javascript jQuery - 给定一个逗号分隔的列表，如何确定一个值是否存在
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javascript jQuery - Given a comma delimited list, how to determine if a value exists
提问by TheExit
given a list like:
给出一个列表，如：
1,3,412,51213,[email protected], blahblah, 123123123123
which lives inside of a input type"text" as a value:
它作为值存在于输入类型“文本”中：
<input type="text" value="1,3,412,51213,[email protected], blahblah, 123123123123, [email protected]" />
How can I determine if a value exists, like 3, or blahblah or [email protected]?
如何确定值是否存在，例如 3、blahblah 或 [email protected]？
I tried spliting with inputval.split(',') but that only gives me arrays. Is search possible?
我尝试用 inputval.split(',') 进行拆分，但这只给了我数组。可以搜索吗？
回答by SLaks
回答by Tatu Ulmanen
Utilizing jQuery:
使用 jQuery：
var exists = $.inArray(searchTerm, $('input').val().split(',')) != -1;
existsis now an boolean value indicating whether searchTermwas found in the values.
exists现在是一个布尔值，指示是否searchTerm在值中找到。
回答by John Fisher
var list = inputval.split(',');
var found = false;
for (var i=0; i<list.length; ++i) {
if (list[i] == whateverValue) {
found = true;
break;
}
}
You can be extra picky about the value matching by using "===" if it must be of the same type. Otherwise, just use "==" since it will compare an int to a string in a way that you probably expect.
如果必须是相同类型，您可以通过使用“===”对值匹配更加挑剔。否则，只需使用“==”，因为它会以您可能期望的方式将 int 与字符串进行比较。
回答by Dutchie432
You'l want to use var arr = theString.split(',')and then use var pos = arr.indexOf('3');
你会想使用var arr = theString.split(',')然后使用var pos = arr.indexOf('3');
回答by Nathan MacInnes
This'll do it:
这样做：
var val = $('myinput').val()
val = ',' + val.replace(', ',',').replace(' ,',',').trim() + ','; // remove extra spaces and add commas
if (val.indexOf(',' + mySearchVal + ',' > -1) {
// do something here
}
And it makes sure start and end spaces are ignored too (I assume that's what you want).
并且它确保开始和结束空格也被忽略（我认为这就是你想要的）。
