本文介绍了有条件加入在NG-重复块元素的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

是否有可能的东西添加到基于状态的标记?
就像这个例子,当我想补充 D 仅在第一次迭代(仅适用于 myData的的第一个元素)?

 < TR NG重复=米myData的>
   &所述; TD> {{m.Name}}&下; / TD>
   &所述; TD> {{m.LastName}}&下; / TD>   @if myData.indexOf(M)= 0,那么//类似的东西
   < TD ROWSPAN ={{m.length}}>
      < UL>
        <李NG重复=d在天>
           {{d.hours}}
        < /李>
      < / UL>
   < / TD>
< / TR>


解决方案

是的,AngularJS有2个用于指示这个场合:


  • 秀 /的家族可用于隐藏(用
    使用基于的结果显示CSS规则)DOM的三个部分
    评估一个前pression。

  • 如果我们想物理删除/添加DOM部分有条件
    家庭指令(NG-开关,NG-开关时,
    NG-开关默认)会来得心应手。

在一天结束时这两种解决方案将给予同样的视觉效果,但底层DOM结构会有所不同。对于简单的用例NG-显示/ NG隐藏可能是好的,但较大的DOM的部分应与NG-开关进行治疗。

有关此问题的使用案例我会建议使用纳克开关。

Is it possible to add stuff to the markup based on condition?Like in this example, when I want to add td only on the first iteration (only for the first element of myData)?

<tr ng-repeat="m in myData">
   <td>{{m.Name}}</td>
   <td>{{m.LastName}}</td>

   @if myData.indexOf(m) = 0 then // something like that
   <td rowspan ="{{m.length}}">
      <ul>
        <li ng-repeat="d in days">
           {{d.hours}}
        </li>
      </ul>
   </td>
</tr>
解决方案

Yes, AngularJS has 2 directives for this occasion:

  • The ng-show / ng-hide family of directives can be used to hide (byusing display CSS rules) parts of the DOM three based on a result ofevaluating an expression.
  • If we want to physically remove / add parts of the DOM conditionallythe family of ng-switch directives (ng-switch, ng-switch-when,ng-switch-default) will come handy.

At the end of the day both solutions will give the same visual effect but the underlying DOM structure will be different. For simple use cases ng-show / ng-hide is probably OK, but larger portions of the DOM should be treated with ng-switch.

For the use case from this question I would advice using ng-switch.

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08-03 17:08