找出在实际浏览器中选择的内容非常简单:
var range = { start: textbox.selectionStart, end: textbox.selectionEnd }
但是IE和往常一样不懂。跨浏览器的最佳方法是什么?
我将再次发布此函数,以查看该问题是否与另一个问题相关联。
以下将在所有浏览器中完成工作,并处理所有新行问题,而不会严重影响性能。我经过一番折腾之后才来到这里,现在我很确信这是最好的功能。
更新
此函数确实假定textarea / input具有焦点,因此您可能需要在调用textarea的focus()方法之前先对其进行调用。
focus()
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 a working TextRange that lives only in the input textInputRange = el.createTextRange(); textInputRange.moveToBookmark(range.getBookmark()); // Check if the start and end of the selection are at the very end // of the input, since moveStart/moveEnd doesn't return what we want // in those 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"); el.focus(); var sel = getInputSelection(el); alert(sel.start + ", " + sel.end);