How to determine the visibility li's in a scrollable ul

How to determine the visibility li's in a scrollable ul

By : kostas
Date : November 24 2020, 01:01 AM
it should still fix some issue You could use the elements scrollTop and scrollHeight properties, and if your
  • elements have fixed heights, you could calculate which are visible.
    code :
    scrollTop / liHeight === numberOfOverTheFold
    (scrollHeight - scrollTop) / liHeigth === numberOfVisible

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    c#: How do I determine if the ScrollBar for a Scrollable control is currently displayed?

    c#: How do I determine if the ScrollBar for a Scrollable control is currently displayed?

    By : dralaalbazzaz
    Date : March 29 2020, 07:55 AM
    it should still fix some issue For controls with the AutoScroll property try the HorizontalScroll and VerticalScroll Visible properties:
    code :
    // Checks horizontal scrollbar visibity.
    // Checks horizontal scrollbar visibity.
    How to determine visibility in 2D

    How to determine visibility in 2D

    By : Abulooz
    Date : March 29 2020, 07:55 AM
    To fix the issue you can do If you're using simple shapes to block the entity's view, there is an easy way to do this that I have implemented:
    Create a VisionWave object which can move either horizontally or vertically. You can define a VisionWave using a source coordinate, two lines that intersect that point, and a distance from the source point.
    code :
      \     /
       \   />
        \ / >
         @  >
        / \ >
       /   \>
      /     \
    How to determine which lines are visible in scrollable JTextArea?

    How to determine which lines are visible in scrollable JTextArea?

    By : Andrew Williams
    Date : March 29 2020, 07:55 AM
    Any of those help How to determine number of the first visible line and the number of lines currently visible in scrollable JTextArea (JTextArea inside a JScrollPane)? , Okay, this is my take on the problem... (Nice question though)
    code :
    public class TestTextArea {
        public static void main(String[] args) {
            new TestTextArea();
        public TestTextArea() {
            EventQueue.invokeLater(new Runnable() {
                public void run() {
                    try {
                    } catch (ClassNotFoundException ex) {
                    } catch (InstantiationException ex) {
                    } catch (IllegalAccessException ex) {
                    } catch (UnsupportedLookAndFeelException ex) {
                    JFrame frame = new JFrame();
                    frame.setLayout(new BorderLayout());
                    frame.add(new TestTextAreaPane());
        public class TestTextAreaPane extends JPanel {
            private JTextArea textArea;
            private JTextArea viewText;
            public TestTextAreaPane() {
                setLayout(new GridLayout(2, 1));
                textArea = new JTextArea(20, 100);
                viewText = new JTextArea(20, 100);
                JScrollPane scrollPane = new JScrollPane(textArea);
                scrollPane.getViewport().addChangeListener(new ChangeListener() {
                    public void stateChanged(ChangeEvent e) {
                        if (textArea.getText().length() > 0) {
                            JViewport viewport = (JViewport) e.getSource();
                            Rectangle viewRect = viewport.getViewRect();
                            Point p = viewRect.getLocation();
                            int startIndex = textArea.viewToModel(p);
                            p.x += viewRect.width;
                            p.y += viewRect.height;
                            int endIndex = textArea.viewToModel(p);
                            if (endIndex - startIndex >= 0) {
                                try {
                                    viewText.setText(textArea.getText(startIndex, (endIndex - startIndex)));
                                } catch (BadLocationException ex) {
            protected String loadText() {
                String text = null;
                File file = new File("src/testtextarea/TestTextArea.java");
                BufferedReader br = null;
                try {
                    br = new BufferedReader(new FileReader(file));
                    StringBuilder sb = new StringBuilder(128);
                    String read = null;
                    while ((read = br.readLine()) != null) {
                    text = sb.toString();
                } catch (IOException exp) {
                } finally {
                    try {
                    } catch (Exception e) {
                return text;
    Accurately determine if element is scrollable

    Accurately determine if element is scrollable

    By : user3565983
    Date : March 29 2020, 07:55 AM
    With these it helps Do you want to know if an element can ever scroll or can currently scroll?
    Can an element ever scroll?
    code :
    e.css('overflow-y') == 'scroll' || e.css('overflow-y') == 'auto'
    How to determine with vanilla javascript that a <div> is scrollable?

    How to determine with vanilla javascript that a <div> is scrollable?

    By : user3422041
    Date : March 29 2020, 07:55 AM
    seems to work fine Check if the parent container has overflow-y, overflow-x or overflow that's either auto or scroll.
    javascript for checking if horizontally scrollable:
    code :
    const container = document.getElementByClassName('container');
    const overflowY = getComputedStyle(div).overflowY;
    const verticallyScrollable = overflowY === "auto" || overflowY === "scroll";
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