jquery tmpl 詳解

weixin_34321977發表於2016-04-28

原文:jquery tmpl 詳解

動態請求資料來更新頁面是現在非常常用的方法,比如部落格評論的分頁動態載入,微博的滾動載入和定時請求載入等。

 

這些情況下,動態請求返回的資料一般不是已拼好的 HTML 就是 JSON 或 XML,總之不在瀏覽器端拼資料就在伺服器端拼資料。不過,從傳輸量方面來看,返回 HTML 不划算,而在 web 傳輸方面,現在更多的是使用 JSON 而不是 XML。

瀏覽器端根據 JSON 生成 HTML 有個很苦惱的地方就是,結構不復雜的時候還好,結構一複雜,就想死了,需要很小心很小心地寫出幾乎無法維護的 JavaScript 程式碼。

因此一些用模版生成HTML的的框架相繼出現jquery.tmpl 就是其中的一種,下面我們來詳細介紹下jquery.tmpl的用法

jquery.tmpl的幾種常用標籤分別有:

${}{{each}}{{if}}{{else}}{{html}}

不常用標籤

 {{=}},{{tmpl}} and {{wrap}}.

${}等同與{{=}}是輸出變數 ${}裡面還可以放表示式 (=和變數之間一定要有空格,否則無效

示例:

<div id="div_demo">
</div>
<script id="demo" type="text/x-jquery-tmpl">
    <div style="margin-bottom:10px;">
      <span>${ID}</span>
      <span style="margin-left:10px;">{{= Name}}</span>
      <span style="margin-left:10px;">${Number(Num)+1}</span>
      <span style="margin-left:10px;">${Status}</span>
    </div>
</script>
<script type="text/javascript">
  var users = [{ ID: 'think8848', Name: 'Joseph Chan', Num: '1', Status: 1 }, { ID: 'aCloud', Name: 'Mary Cheung', Num: '2'}];
  $("#demo").tmpl(users).appendTo('#div_demo');
</script>

 

 

{{each}} 提供迴圈邏輯,$value訪問迭代變數 也可以自定義迭代變數(i,value)

示例:

<div id="div_each">
</div>
<script id="each" type="text/x-jquery-tmpl"> 
    <h3>users</h3>
    {{each(i,user) users}}
        <div>${i+1}:{{= user.name}}</div>
        {{if i==0}}
            <h4>group</h4>
            {{each(j,group) groups}}
                <div>${group.name}</div>
            {{/each}}
        {{/if}}
    {{/each}}
    <h3>depart</h3>
    {{each departs}}
        <div>{{= $value.name}}</div>
    {{/each}}
</script> 
<script type="text/javascript">
  var eachData = { users: [{ name: 'jerry' }, { name: 'john'}], groups: [{ name: 'mingdao' }, { name: 'meihua' }, { name: 'test'}], departs: [{ name: 'IT'}] };
  $("#each").tmpl(eachData).appendTo('#div_each');
</script>

 

{{if }} {{else}}提供了分支邏輯 {{else}} 相當於else if

示例:

 

<div id="div_ifelse"></div>
<script id="ifelse" type="text/x-jquery-tmpl"> 
    <div style="margin-bottom:10px;"><span>${ID}</span><span style="margin-left:10px;">{{= Name}}</span>
        {{if Status}}
            <span>Status${Status}</span>
        {{else App}}
            <span>App${App}</span>
        {{else}}
            <span>None</span>
        {{/if}}
    </div>
</script> 
<script type="text/javascript">
  var users = [{ ID: 'think8848', Name: 'Joseph Chan', Status: 1, App: 0 }, { ID: 'aCloud', Name: 'Mary Cheung', App: 1 }, { ID: 'bMingdao', Name: 'Jerry Jin'}];
    $("#ifelse").tmpl(users).appendTo('#div_ifelse');
</script>

 

{{html}} 輸出變數html,但是沒有html編碼,適合輸出html程式碼

 例項

<div id="div_html"></div>
<script id="html" type="text/x-jquery-tmpl"> 
    <div style="margin-bottom:10px;">
    <
span>${ID}</span>
    <span style="margin-left:10px;">{{= Name}}<
/span>   ${html}   {{html html}} </div> </script> <script type="text/javascript">   var user = { ID: 'think8848', Name: 'Joseph Chan', html: '<button>html</button>' };  $("#html").tmpl(user).appendTo('#div_html'); </script>

 

{{tmpl}} 巢狀模版

例項

<div id="tmpl"></div>
<script id="tmpl1" type="text/x-jquery-tmpl">
    <div style="margin-bottom:10px;">
      <span>${ID}</span>
      <span style="margin-left:10px;">{{tmpl($data) '#tmpl2'}}</span>
    </div>     
</script>
<script id="tmpl2" type="type/x-jquery-tmpl">
    {{each Name}}${$value}  {{/each}}   
</script>
<script type="text/javascript">
  var users = [{ ID: 'think8848', Name: ['Joseph', 'Chan'] }, { ID: 'aCloud', Name: ['Mary', 'Cheung']}];
   $("#tmpl1").tmpl(users).appendTo('#tmpl');
</script>

 

{{wrap}},包裝器

例項

 

<div id="wrapDemo">
    </div>
<script id="myTmpl" type="text/x-jquery-tmpl">
    The following wraps and reorders some HTML content:
    {{wrap "#tableWrapper"}}
        <h3>One</h3>
        <div>
            First <b>content</b>
        </div>
        <h3>Two</h3>
        <div>
            And <em>more</em> <b>content</b>...
        </div>
    {{/wrap}}
    </script>
<script id="tableWrapper" type="text/x-jquery-tmpl">
    <table cellspacing="0" cellpadding="3" border="1"><tbody>
        <tr>
            {{each $item.html("h3", true)}}
                <td>
                    ${$value}
                </td>
            {{/each}}
        </tr>
        <tr>
            {{each $item.html("div")}}
                <td>
                    {{html $value}}
                </td>
            {{/each}}
        </tr>
    </tbody></table>
    </script>
 <script type="text/javascript">
        $(function () {
            $('#myTmpl').tmpl().appendTo('#wrapDemo');
        });
    </script>

 

 

 

$data $item $item代表當前的模板;$data代表當前的資料。

 

 例項:

<div id="div_item_data"></div>
<script id="item_data" type="text/x-jquery-tmpl"> 
     <div style="margin-bottom:10px;">
    <
span>${$data.ID}</span>
    <span style="margin-left:10px;">${$item.getName(" ")}<
/span>
   <
/div> </script> <script type="text/javascript">   var users = [{ ID: 'think8848', Name: ['Joseph', 'Chan'] }, { ID: 'aCloud', Name: ['Mary', 'Cheung']}]; $("#item_data").tmpl(users, { getName: function (spr) { return this.data.Name.join(spr); } }).appendTo('#div_item_data'); </script>

 

 $.tmplItem()方法,使用這個方法,可以獲取從render出來的元素上重新獲取$item

例項

<script type="text/javascript">
  $('#demo').delegate('div', 'click', function () {
                var item = $.tmplItem(this);
                alert(item.data.Name);
            });
</script>

 

how to tell if a property exists and is false

{{if Value}}
    Value exists and is true
{{else typeof(Value) != "undefined" && Value === false}}
    Value exists and is false
{{else}}
    Value doesn't exist or isn't explicitly false
{{/if}}

獲取索引:

$("#templateToRender").tmpl(jsonData,
  {
    getIndex: function (item) {
      return $.inArray(item, jsonData);
    }
  });
 
<script id="templateToRender" type="text/x-jquery-tmpl">
  <li>
    索引: ${$item.getIndex($item.data)}
  </li>
</script>
 

 

 

 

 

 

 

 

 

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