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@islishude
Last active November 26, 2023 00:16
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[DEPRECATED]get/set caret position in contentEditable or textarea/input element(JavaScript)
/**
* @file get/set caret position and insert text
* @author islishude
* @license MIT
*/
export class Caret {
/**
* get/set caret position
* @param {HTMLColletion} target
*/
constructor(target) {
this.isContentEditable = target && target.contentEditable
this.target = target
}
/**
* get caret position
* @see {@link https://developer.mozilla.org/en-US/docs/Web/API/Range}
* @returns {number}
*/
getPos() {
// for contentedit field
if (this.isContentEditable) {
this.target.focus()
let _range = document.getSelection().getRangeAt(0)
let range = _range.cloneRange()
range.selectNodeContents(this.target)
range.setEnd(_range.endContainer, _range.endOffset)
return range.toString().length;
}
// for texterea/input element
return this.target.selectionStart
}
/**
* set caret position
* @param {number} pos - caret position
*/
setPos(pos) {
// for contentedit field
if (this.isContentEditable) {
this.target.focus()
document.getSelection().collapse(this.target, pos)
return
}
this.target.setSelectionRange(pos, pos)
}
}
/**
* insert text or orther to editor
* @see https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand
* @module Editor
*/
export class Editor {
constructor() {
}
/**
* @param {string} content - your insert text
* @returns {boolean}
*/
insertText(content) {
document.execCommand('insertText', false, content)
}
}
@JeanMarcZimmer
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@Grandclosing no, in the end I used a dirty solution for my syntax colouring.

@rm-arun-kumar
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I struggled with my project for two days. That's clear now. Thank you very much. 😍

@Yaffle
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Yaffle commented Apr 26, 2020

@Grandclosing, the second argument to Selection#collapse looks wrong, see https://developer.mozilla.org/en-US/docs/Web/API/Selection/collapse

@abohomol
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Hey, did anyone managed to get it to work or have found an alternative solution to get/set caret position inside the text with Html tags?

@Yaffle
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Yaffle commented Jul 31, 2020

@abohomol, I think, something like in https://stackoverflow.com/a/41034697/839199 should work

@abohomol
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abohomol commented Jul 31, 2020

@Yaffle Unfortunately, this one has an unsolved bug where the cursor doesn't account line breaks and the position is shifted. I've been trying to fix it with no luck for a day or two and gave up.

@Yaffle
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Yaffle commented Jul 31, 2020

@abohomol, I have my own similar solution at https://gist.github.com/Yaffle/117a0f6f92976b5cc6a6f570d911d912 , to handle
It just checks the tagName and considers it is like one new line character.

@jcward
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jcward commented Oct 12, 2021

Thanks for the breadcrumbs. I put the above stackoverflow snippet with minor modifications into a codepen demo -- I didn't see any problems with <br>.

Unlike some solutions, it doesn't maintain the selection range, but that's ok for my use case.

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