在字符串中计算逗号 [英] Counting commas within a string
问题描述
你好：
我有一个包含多选字段的表单，其中有12个
选项。我希望用户能够选择最多四个这样的选项
。如果他们选择了超过四个，我想提醒他们错误。要做到这一点，我认为计算逗号将是最简单的方法（例如，IF逗号> 3那么警告用户）。
注意：我有一个现有的validateForm这个表格的功能和我要
喜欢将这个IF-THEN语句添加到它。
非常感谢任何帮助。此外，如果有一个更好的方法
而不是逗号计数我很满意。 :)
谢谢，
Mike
* Mike N. *在comp.lang.javascript中写道 ：您好：
我有一个包含多选字段的表单，其中包含12
选项。我希望用户能够选择最多四个这些选项。如果他们选择了四个以上，我想提醒他们这个错误。为此，我认为计算逗号将是最简单的方法（即，IF逗号> 3那么警告用户）。
注意：我有一个现有的validateForm。这个表格的功能我想要将这个IF-THEN语句添加到它。
非常感谢任何帮助。此外，如果有比逗号计数更好的方法
我很满意。 ：）
假设''strValue''是您在上面描述的CSV字符串，那么：
var intNumFields = strValue .split（"，"）。length;
这个值是你选择的数量，而不是它们之间逗号的数字
。
//例如：
var MAXFIELDS = 4;
if（intNumFields> MAXFIELDS）{
提醒（对不起，请选择最多+ MAXFIELDS +"
选项）
返回false;
}
-
Andrew Urquhart
- 常见问题： http://www.jibbering.com/faq/
- 存档： http://groups.google.com/groups?grou...ang。 javascript
- 与我联系： http://andrewu.co.uk/contact/
感谢您的快速回复！
不幸的是，它不适合我。基本上，无论我选择多少（一个，五个或全部），它都会跳过这段代码（没有发现错误我猜了）。
你确定这一行是正确的吗？
var intNumFields = strValue.split（"，"）。length;
我不熟悉.length它的一部分。
再次感谢！
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* Mike N. *在comp.lang.javascript中写道 ：感谢您的提示回复！
不幸的是，这对我不起作用。基本上，无论我选择了多少（一个，五个或全部），它都会跳过这段代码（没有找到我猜错的错误）。
[ snip]
请发布一个不起作用的示例URI - 可能还有另一个
问题。
-
Andrew Urquhart
- 常见问题： http://www.jibbering.com/faq/
- 存档： http://groups.google.com/groups?grou...ang.javascript
- 与我联系： http://andrewu.co.uk/contact/
Hello:
I have a form that contains a multiple-select field that has 12
options in it. I would like the user to be able to select UP TO FOUR
of those options. If they select more than four, I would like to alert
them of the error. To do this, I figure that counting commas would be
the easiest method (i.e., IF commas > 3 THEN alert user).
NOTE: I have an existing "validateForm" function for this form and I''d
like to add this IF-THEN STATEMENT to it.
Any assistance is much appreciated. Also, if there''s a better method
than "comma counting" I''m all ears. :)
Thanks,
Mike
*Mike N.* wrote in comp.lang.javascript:Hello:
I have a form that contains a multiple-select field that has 12
options in it. I would like the user to be able to select UP TO FOUR
of those options. If they select more than four, I would like to alert
them of the error. To do this, I figure that counting commas would be
the easiest method (i.e., IF commas > 3 THEN alert user).
NOTE: I have an existing "validateForm" function for this form and I''d
like to add this IF-THEN STATEMENT to it.
Any assistance is much appreciated. Also, if there''s a better method
than "comma counting" I''m all ears. :)
Assuming ''strValue'' is the CSV string you describe above, then:
var intNumFields = strValue.split(",").length;
This value is the number of selections you have, rather than the number
of commas between them.
// E.g.:
var MAXFIELDS = 4;
if (intNumFields > MAXFIELDS) {
alert("Sorry, please select up to a maximum of " + MAXFIELDS + "
choices")
return false;
}
--
Andrew Urquhart
- FAQ: http://www.jibbering.com/faq/
- Archive: http://groups.google.com/groups?grou...ang.javascript
- Contact me: http://andrewu.co.uk/contact/
Thanks for the prompt response!
Unfortunately, it''s not working for me. Basically, no matter how many I
select (one, five, or all) it skips this code (not finding an error I
guess).
Are you sure this line is correct?
var intNumFields = strValue.split(",").length;
I am not familiar with the ".length" portion of it.
Thanks again!
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*Mike N.* wrote in comp.lang.javascript:Thanks for the prompt response!
Unfortunately, it''s not working for me. Basically, no matter how many I
select (one, five, or all) it skips this code (not finding an error I
guess).
[snip]
Please post an example URI of it not working - there''s likely another
problem.
--
Andrew Urquhart
- FAQ: http://www.jibbering.com/faq/
- Archive: http://groups.google.com/groups?grou...ang.javascript
- Contact me: http://andrewu.co.uk/contact/
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