Javascript / JQuery：如何计算用逗号分隔的单词？
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Javascript / JQuery: How do I count the words separated with a comma?
提问by mattsven
Javascript:
Javascript：
$(document).ready(function()
{
$('#field').keyup(function()
{
var count = '??';
$('#count').html(count);
});
});
HTML:
HTML：
<input type="text" id="field" /> <span id="count">5</span>
Examples (words are always separated with a comma):
示例（单词总是用逗号分隔）：
example 1: word, word word
count: (5 - 2) = 3
example 2: word
count: (5 - 1) = 4
example 3: word, word,
count: (5 - 2) = 3
example 4: word, word, word
count: (5 - 3) = 2
So, I need to count how many words there are separated with a comma, but for example as shown in example 3, it should not count them as 3 wordsonly when there is a word also AFTER a comma.
因此，我需要计算用逗号分隔的单词数量，但例如如示例 3所示，仅当在逗号之后也有单词时，不应将它们计为3个单词。
And a user should not be allowed to enter more than 5 words.
并且不允许用户输入超过 5 个单词。
回答by mattsven
Something like:
就像是：
$("#input").keyup(function(){
var value = $(this).val().replace(" ", "");
var words = value.split(",");
if(words.length > 5){
alert("Hey! That's more than 5 words!");
$(this).val("");
}
});
jsFiddle example: http://jsfiddle.net/BzN5W/
jsFiddle 示例：http: //jsfiddle.net/BzN5W/
EDIT:
编辑：
Better example: http://jsfiddle.net/BzN5W/2/
更好的例子：http: //jsfiddle.net/BzN5W/2/
$("#input").keypress(function(e){
var value = $(this).val().replace(" ", "");
var words = value.split(",");
if(words.length > 5){
//alert("Hey! That's more than 5 words!");
e.preventDefault();
}
});
回答by Fareesh Vijayarangam
words.split(",").lengthshould give you what you want, where wordsis a string containing the input.
words.split(",").length应该给你你想要的，words包含输入的字符串在哪里。
回答by Simeon
I think you are looking for this:
我想你正在寻找这个：
$('#field').keyup(function(e){
var count = $(this).val().split(',').length;
$('#count').html(count);
if(count > 4)
e.preventDefault();
});
