在textarea中限制单行中的行数和字母数量 [英] Limiting number of lines and letters in single line in textarea
问题描述
问题:
我想限制文本框中每行的行数和字母数。
到目前为止:
到目前为止,我设法使用此限制行数:
var text = $(this).val();
var lines = text.split(\\\
); (e.keyCode == 13&& line.length> = $(this).attr('rows')){
return false;
if
$ / code>
这将不允许用户按下返回键(keyCode 13)线路达到限制。
问题:
现在我想限制一行中的字母数量,因为如果我到达我的textarea的末尾(带返回键),我仍然可以持有一个字母/写入大量文本,并在到达行尾时跳到另一行。这样,这个限制可以被欺骗,我正在寻找一个解决方案。
我的想法,没有解决问题:
else {
for(var i = 0; i< lines.length&& e.keyCode! = 13; i ++){
if(lines [i] .length> = $(this).attr('cols')){
return false; //防止字符出现
code $ $ $ $ $ $ $ $ $ $ $ $ $我试图限制字母数量。这有效,但它有缺陷。如果我在一行( ANY )中达到最大字母数,则我将 任意行中的CANT类型 。
我不知道如何检查只输入RIGHT NOW的行。
h2_lin>解决方案
使用chrome进行测试:
http:// jsfiddle .net / 3e3EH / 1 /
$(document).ready(function(){
var textArea = $('#foo');
var maxRows = textArea.attr('rows');
var maxChars = textArea.attr('cols');
textArea.keypress (函数(e){
var text = textArea.val();
var lines = text.split('\\\
');
if(e.keyCode == 13) {
return lines.length< maxRows;
}
else {
var caret = textArea.get(0).selectionStart;
console.log(插入符号) ;
var line = 0;
var charCount = 0;
$ .each(lines,function(i,e){
charCount + = e.length ;
if(ca ret <= charCount){
line = i;
返回false;
}
// \\\
count for 1 char;
charCount + = 1;
});
var theLine = lines [line];
返回theLine.length< maxChars属性;
}
});
));
编辑
正如jbabey指出的,ctrl + v或右键单击 - >粘贴可能是一个问题。右键点击可以很容易地避免。对于Ctrl + V,你可能会发现它...
只是禁用javascript显然会打破这个事情。
无论如何,作为任何客户端验证,您必须在服务器端进行仔细检查。
Problem:
I am trying to limit number of lines AND letters in each line in a textbox.
What i got so far:
So far i managed to limit lines count using this:
var text = $(this).val();
var lines = text.split("\n");
if(e.keyCode == 13 && lines.length >= $(this).attr('rows')) {
return false;
}
This won't allow user to push return key (keyCode 13) if the limit of lines is reached.
The problem:
Now i am trying to limit number of letters in a single line too, because if i reach end of my textarea (with return key) i still can hold a letter/write tons of text, and it will jump to another line when it reaches end of line. That way this limitation can be "cheated" and i am looking for a solution for that.
My ideas, not solving the problem:
else{
for(var i = 0; i < lines.length && e.keyCode != 13; i++) {
if(lines[i].length >= $(this).attr('cols')) {
return false; // prevent characters from appearing
}
}
}
I tried this to limit number of letters. That works, but it got flaws. If i reach max letters in one line (ANY), i CANT TYPE IN ANY LINE anymore.
I have no idea how to check only line i am typing in RIGHT NOW.
Tested in chrome : http://jsfiddle.net/3e3EH/1/
$(document).ready(function(){
var textArea = $('#foo');
var maxRows = textArea.attr('rows');
var maxChars = textArea.attr('cols');
textArea.keypress(function(e){
var text = textArea.val();
var lines = text.split('\n');
if (e.keyCode == 13){
return lines.length < maxRows;
}
else{
var caret = textArea.get(0).selectionStart;
console.log(caret);
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;
}
});
});
Edit
As jbabey pointed out, ctrl+v or right-click -> paste can be an issue. right click can easily be prevented. for ctrl+v, you probable can detect it too... Just disabling javascript will obviously break the thing, too. Anyways, as any client-side validation, you have to double check on server-side.
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