~}}

数据源:{"array":["banana","apple","orange"]}

区域：<div id="arrays"></div>

模板：

<script id="arraystmpl" type="text/x-dot-template">

 {{~it.array:value:index}}

 <div>{{= index+ }}{{= value }}!</div>

 {{~}}

</script>

调用方式：

var dataArr = {"array":["banana","apple","orange"]};

var arrText = doT.template($("#arraystmpl").text());

$("#arrays").html(arrText(dataArr));

条件渲染{{？}}{{？？}}，相当于原生的if else if

格式：

{{? }} if

 {{?? }} else if

 {{??}} else

数据源：{"name":"Jake","age":}

区域：<div id="condition"></div>

模板：

<script id="conditionstmpl" type="text/x-dot-template">

 {{? !it.name }}

 <div>Oh, I love your name, {{=it.name}}!</div>

 {{?? !it.age === }}

 <div>Guess nobody named you yet!</div>

 {{??}}

 You are {{=it.age}} and still dont have a name?

 {{?}}

 </script>

调用方式：

var dataEncode = {"uri":"http://bebedo.com/?keywords=Yoga","html":"<div style='background: #f00; height: 30px; line-height: 30px;'>html元素</div>"};

 var EncodeText = doT.template($("#encodetmpl").text());

 $("#encode").html(EncodeText(dataEncode));

编码渲染{{!}},主要是为了防止代码注入以保障安全，如传入一个HTML片段或js片段，它会以字符串的形式渲染

数据源：{"uri":"http://bebedo.com/?keywords=Yoga"}

格式：

 {{!it.uri}}

区域：<div id="encode"></div>

模板：

<script id="encodetmpl" type="text/x-dot-template">

 Visit {{!it.uri}} {{!it.html}}

 </script>

调用方式：

var dataEncode = {"uri":"http://bebedo.com/?keywords=Yoga","html":"<div style='background: #f00; height: 30px; line-height: 30px;'>html元素</div>"};

 var EncodeText = doT.template($("#encodetmpl").text());

 $("#encode").html(EncodeText(dataEncode));

支持共用模块定义{{##def.}}定义，{{#def.}}引用模块

数据源：{"name":"Jake","age":}

区域：<div id="part"></div>

模板：

<script id="parttmpl" type="text/x-dot-template">

 {{##def.snippet:

 <div>{{=it.name}}</div>{{#def.joke}}

 #}}

 {{#def.snippet}}

 {{=it.html}}

 </script>

调用方式：

var dataPart = {"name":"Jake","age":,"html":"<div style='background: #f00; height: 30px; line-height: 30px;'>html元素</div>"};

 var defPart = {"joke":"<div>{{=it.name}} who?</div>"};

 var partText = doT.template($("#parttmpl").text(), undefined, defPart);

 $("#part").html(partText(dataPart));
//个人用例

    window.onload = function () {

        dotFunc = doT.template(document.getElementById("tmpl").innerHTML);

        /*dotFunc = doT.template($("#tmpl").text()); //与上行等同*/

        /*console.log('dotFunc', dotFunc);*/

        /*printOrders("[{SerialNumber:'01234567891'}]");*/

       /* printOrders("[{SerialNumber:'01234567891',SendTime:'2016-11-18 12:00:22',Consignee:'小店店长',ConsigneeTel:'18702111777',ConsigneeAddress:'玄武区苏宁大道1号预约1116002',OrderPartnerNo:'yg1010',AmountMoney:8888.12,Amount:1111,OrderDetails:[{MainCommodityName:'家佳康精装冰鲜肋排500g',Amount:8,Price:1111,AmountMoney:8888},{MainCommodityName:'家佳康精装冰鲜肋排800g',Amount:9,Price:111.11,AmountMoney:999.99}]}]");

    }*/

    function printOrders(ordersJSON) {

        try {

            var orders = eval(ordersJSON);

            if (orders.length && orders.length > ) {

                $("#container").html(dotFunc({orders: orders}));

                $(".barcode").each(function (index, element) {

                    $(this).empty().barcode(orders[index].SerialNumber, barcodeType, barcodeSettings)

                });

            }

            return orders.length > ;

        } catch (e) {

            return false;

        }

    }

参考文摘：

http://jinlong.github.io/doT/

http://olado.github.io/doT/index.html

http://www.mamicode.com/info-detail-874833.html

http://www.cnblogs.com/kuikui/p/3505768.html

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