javascript - Is it possible to programmatically detect the caret position within a <input type=text> element? -

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assuming regular <input type=text> text-box data in it.

is possible detect (via javascript) position of text-coursor inside text-box?

i able detect arrow left or arrow right keydown event - how detect cursor location?

why need this:

i have dynamic text-box here: http://vidasp.net/tinydemos/dynamic-textbox.html
works great, there 2 scenarios fix:

  1. when cursor @ beginning of text-box , user presses backspace
  2. when cursor @ end of text-box , user presses delete

(in both cases, text-box must contain data effect observable.)

i've done quite lot of work on this. following works in major browsers (including ie 6) text <input>s , <textarea>s , work in situations, including when there leading , trailing spaces (which many solutions, including a-tools, fall down). there's background code in question: ie's document.selection.createrange doesn't include leading or trailing blank lines

you can following part of jquery input/textarea selection plug-in i've written yet undocumented: http://code.google.com/p/rangyinputs/

function getinputselection(el) {     var start = 0, end = 0, normalizedvalue, range,         textinputrange, len, endrange;      if (typeof el.selectionstart == "number" && typeof el.selectionend == "number") {         start = el.selectionstart;         end = el.selectionend;     } else {         range = document.selection.createrange();          if (range && range.parentelement() == el) {             len = el.value.length;             normalizedvalue = el.value.replace(/\r\n/g, "\n");              // create working textrange lives in input             textinputrange = el.createtextrange();             textinputrange.movetobookmark(range.getbookmark());              // check if start , end of selection @ end             // of input, since movestart/moveend doesn't return want             // in cases             endrange = el.createtextrange();             endrange.collapse(false);              if (textinputrange.compareendpoints("starttoend", endrange) > -1) {                 start = end = len;             } else {                 start = -textinputrange.movestart("character", -len);                 start += normalizedvalue.slice(0, start).split("\n").length - 1;                  if (textinputrange.compareendpoints("endtoend", endrange) > -1) {                     end = len;                 } else {                     end = -textinputrange.moveend("character", -len);                     end += normalizedvalue.slice(0, end).split("\n").length - 1;                 }             }         }     }      return {         start: start,         end: end     }; }  var el = document.getelementbyid("your_input"); var sel = getinputselection(el); alert(sel.start + ", " + sel.end);

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