always tips "Expected token :"

[nicker player]

When I used the code below.it always occured that "expected token :"(heres the onCompleted :)
I dont know why.how to solve this.

Component.onCompleted:{
        sendMsg.connect(msgProxy.onSendMsg)
}

[J.Hilk]

@nicker-player
you give very little information, for example what is sendMsg ?

assuming the following:

Item {
    id: root
    // Assuming sendMsg is a signal and msgProxy is an object with a slot onSendMsg
    signal sendMsg(string message)

    Component.onCompleted: {
        root.sendMsg.connect(msgProxy.onSendMsg)
    }

    // Example of emitting the signal
    function triggerSendMsg() {
        sendMsg("Hello, World!")
    }
}

than it should work just fine, maybe there's a typo somewhere above the onCompleted?

btw, more commonly used is this approach:

Item {
    id: root
    // Assuming sendMsg is a signal and msgProxy is an object with a slot onSendMsg
    signal sendMsg(string message)

    // Define the signal handler directly
    onSendMsg: {
        msgProxy.onSendMsg(message)
    }
}

[nicker player]

@J-Hilk
I think it may be the space problem.
When I added the space after the part of the "Component.onCompleted:" ,the error seemed disappeared.So is it possible that the space caused the problem?

[J.Hilk]

space is usually irrelevant, especially behind an assignment :