admin 管理员组文章数量: 1086019
I'm running the following code to set a limit on characters in a textarea:
(function($){
$.fn.extend({
limit: function(limit,element) {
var interval, f;
var self = $(this);
$(this).focus(function(){
interval = window.setInterval(substring,100);
});
$(this).blur(function(){
clearInterval(interval);
substring();
});
substringFunction = "function substring(){ var val = $(self).val();var length = val.length + carriages;if(length > limit){$(self).val($(self).val().substring(0,limit));}";
if(typeof element != 'undefined')
substringFunction += "if($(element).html() != limit-length){$(element).html((limit-length<=0)?'0':limit-length);}"
substringFunction += "}";
eval(substringFunction);
substring();
}
});
})(jQuery);
The area my users are entering text into can fit a maximum of 1500 characters. The problem is that it can only fit a maximum of 10 lines. If they enter 25 characters on one line before entering a carriage return, the characters total needs to be at 150, not 26.
How can I acplish this?
I'm running the following code to set a limit on characters in a textarea:
(function($){
$.fn.extend({
limit: function(limit,element) {
var interval, f;
var self = $(this);
$(this).focus(function(){
interval = window.setInterval(substring,100);
});
$(this).blur(function(){
clearInterval(interval);
substring();
});
substringFunction = "function substring(){ var val = $(self).val();var length = val.length + carriages;if(length > limit){$(self).val($(self).val().substring(0,limit));}";
if(typeof element != 'undefined')
substringFunction += "if($(element).html() != limit-length){$(element).html((limit-length<=0)?'0':limit-length);}"
substringFunction += "}";
eval(substringFunction);
substring();
}
});
})(jQuery);
The area my users are entering text into can fit a maximum of 1500 characters. The problem is that it can only fit a maximum of 10 lines. If they enter 25 characters on one line before entering a carriage return, the characters total needs to be at 150, not 26.
How can I acplish this?
Share Improve this question asked Jul 28, 2013 at 22:04 DabellatorDabellator 771 silver badge10 bronze badges 3- Why are you using eval? Please don't us eval. – Alex Wayne Commented Jul 28, 2013 at 22:21
- Thanks for the heads up! I hired someone to build the site for me, now I'm going through and changing things. Do you have a link to a different snippet I should use? This level of javascript is over my head. – Dabellator Commented Jul 28, 2013 at 22:47
- It's over your head because it's way over engineered... It's using advanced meta-programming features where plain simple code would have done just fine. Be careful who you hire to write JavaScript for you. They may not be doing you any favors. – Alex Wayne Commented Jul 28, 2013 at 23:08
2 Answers
Reset to default 7var string = "foo\nbar\nbaz";
console.log(string);
// foo
// bar
// baz
var lines = string.split(/\n/).length;
Simply split the string by every new lines, and then see how many lines you have.
Another solution using regex that is always very efficient. Note that this solution counts retuen carriages, NOT lines
const string = "foo\nbar\nbaz";
const lines = (string.match(/\n/g) || []).length;
console.log(lines);
本文标签: Count carriage returns in javascriptStack Overflow
版权声明:本文标题:Count carriage returns in javascript - Stack Overflow 内容由网友自发贡献,该文观点仅代表作者本人, 转载请联系作者并注明出处:http://roclinux.cn/p/1744053709a2525453.html, 本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容,一经查实,本站将立刻删除。
发表评论