Display the value only if the current value in the loop is not same as the previous value in jsp using ng- repeat - angularjs

Question

I am using ng-repeat in my jsp to loop and display the values.if i have the value more then one time in the list i need to display only once.
Display the value only if the current value in the loop is not same as the previous value in jsp using ng- repeat
please find my code:
<td>
// obj.vm is name. name should be displayed only if it is diferrent then the previous name. otherwise it should be blank
<div obj.vm> </div>
</td>
// obj.dm is value. all the values should be displayed
<td> <div obj.dm> </div>
</td>
</tr>
<tr ng-repeat="obj in selItem.surveyRefData">
<td nowrap> // need to display ob.vm only if the current value is not same as previous value
<div style="float: left;" class="form-actions" obj.vm">
</div>
</td>
<td>
<div style="float: left;" class="form-actions"
ng-bind-html="(!validSeriesIdReqPending ?(obj.dm | seriesText):'')">
</div>
<br/>
<br/>
<tr ng-repeat="obj in selItem.surveyRefData|unique: obj">
<td> // obj.vm is name. name should be displayed only if it is diferrent then the previous name. otherwise it should be blank
<div obj.vm>
</div> </td> // obj.dm is value. all the values should be displayed
<td>
<div obj.dm> </div>
</td>
</tr>

Answer 1

The ideal solution is to preprocess the data and group it by the vm attribute, so you would have some structure like this:
name1
value1
value2
value3
name2
value4
value5
name3
value5
...
Then you would have a nested ng-repeat that loops over the values within each name. If, for some reason, you can't preprocess the data, you can refer to the previous item in your ng-repeat using the $index variable. Here is a simple example:
<tr ng-repeat="obj in selItem.surveyRefData">
<td>{{obj.vm !== selItem.surveyRefData[$index-1].vm ? obj.vm : ''}}</td>
<td>{{obj.dm}}</td>
</tr>
Keep in mind that this will only work if your data is ordered based on the vm attribute... if you had name1 -> name1 -> name2 -> name1, for example, you would see name1 twice in your output table.
Here is a simple example plunker: https://plnkr.co/edit/r5yxYk4Rr7mXaBeqoJNs