javascript - Is it possible to get selectionchange-like events for an input box in Firefox? -


how can selected text inside input box in firefox?

this apparently fundamental difference in way javascript works between chrome , firefox. reproduce:

  • navigate www.google.com
  • open js console
  • type following line: document.addeventlistener("selectionchange", () => console.log(document.getselection().tostring()))
  • type "text" google search box , not hit enter
  • use mouse select different portions of "text" in search box

in chrome, see event raised selected text within input element. consistent across various web pages use input fields. in firefox, event raised selections outside input, when text in box selected, no event raised.

i have not found explicit reference difference in mozilla documentation, nor have found mention of on other web page.

related different question

firefox web extension “selectionchange” older question, , dom.select_events.enabled config attribute defaulted true in ff 56. there second config attribute, dom.select_events.textcontrols.enabled seems i'm looking for, changing value true doesn't seem have effect.

additional info (edit 1)

apparently there isn't way selected text in textbox in ff? following code doesn't work:

setinterval(() => console.log(document.getselection().tostring()), 1000)

in ff, never return selected text in input field. in chrome, will.

is feature gap in ff? there no other way extract selected text form field?

based on this answer have been able create following:

window.addeventlistener('mouseup', function () {     selection = getselectedtext(); });   function getselectedtext() {     let elem = document.activeelement;     let elemtype = elem ? elem.tagname.tolowercase() : 'none';     if (elemtype === 'input' || elemtype === 'textarea') {         return elem.value.substr(elem.selectionstart, elem.selectionend - elem.selectionstart);     }      if (window.getselection) {         return window.getselection().tostring();     }      if (document.selection && document.selection.type !== 'control') {         return document.selection.createrange().text;     }     return ''; }

my testing far shows seems work both chrome , firefox.


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