Adding image between string

Question

How to add a image between two string.
example
Test string one <IMG> testing string two

Answer 1

An empty loop to wait for something is to avoid in all languages! At worst, put a sleep call in the loop. But a better idiom for JavaFX would be:
function ChangeImage(image: Image): Void
    fadeOut.action = function()
        selectedImage = Image
            url: fileURL;
            height: 400, preserveRatio: true
            backgroundLoading: true
        var progress = bind selectedImage.progress on replace
            if (progress == 100)
                fadeIn.playFromStart();
    fadeOut.playFromStart();
}(untested)
First, I create the Image when needed, to start the background loading. Or maybe the loading is very long and you prefer to start earlier, so your version is fine in this case.
Second, I do what I described, binding to the progress variable of selectedImage, and watching the updates. And when we reach the wanted value, we start the second animation.