Any way to determine if an element is wrapped?

问题:

Basically, I have a certain HTML element (in this case, a div) that is wrapping to a new line in the case of a below average screen resolution, due to a floating element. I want to control this behavior, placing and/or styling the element differently if indeed it is currently wrapped or will be wrapped upon resize/onload.

Is this possible?

回答1:

You can count the number of text rectangles it has using element.getClientRects(), which returns a ClientRect object for each border-box of an element. This must be done on an inline element such as a <span> for each line of text to have its own border-box, but it's simple enough to use:

window.onresize = function () {
    var span = document.getElementById("myDiv").getElementsByTagName("span")[0],
        rect = span.getClientRects();

    if (rect.length > 1) // more than 1 line of text
        doSomethingWithElement(span.parentNode);
}