前角pression内增量 [英] Increment inside angular expression

问题描述

我试图表现出一定的 DIV S（这是3+ NG-重复是S）和有条件然后增加一个计数器变量，。计数器有助于其决定的div的可见性的条件。

I am trying to show some divs (which are under 3+ ng-repeats) conditionally and then increment a counter variable which. The counter contributes in the conditions which decide the visibility of divs.

当我做同样的事情到 NG-秀='富++＆LT; SOME_LIMIT我得到一个语法错误：

When I do something similar tong-show='foo++ < SOME_LIMIT' I get a syntax error:

Error: Syntax Error: Token 'undefined' not a primary expression at column NaN of the expression [moveItem.type != 'account' && team.rowCount++] starting at [moveItem.type != 'account' && team.rowCount++].

或

Error: Syntax Error: Token '2' is an unexpected token at column 42 of the expression [team.expandAccounts || team.rowCount++ < 2] starting at [2]

给code似乎并没有要求，但仍我给什么我尝试。
我想类似的东西：

Giving the code doesn't seem to be required but still I am giving what I was trying. I tried something similar to:

<div ng-repeat='request in pagedRequests'
  <tr ng-repeat='(fooId, foo) in returnFoos(request)'>
    <td ng-init='foo.rowCount = 0'>
      {{foo.someAttribute}}
      <!--Here is just an icon shown when the rowCount reaches some limit, say 3.
          Uses ng-switch on foo.rowCount. Skipping this as this doesn't seem
          problematic. This toggles rows' collapsing using foo.expandRows.-->
      <div ng-repeat='bar in foo.bars'
           ng-show='foo.rowCount < 3 || foo.expandRows'>
        <span ng-show='bar.type=="multiRowBar"'
              ng-repeat='row in bar.rows'>
          <span ng-show="foo.expandRows || foo.rowCount++ < 3"> <!--SYNTAX ERROR!-->
            <!--Showing the nested objects with more ng-repeats.-->
        </span>
        <span ng-show='bar.type!="multiRowBar" && foo.rowCount++<3'>  <!--SYNTAX ERROR!-->
          <!-- This adds a single row per bar of this type.-->
        </span>
      </div>
    </td>
  </tr>
</div>

难道我们不能使用POST / pre递增/递减运算符（如 ++ ）内角前pressions？

Is it that we can't use post/pre increment/decrement operators (like ++) inside angular expressions?

推荐答案

现在的问题是有点无知，这样的努力会触发循环 $消化电话打破了事实。 （只是作出一些感觉出这个问题，我给我的解决方案中的缘故。希望这将有助于有人试图这东西）的解决方案，我最终确定参与压扁所有列表到一个列表，开关 ING显示图标 $指数。

The question is a bit ignorant to the fact that such an effort triggers cyclic $digest calls which breaks. (Just for the sake of making some sense out of this question I'm giving my solution. Hope it will help someone trying this stuff) The solution I finalized involved flattening all the lists to a single list and switching to show the icon for a particular value of $index.

这篇关于前角pression内增量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！