我想使用jQuery的包含选择器

Question

I have a variable [ITEM_NAME] that stores an item name from a shopping cart. I want to check whether the value in [ITEM_NAME] is like one of the following strings:

"CHICAGO NEW"
"CHICAGO OLD"
"CHICAGO TEXT"
"CHICAGO PURE"

In pseudocode:

if ([ITEM_NAME].contains("CHICAGO"))

I want a condition that will be satisfied for all strings that start with "CHICAGO".

Answer 1

This has nothing to do with jQuery selectors. Simply use the indexOf method to find whether the string stored in your variable contains the substring "CHICAGO":

if (yourString.indexOf("CHICAGO") !== -1) {
    //do something
}

If you want to check whether the string starts with the text "CHICAGO", you can use:

if (yourString.indexOf("CHICAGO") == 0) {
    //do something
}

You can read more about indexOf here .

EDIT: In your comments to Derek's answer, you mentioned that matching should be case insensitive (although this information isn't present in the question). If that is the case, simply use:

if (yourString.toUpperCase().indexOf("CHICAGO") == 0) {
    //do something
}

Answer 2

.contains() checks to see if an element is a direct descendent of another DOM element. It is not useful at all for what you are trying to do.

You should use .indexOf() .

If you need your test to be case-sensitive:

if ([ITEM_NAME].indexOf('Chicago') === 0)

Otherwise, if it needs to be case-insensitive:

if ([ITEM_NAME].toUpperCase().indexOf('CHICAGO') === 0)

Answer 3

if (string.match(/chicago/i)) {...}不区分大小写，我会使用一个正则表达式