模板引擎doT.js介绍及如何判断对象为空、如何嵌套循环···

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:    /{{([sS]+?)}}/g,
  interpolate: /{{=([sS]+?)}}/g,
  encode:      /{{!([sS]+?)}}/g,
  use:         /{{#([sS]+?)}}/g,
  define:      /{{##s*([w.$]+)s*(:|=)([sS]+?)#}}/g,
  conditional: /{{?(?)?s*([sS]*?)s*}}/g,
  iterate:     /{{~s*(?:}}|([sS]+?)s*:s*([w$]+)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=0;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": "1",
                "name": "衣服",
                "goods": [
                    {
                        "goods_id": "1",
                        "name": "衣服1",
                        "price": "100",
                        "logoimg": "http://image.diandodo.com/zhudianbao/Uploads/User/u1250000222/20160723/201607231342158687.png@250h_250w_1e_1c"
                    },
                    {
                        "goods_id": "2",
                        "name": "衣服2",
                        "price": "200",
                        "logoimg": "http://image.diandodo.com/zhudianbao/Uploads/User/u1250000222/20160723/201607231342158687.png@250h_250w_1e_1c"
                    }
                ]
            },
            {
                "id": "2",
                "name": "鞋子",
                "goods": [
                    {
                        "goods_id": "3",
                        "name": "鞋子1",
                        "price": "100",
                        "logoimg": "http://image.diandodo.com/zhudianbao/Uploads/User/u1250000222/20160723/201607231342158687.png@250h_250w_1e_1c"
                    },
                    {
                        "goods_id": "4",
                        "name": "鞋子2",
                        "price": "200",
                        "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=0, 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=0, 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==1 }}K{{?? it.productPrice.policyInfo.storageUnit==2}}M{{??
            it.productPrice.policyInfo.storageUnit==3}}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==1 }} 年{{??
                        it.productPrice.policyInfoDto.periodUnit==2}}月{{??
                        it.productPrice.policyInfoDto.periodUnit==3}}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":31}
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":31};
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":31,"interests":["basketball","hockey","photography"],"contact":{"email":"jake@xyz.com","phone":"999999999"}}

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":31,"interests":["basketball","hockey","photography"],"contact":{"email":"jake@xyz.com","phone":"999999999"}};
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+1 }}{{= 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":31}
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 === 0}}
 <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":31}
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":31,"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 > 0) {
                $("#container").html(dotFunc({orders: orders}));
                $(".barcode").each(function (index, element) {
                    $(this).empty().barcode(orders[index].SerialNumber, barcodeType, barcodeSettings)
                });
            }
            return orders.length > 0;
        } 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