xml - What is the syntax to properly use a variable in a Qt Qml XmlLIstModel query - 


import qtquick 2.0 import qtquick.xmllistmodel 2.0  xmllistmodel {     id: ios_elementsmodel     source: "/testcode/positionersandrepeaters/positionersandrepeaters/menuitems.xml"     query: "/menuitems/menuitem"      xmlrole { name: "id"; query: "id/number()" }     xmlrole { name: "type"; query: "type/string()" }     xmlrole { name: "index"; query: "index/string()" }     xmlrole { name: "verbage"; query: "verbage/string()" }     xmlrole { name: "parentpageid"; query: "parentpageid/number()" }     xmlrole { name: "destinationpageid"; query: "destinationpageid/number()" }

}

i using qt qml (qt quick) xmllistmodel defined above.

i have tested above code , returns of items in xml file.

i use variable filter items. such parentpageid = $myselectedpage. how do this?

the problem xmllistmodel exists represent source xml. if want have filtered list have 3 obvious options can see. first have component presents listmodel determine elements show/hide(show/hide delegate based on criteria). secondly, generate new listmodel xmllistmodel contains elements want(this can done in javascript signifigantly faster if done in c++). thirdly, have c++ layer provide initial listmodel , perform filtering when building listmodel used in qml.

if worried memory , or processing time highly recommend option 2/3 logic done in c++.

as requested, details on creating listmodel js. need have existing listmodel already. either having created 1 in advance in qml file or using dynamic qml object creation generate new one. use api found http://qt-project.org/doc/qt-4.8/qml-listmodel.html , append in elements want.

after reading comment realized filtering based on pages! @ point think best option share listmodel across components , have view determine elements show


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