[solved]QML component: Cannot assign multiple values to a singular property

[kahon]

Anybody knows what does this sentence mean? Because when I use the next component, my application don't execute at all.
It crash here
@
import QtQuick 1.0
import "../commons/fakeSymbianComponents"
import ".."
import "../commons/jsonpath-0.8.0.js" as JsonPath
Page {
id: root
property variant data

property bool m_json_debug: true
property variant dates
function getDates(){
    return JsonPath.jsonPath(data,"$..prediccion[*].fecha")
}

property string name_window: "> CityDetail :"

function gDebug(str,section){
    var display = m_debug
    if(section!=undefined)
        display = section && m_debug
    if (display)
        console.log(name_window + str)
}

CommonHeader{ // here- <-------------------------------------------------------------------------
    section: qsTr("MI CIUDAD")
    z:100
}

Text{
    id:textDate
    anchors.centerIn: parent
}

onDataChanged: {
    dates = getDates()
    gDebug("DATA CHANGED:" +data)
    gDebug("FECHA:" +  getDates()[0])
}

}
@

The CommonHeader component is:

@
import QtQuick 1.0
import "commons"
Item {
id: root
property string section:""
property variant lineColor: "#96D7FF"
property bool searchActive: true
width: if(parent)parent.width
height: infoSection.height+rectSearch.height
signal search(string filter);
Rectangle {
id: infoSection
anchors.top:parent.top
height: 30
width: parent.width
color:"#494A4B"
Text{
id: textSection
text:section
anchors.verticalCenter: parent.verticalCenter
anchors.left: parent.left
anchors.leftMargin: 12
font.pixelSize: 18
color: "white"
}
Image {
id: logo
source: "images/logo.png"
anchors.right: parent.right
anchors.verticalCenter: parent.verticalCenter
anchors.rightMargin: 10
}
Rectangle {
id: lineUp
height: 1
width: parent.width
color:lineColor
anchors.top:parent.top
}
Rectangle {
id: lineDown
height: 1
width: parent.width
color:lineColor
anchors.bottom:parent.bottom
}
}
RectSearch {
id:rectSearch
anchors.top: infoSection.bottom
width: parent.width
visible: searchActive
height: if(searchActive)50
else 0

}
Component.onCompleted: {
    rectSearch.search.connect(root.search)
}

}
@

the RectSearch component is:

@
import QtQuick 1.0
import "../commons"

Rectangle{
signal search(string filter);
height: backSearch.sourceSize.height; width: 360
z:10
gradient: Gradient { GradientStop {color:"#494A4B";position:0}GradientStop {color:"#2E2E2F";position:1}}
Rectangle{
id:backSearch
anchors.verticalCenter: parent.verticalCenter
FormItem{
id:tfNews
radius: 15
color:"white"
anchors.left: parent.left
anchors.verticalCenter: parent.verticalCenter
anchors.leftMargin: 6
width: 290
height: 30
}

    Button{
        id: searchButton
        anchors.left: tfNews.right
        anchors.verticalCenter: parent.verticalCenter
        sInactiveSource: "../images/button_search_off.png"
        sActiveSource: "../images/button_search_on.png"
        text:"Buscar"
        anchors.leftMargin: 12
        onButtonClicked: {
            search(tfNews.getText())
        }
    }
}

}
@

any idea why is it happening? I have no idea really.

Thanks for your help!
Fernando Moreno Ruiz.

[chriadam]

Can you paste the full error, including line number and column information?

I haven't looked closely at the issue, but it could be any number of things:

QML types defined in C++ can have a "default property" -- that is, the property that a value is assigned to, if no property name is given.

One prominent example of such a default property is the "children" property of the Item type.
You can do:

@
Item {
id: root

Item {
    id: child1
}

Item {
    id: child2
}

}
@

and this is identical to

@
Item {
id: root

children: [
    Item {
        id: child1
    },
    Item {
        id: child2
    }
]

}
@

Now it's possible that the Page component has a default property which is a singular Item, and thus attempting to assign both a CommonHeader and a Text element (ie, an array of Items) to that singular Item property, is causing a problem.

Alternatively, there may be a property list<someType> property somewhere, which is being assigned or bound to another property, somewhere, which could also cause this error.

Cheers,
Chris.

[kahon]

Hi Chris,
Thank you too much because of your reply. I did solve this typing:
@
children:[
Text{
id:textDate
anchors.centerIn: parent
},

    CommonHeader{
        searchActive: false
        section: qsTr("MI CIUDAD")
        z:100
    }
]

@
instance of doing by default property. I don't know why it solved the problem. But I understood that you told me almost everything. I'm not sure from where it is accessing to the component. But doing explicit code, it doesn't happen.

Best,
Fernando.