alerts.qml Example File

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 import Qt 4.7
 import QtWebKit 1.0

 WebView {
     id: webView
     width: 200
     height: 150
     url: "alerts.html"

     onAlert: popup.show(message)

     Rectangle {
         id: popup

         color: "red"
         border.color: "black"; border.width: 2
         radius: 4

         y: parent.height // off "screen"
         anchors.horizontalCenter: parent.horizontalCenter
         width: label.width + 5
         height: label.height + 5

         opacity: 0

         function show(text) {
             label.text = text
             popup.state = "visible"
             timer.start()
         }
         states: State {
             name: "visible"
             PropertyChanges { target: popup; opacity: 1 }
             PropertyChanges { target: popup; y: (webView.height-popup.height)/2 }
         }

         transitions: [
             Transition { from: ""; PropertyAnimation { properties: "opacity,y"; duration: 65 } },
             Transition { from: "visible"; PropertyAnimation { properties: "opacity,y"; duration: 500 } }
         ]

         Timer {
             id: timer
             interval: 1000

             onTriggered: popup.state = ""
         }

         Text {
             id: label
             anchors.centerIn: parent
             width: webView.width  *0.75

             color: "white"
             font.pixelSize: 20
             wrapMode: Text.WordWrap
             horizontalAlignment: Text.AlignHCenter
             smooth: true
         }
     }
 }