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我试图将IE8浏览器中文本区域的行数限制为20,每行的字符数限制为15。我尝试了像https://stackoverflow.com/a/11586266/1453499这样的stackoverflow已经可用的解决方案,但是所有这些解决方案都适用于Chrome和其他现代浏览器,而不是IE8。有没有与IE8兼容的解决方案?文本区域中单行限制行数和字母数
我试图将IE8浏览器中文本区域的行数限制为20,每行的字符数限制为15。我尝试了像https://stackoverflow.com/a/11586266/1453499这样的stackoverflow已经可用的解决方案,但是所有这些解决方案都适用于Chrome和其他现代浏览器,而不是IE8。有没有与IE8兼容的解决方案?文本区域中单行限制行数和字母数
我用了两个答案(https://stackoverflow.com/a/3373056/1453499 & https://stackoverflow.com/a/11586266/1453499)的组合,以找到解决我的问题,下面是最终的解决方案
function getInputSelection(el) {
var start = 0, normalizedValue, range,
textInputRange, len, endRange;
if (typeof el.selectionStart === "number" && typeof el.selectionEnd === "number") {
start = el.selectionStart;
} else {
range = document.selection.createRange();
if (range && range.parentElement() === el) {
normalizedValue = el.value.replace(/\r\n/g, "\n");
len = normalizedValue.length;
// 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 = len;
} else {
start = -textInputRange.moveStart("character", -len);
start += normalizedValue.slice(0, start).split("\n").length - 1;
}
}
}
return start;
}
$(document).ready(function() {
//Restrict the search
var textArea = $('#textarea_id');
var maxRows = 30;
var maxChars = 17;
textArea.keypress(function(e) {
var text = textArea.val();
var lines = text.split('\n');
if (e.keyCode === 13) {
return lines.length < maxRows;
} else { //Should check for backspace/del/etc.
var caret = getInputSelection(textArea.get(0));
var line = 0;
var charCount = 0;
$.each(lines, function(i, e) {
charCount += e.length;
if (caret <= charCount) {
line = i;
return false;
}
//\n count for 1 char;
charCount += 1;
});
var theLine = lines[line];
return theLine.length < maxChars;
}
});
});
改变'textArea.keypress(功能(E)''到textarea的。 on('keypress change keyup',function(e)'does not help? –
这没有帮助,问题是使用textArea.get(0).selectionStart语句 – coder