highlight feature from feature id in qgis

by vaibhav Dhiman   Last Updated April 26, 2017 09:22 AM

i am making a qgis plugin and want to highlight a feature from feature id but the feature id must be taken from the textbox my code is below but this shows error like

it = cLayer.getFeatures(QgsFeatureRequest(expr))
AttributeError: 'NoneType' object has no attribute 'getFeatures'

    inputid = self.dlg.lineEdit.text()
    cLayer = self.iface.mapCanvas().currentLayer()
    expr = QgsExpression( "\"ID\"= 54")
    it = cLayer.getFeatures(QgsFeatureRequest(expr))
    ids = [i.id() for i in it]
    if i['ID'] == inputid:

Thanks in advance

Answers 1

It seems that QGIS doesn't recognize the layer.

The line:

cLayer = self.iface.mapCanvas().currentLayer()

returns a QgsVectorLayer() object only if it is currently selected in the Layers Panel. Otherwise, a None is returned and the error you encountered.

I don't know the source of the input layer, but a general method for loading it would be:

cLayer = QgsVectorLayer('path to the vector layer', 'display name', 'ogr')
April 26, 2017 10:37 AM

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