contenteditable，在文本末尾设置插入符号(跨浏览器) [英] contenteditable, set caret at the end of the text (cross-browser)

问题描述

Chrome 中的输出:

<div id="content" contenteditable="true" style="border:1px solid #000;width:500px;height:40px;">
    hey
    <div>what's up?</div>
<div>
<button id="insert_caret"></button>

我相信 FF 它看起来像这样:

I believe in FF it would look something like this:

hey
<br />
what's up?

和IE:

hey
<p>what's up?</p>

不幸的是，没有好的方法可以让每个浏览器插入 <br/> 而不是 div- 或 p-tag，或者至少我找不到网上的任何东西.

unfortunately, there is no nice way of making it so that every browser inserts a <br /> instead of a div- or p-tag, or at least I couldn't find anything online.

无论如何，我现在想要做的是，当我点击按钮时，我希望将插入符号设置在文本的末尾，所以它应该看起来像这样:

ANYWAY, what I am trying to do now is, when I hit the button, I want the caret to be set at the end of the text, so it should look something like this:

hey
what's up?|

有什么方法可以使其在所有浏览器中都能正常工作?

any way to do this so it works in all browser?

示例:

$(document).ready(function()
{
    $('#insert_caret').click(function()
    {
        var ele = $('#content');
        var length = ele.html().length;

        ele.focus();

        //set caret -> end pos
     }
 }

推荐答案

以下函数将在所有主流浏览器中完成:

The following function will do it in all major browsers:

function placeCaretAtEnd(el) {
    el.focus();
    if (typeof window.getSelection != "undefined"
            && typeof document.createRange != "undefined") {
        var range = document.createRange();
        range.selectNodeContents(el);
        range.collapse(false);
        var sel = window.getSelection();
        sel.removeAllRanges();
        sel.addRange(range);
    } else if (typeof document.body.createTextRange != "undefined") {
        var textRange = document.body.createTextRange();
        textRange.moveToElementText(el);
        textRange.collapse(false);
        textRange.select();
    }
}

placeCaretAtEnd( document.querySelector('p') );

p{ padding:.5em; border:1px solid black; }

<p contentEditable>foo bar </p>

将插入符号放在开头几乎相同:它只需要更改传递给 collapse() 调用的布尔值.下面是一个创建用于在开头和结尾放置插入符号的函数的示例:

Placing the caret at the start is almost identical: it just requires changing the Boolean passed into the calls to collapse(). Here's an example that creates functions for placing the caret at the start and at the end:

function createCaretPlacer(atStart) {
    return function(el) {
        el.focus();
        if (typeof window.getSelection != "undefined"
                && typeof document.createRange != "undefined") {
            var range = document.createRange();
            range.selectNodeContents(el);
            range.collapse(atStart);
            var sel = window.getSelection();
            sel.removeAllRanges();
            sel.addRange(range);
        } else if (typeof document.body.createTextRange != "undefined") {
            var textRange = document.body.createTextRange();
            textRange.moveToElementText(el);
            textRange.collapse(atStart);
            textRange.select();
        }
    };
}

var placeCaretAtStart = createCaretPlacer(true);
var placeCaretAtEnd = createCaretPlacer(false);

这篇关于contenteditable，在文本末尾设置插入符号(跨浏览器)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！