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Get bounding rectangle of selected text javascript

I use this code How can I position an element next to user text selection? to get the position of the selected text, but it doesn't work for the selected text inside an input. Sometimes the position is 0.
Is there some universal method for detecting the position of the selected text?
I want to show a tooltip on mouseup or dblclick the selected text.

You can use the following code to get the position of selected text:
var selection = window.getSelection();
var getRange = selection.getRangeAt(0);
getRect = getRange.getBoundingClientRect();

You can use getSelection api.
After selection a text run below code in console.
var selection = window.getSelection()
var baseOffset = selection.baseOffset
var length = selection.focusOffset -selection.baseOffset
var text = selection.focusNode.data.splice(baseOffset, length)

If you just need to get the position where the user doubleclicked, use the following snippet.
$('#thatInput').on('dblclick', function (e) {
alert('Position X: ' + e.clientX + '\nPosition Y: ' + e.clientY);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input id="thatInput">

The question is about getting the position of mouse pointer when selecting text. I am trying a solution that also works with keyboard events (choosed keyup).
I wrote a sample html page with a "vanilla" script inside to test the capabilities of the Selection API. This is the idea:
When selecting on text nodes, getting the position of selected text is done by means of the Range Object.
But when the selected text is a part of an Input Element, using the getBoundingClientRect() of the Range Object does not work (gave me a full zero ClientRect Object.
So, the function getSel() will try to consider both scenarios: selecting text just from the HTML or inside some input elements (just considered input and textarea).
On the bottom of the page there is a div#results element, for displaying data, then getSel() will create a new div#boundy with the coordinates of the ClientRect object or the related input element coordinates.
I wish to finish it, but I'm out of ideas on how to get the actual position of the selected text inside the input objects. It will have to be adding in a relative way to the coordinates of the element itself.
Answering Andrew, if this works, you'll be able to use the coordinates of div#boundy to place the tooltip wherever you want.
I've created a codepen here.

Trigger function on input event if selected text is within input

I've built a page where you can filter results by typing into an input box.
Basic mechanics are:
Start typing, input event is fired, elements without matching text begin hiding
If input becomes empty (or if you click a reset button), all elements are shown again
I have noticed a problem, though, when highlighting text. Say I type "apple" into the input. Then I highlight it, and type "orange."
If an element exists on the page containing "orange," but it was already hidden because I filtered for "apple," it does not show up. I have gathered this is because the input never truly empties; rather, I simply replace "apple" with the "o" from orange before continuing with "r-a-n-g-e." This means I get a subset of "apple" results that contain "orange," as if I had typed "apple orange."
What I really want to do is clear my input on the keypress for the "o" in "orange" before hiding nonmatching elements, so I'm effectively searching the whole page for "orange."
What I've tried so far
1: Set input value to '' on select event:
$('.myinput').on('select', function(){
$(this).val('');
});
This doesn't work because it just deletes my highlighted text, which is unexpected. I only want to reset the input on the keypress following the highlight.
2: Include an if statement in my input event that checks if there is a selection within the input:
$('.myinput').on('input', function(){
var highlightedText = window.getSelection();
if($(highlightedText).parent('.myinput')) {
//reset my input
}
});
This doesn't work because it seems to fire on every keypress, regardless of if there is any actual selection. (Are user inputs always treated as selected?)
3: Add a select event listener to the input element, and set a variable to true if there's a selection. Then, in my input event, check if the variable is true on keypress.
$(function(){
var highlightedText = false;
$('.myinput').on('input', function(){
if(highlightedText = true) {
//reset my input
}
//do stuff
highlightedText = false;
});
$('.myinput').on('select', function(){
highlightedText = true;
});
});
I really thought this one would work because a basic console log in the select function only fires when I want it to – when text in the input is highlighted, but not when other text is highlighted and not when text is entered into the input. But alas, when I change that to a variable toggle, it seems to fire on every keypress again.
So the question is: How can I fire a function on input only if text in my input is highlighted?
I have found this question that suggests binding to the mouseup event, but it seems like overkill to check every single click when I'm only worried about a pretty particular situation. Also, that solution relies on window.getSelection(), which so far isn't working for me.
I've also found another question that suggests to use window.selectionEnd instead of window.getSelection() since I'm working with a text input. I tried incorporating that into option 2 above, but it also seems to fire on every keypress, rather than on highlight.

This answer is not about text selection at all.
But still solve your problem to refilter text when highlighted text is being replaced with new input.
var input = document.getElementById('ok');
var character = document.getElementById('char');
var previousCount = 0;
var currentCount = 0;
input.addEventListener('input', function(){
currentCount = this.value.length;
if (currentCount <= previousCount){
/*
This will detect if you replace the highlighted text into new text.
You can redo the filter here.
*/
console.log('Highlighted text replaced with: ' + this.value);
}
previousCount = currentCount;
char.innerHTML = this.value;
});
<input type="text" id="ok">
<div id="char"></div>

I'll agree with others that you will save yourself some trouble if you change your filtering strategy - I'd say you should filter all content from scratch at each keypress, as opposed to filtering successively the content that remains.
Anyway, to solve your immediate problem, I think you can just get the selection and see if it is empty. You can modify your second attempt:
$('.myinput').on('input', function(){
// get the string representation of the selection
var highlightedText = window.getSelection().toString();
if(highlightedText.length) {
//reset my input
}
});
EDIT
As this solution seems to have various problems, I can suggest another, along the lines of the comment from #Bee157. You can save the old search string and check if the new one has the old as a substring (and if not, reset the display).
var oldSearch = '';
$('.myinput').on('input', function(){
var newSearch = $('.myinput').val();
if (newSearch.indexOf(oldSearch) == -1) {
// reset the display
console.log('RESET');
}
oldSearch = newSearch;
// filter the results...
});
This approach has the added benefit that old results will reappear when you backspace. I tried it in your codepen, and I was able to log 'RESET' at all the appropriate moments.

Set window selection from a previously saved selection object

If I have a selection object from a textarea (with a class of my-text-area) using window.getSelection(), if this selection loses focus (say if the user clicks on another input field), is there a way I can set this selection again programmatically?
I've tried doing something like this:
When I have focus:
var currentSelection = window.getSelection();
After I lose focus and want to set the selection again:
var range = currentSelection.getRangeAt(0);
range.selectNode($('.my-text-area')[0]);
var sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);
This seems to select everything in my textarea though, not just the small selected area initially.

Just found the excellent Rangy library, that contains a Selection Save and Restore module that does exactly this: https://github.com/timdown/rangy/wiki/Selection-Save-Restore-Module

Get multiple elements from document.getSelection()

How can I get the multiple elements a user has selected from document.getSelection()?
document.getElementById("hello").onclick = function() {
selection = document.getSelection();
if(selection) {
console.log(selection.anchorNode.textContent);
}
};
http://jsbin.com/qisawudofa/edit?html,js,console,output
It seems to only return the element that was selected first, but in my case I need to get all of them.
Alternatively, is there a way to at least know when multiple elements have been selected?

You're probably most interested in the Ranges that make up the selection. Remember the user can make multiple selections all over the page. Each continuous area of selection will get its own instance of Range.
You'll need to iterate over all of the ranges. For each of them you can see where it starts and where it ends:
if (selection) {
for (i=0; i<selection.rangeCount; i++) {
range = selection.getRangeAt(i);
if (range) {
console.log(range.startContainer);
console.log(range.endContainer);
}
}
}
But for the example described in your code you'll need to consider two more things:
Only if the user very accurately selects a paragraph will you get the paragraph's node in startContainer. They might start their start selection even one character after the beginning of the paragraph and then you'll get a text node with the paragraph as its parent.
The Range only gives you the start and the end of the selection for that range. It doesn't directly give you all of the elements in between. So if the user selects more than 2 paragraphs, you'll need to figure out exactly which paragraphs are between start and end yourself.

Move Selection to next word using JavaScript

I have some html text i.e.
This is line1
I can get the initial user selection using window.getSelection() assume it is 'This'. On a click of a button, I like the user selection to move to the next word i.e. 'is'. How can I do this? I currently have the following code which does not work:
function myFunction()
{
var selection=window.getSelection();
selection.collapse(selection.focusNode, 0);
selection.modify("move","forward","word");
selection.extend(selection.focusNode, selection.focusOffSet);
}
and this is't good for me, because even the earlier word stays selected
var selection = window.getSelection();
selection.modify("extend", "forward", "word");