string-length

问题 How do I get a long text string (like a querystring) to display a maximum of 10 characters, using JQuery? Sorry guys I'm a novice at JavaScript & JQuery :S Any help would be greatly appreciated. 回答1: If I understand correctly you want to limit a string to 10 characters? var str = 'Some very long string'; if(str.length > 10) str = str.substring(0,10); Something like that? 回答2: And here's a jQuery example: HTML text field: <input type="text" id="myTextfield" /> jQuery code to limit its size:

问题 I'm having a problem trying to get a character count column of the string values in another column, and haven't figured out how to do it efficiently. for index in range(len(df)): df['char_length'][index] = len(df['string'][index])) This apparently involves first creating a column of nulls and then rewriting it, and it takes a really long time on my data set. So what's the most effective way of getting something like 'string' 'char_length' abcd 4 abcde 5 I've checked around quite a bit, but I

问题 How to find the length of a string (number of characters in a string) without splitting it in R? I know how to find the length of a list but not of a string. And what about Unicode strings? How do I find the length (in bytes) and the number of characters (runes, symbols) in a Unicode string? Related Question: How to find the "real" number of characters in a Unicode string in R 回答1: See ?nchar . For example: > nchar("foo") [1] 3 > set.seed(10) > strn <- paste(sample(LETTERS, 10), collapse = ""

问题 I was wondering if anybody knows the total length that a post global could be. e.g: $_POST['formInput'] = "hello world, how long can i be?"; I am creating a site where someone will enter an unknown amount of chars into a textarea, so potentially it could be 2 pages on a word document. So if anybody knows of any other methods of how i can do this apart from using a post global? (it cant be saved in a file, as its important data that i dont want other people to find) That would be very helpful.

问题 For example, I get a string: str = "please answer my question" I want to write it to a file. But I need to know the size of the string before writing the string to the file. What function can I use to calculate the size of the string? 回答1: If you are talking about the length of the string, you can use len(): >>> s = 'please answer my question' >>> len(s) # number of characters in s 25 If you need the size of the string in bytes, you need sys.getsizeof(): >>> import sys >>> sys.getsizeof(s) 58

问题 How should I get the number of characters in a string in C++? 回答1: If you're using a std::string , call length(): std::string str = "hello"; std::cout << str << ":" << str.length(); // Outputs "hello:5" If you're using a c-string, call strlen(). const char *str = "hello"; std::cout << str << ":" << strlen(str); // Outputs "hello:5" Or, if you happen to like using Pascal-style strings (or f***** strings as Joel Spolsky likes to call them when they have a trailing NULL), just dereference the

问题 How to calculate the length (in pixels) of a string in Java? Preferable without using Swing. EDIT: I would like to draw the string using the drawString() in Java2D and use the length for word wrapping. 回答1: If you just want to use AWT, then use Graphics.getFontMetrics (optionally specifying the font, for a non-default one) to get a FontMetrics and then FontMetrics.stringWidth to find the width for the specified string. For example, if you have a Graphics variable called g , you'd use: int

问题 I've asked the same question about strncpy, but there the string ends up containing the whole input string. When passing a string to vsnprintf the last character always gets chopped off: https://rextester.com/UIQMX91570 For simplicity I've also included the live example link above inline in the code: void bar(const char* format, va_list vlist) { const auto buf_size = vsnprintf(nullptr, 0U, format, vlist); string buffer(buf_size, '\0'); vsnprintf(data(buffer), buf_size, format, vlist); cout <<

问题 Edit: Solutions must compile against Microsoft Visual Studio 2012. I want to use a known string length to declare another string of the same length. The reasoning is the second string will act as a container for operation done to the first string which must be non volatile with regards to it. e.g. const string messy "a bunch of letters"; string dostuff(string sentence) { string organised NNN????? // Idk, just needs the same size. for ( x = 0; x < NNN?; x++) { organised[x] = sentence[x]++; //

问题 I need to make function that determine longer word of two entered. I have tried to use if-statement and String.Length , but I can't get it right. What would be the best way to make the function? Below is the main program. using System; using System.Collections.Generic; using System.Linq; using System.Text; public class LongerWord { public static void Main(string[] args) { Console.Write("Give 1. word >"); String word1 = Console.ReadLine(); Console.Write("Give 2. word >"); String word2 =