@pie-lib/text-select
Version:
Some react components for text selection
50 lines (48 loc) • 1.83 kB
JavaScript
export const clearSelection = () => {
if (document.getSelection) {
// for all new browsers (IE9+, Chrome, Firefox)
document.getSelection().removeAllRanges();
document.getSelection().addRange(document.createRange());
} else if (window.getSelection) {
// equals with the document.getSelection (MSDN info)
if (window.getSelection().removeAllRanges) {
// for all new browsers (IE9+, Chrome, Firefox)
window.getSelection().removeAllRanges();
window.getSelection().addRange(document.createRange());
} else if (window.getSelection().empty) {
// Chrome supports this as well
window.getSelection().empty();
}
} else if (document.selection) {
// IE8-
document.selection.empty();
}
};
export const getCaretCharacterOffsetWithin = (element) => {
var caretOffset = 0;
var doc = element.ownerDocument || element.document;
var win = doc.defaultView || doc.parentWindow;
var sel;
if (typeof win.getSelection !== 'undefined') {
sel = win.getSelection();
if (sel.rangeCount > 0) {
var range = win.getSelection().getRangeAt(0);
var selected = range.toString().length;
var preCaretRange = range.cloneRange();
preCaretRange.selectNodeContents(element);
preCaretRange.setEnd(range.endContainer, range.endOffset);
if (selected) {
caretOffset = preCaretRange.toString().length - selected;
} else {
caretOffset = preCaretRange.toString().length;
}
}
} else if ((sel = doc.selection) && sel.type !== 'Control') {
var textRange = sel.createRange();
var preCaretTextRange = doc.body.createTextRange();
preCaretTextRange.moveToElementText(element);
preCaretTextRange.setEndPoint('EndToEnd', textRange);
caretOffset = preCaretTextRange.text.length;
}
return caretOffset;
};