Angualarjs smart table search particular columns - angularjs

Question

i have used this documentation smart table
<form>
<label for="predicate">selected predicate:</label>
<select class="form-control" id="predicate" ng-model="selectedPredicate" ng-options="predicate for predicate in predicates"></select>
</form>
<table st-table="rowCollection" class="table table-striped">
<thead>
<tr>
<th st-sort="firstName">first name</th>
<th st-sort="lastName">last name</th>
<th st-sort="birthDate">birth date</th>
<th st-sort="balance">balance</th>
<th>email</th>
</tr>
<tr>
<th>
<input st-search="{{firstName}},{{lastName}}" placeholder="search for firstname" class="input-sm form-control" type="search"/>
</th>
<th colspan="3">
<input st-search placeholder="global search" class="input-sm form-control" type="search"/>
</th>
<th>
<input st-search="{{selectedPredicate}}" placeholder="bound predicate" class="input-sm form-control" type="search"/>
</th>
</tr>
</thead>
<tbody>
<tr ng-repeat="row in rowCollection">
<td>{{row.firstName | uppercase}}</td>
<td>{{row.lastName}}</td>
<td>{{row.birthDate | date}}</td>
<td>{{row.balance | currency}}</td>
<td><a ng-href="mailto:{{row.email}}">email</a></td>
</tr>
</tbody>
</table>
i have used st-search search for particular column . it is working fine but two column not working. can you help me? i need search two column only

Answer 1

There is apparently no way to achieve this directly with the built smart-table.
You can use a directive like suggested here :
AngularJS smart-table search within multiple columns

Answer 2

I have another idea for others who have the same problem:
If your data rowCollection is not too big,
in the javascript in the init() of the page do something like:
self.rowCollection.forEach(function (element) {
element.NameForFilter = element.firstName+ ' ' + element.lastName;
});
and then in the input of the th:
st-search=NameForFilter