获取选择列表框中所选项目的索引(Get index of selected item in a select listbox)

获取选择列表框中所选项目的索引(Get index of selected item in a select listbox) <select ng-click="getIndex($index)" size="14" ng-model="playlist.fileSelected" ng-options="saveFile for saveFile in playlist.playlist"></select>

$ index表示未定义。 如何获取选择列表框的索引？

<select ng-click="getIndex($index)" size="14" ng-model="playlist.fileSelected" ng-options="saveFile for saveFile in playlist.playlist"></select>

$index comes out as undefined. How can i get the index of the select listbox?

最满意答案

这很有效。

归功于这个问题的答案。 AngularJS - 在ng-options中使用$ index

还有一个解释为什么$index不适用于ng-options。

<select ng-click="getIndex(saveFile)" size="14" ng-model="saveFile" ng-options="index as saveFile for (index, saveFile) in playlist.playlist"></select>

This works.

Credit goes to the answers for this question. AngularJS - Using $index in ng-options

There's also an explanation on why $index doesn't work with ng-options.

<select ng-click="getIndex(saveFile)" size="14" ng-model="saveFile" ng-options="index as saveFile for (index, saveFile) in playlist.playlist"></select>