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".
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
}
.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)
I would use a regex
if (string.match(/chicago/i)) {...}
it's case insensitive
Related
I want to trigger a digital marketing tag on every page which falls under a particular URL path, say example.com/sachin under the sachin directory.
I've tried if (location.href === 'example.com/sachin.*/') but somehow the condition doesn't seem to work.
What will be the correct if condition for location.href if I want to cover all different resources with in the URL path say under sachin directory?
I presume you want to check if the URL contains example.com/sachin. It's highly rarely that any URL ever would contain 4 forward-slashes but what you would do is utilize indexOf.
if(location.href.indexOf("example.com/sachin/") != -1){
//Do something
}
This basically says, if "example.com/sachin/" is found somewhere in the given string(in location.href in this case) on an indexposition that is not -1(which means that it doesn't exist), then execute.
You need to use Regular Expressions to match needed resources.
Something like that:
if(location.href.match(/^http:\/\/example.com\/sachin\//)){
//your staff here
}
Another approach to check for a specific directory in a url.
function urlContains(url, value) {
return ~url.indexOf(value);
}
if (urlContains(location.href, "/sachin/")) {
// found
} else {
// not found
}
The indexOf method checks a string for the value that is passed and returns -1 if a result was not found.
Instead of checking for == -1 or != -1 you can use the Bitwise NOT operator ~ to convert -1 to 0, which is a falsy value, non-zero values are treated are truthy values in javascript.
Basically what I'm trying to do is write a greasemonkey script so that if a link on a page is not a link I have on an ignore list to just open the link, if it is on the list then reload the page after 5 seconds here is what I tried so far
var url1 = $("span.capsulelink a:eq(0) ").attr("href");
var ignoreList = ["example1.com","example2.com"]
if (url1 !== ignoreList) {
window.open(url1);
} else {
setTimeout(function() {
location.reload();
},5000);
}
I know it's the (url1 !== ignoreList) part I am having trouble with, I just can not seem to find the right expression for that. Like I do not know how to say if url1 is not on the ignoreList {do something}.
ignoreList.indexOf(url1) !== -1
This is another way of saying "is url contained in the ignoreList array?"
This is because the indexOf() method of Array returns the index of the element you're looking for, or -1 if the element doesn't exist.
To negate this, which is what you want to do, you write:
ignoreList.indexOf(url1) === -1
(i.e. is url1 not in ignoreList?)
This is a good question, because the answer really isn't intuitive.
When you're starting to learn javascript, some of the syntax patterns begin to look familiar.
But the javascript equivalent of PHP's
if (!in_array([ARRAY]));
simply isn't obvious at all - this is one syntax you just need to know.
Here is the javascript you're looking for:
if (ignoreList.indexOf(url1) !== -1) {
[RELOAD PAGE CODE HERE]
}
else {
[OPEN THE LINK CODE HERE]
}
Here's why it works:
ignoreList.indexOf([VALUE]) looks through the ignoreList array and searches through the array's items.
If one of those items is [VALUE], it returns the index of that item.
Importantly, if none of the items are [VALUE] it returns -1.
So, in order to establish that at least one of the items is [VALUE], you have to verify that the returned index definitely isn't -1.
Consequently the condition you need to check for is:
if (ignoreList.indexOf(url1) !== -1)
if(kword == term){
$(this).trigger('click');
}
The case is if the kword is "car" and the term is "cars", I would want that to be a positive match.
Currently I'm looking at an exact match. As I'm a novice at jquery I don't know how to do this. Can anyone point me to the right direction?
You can use indexOf() to find the string inside another
if(term.indexOf(kword)>-1){
//code
}
If you need to simply compare a string variable with a different string variable with an 's' in the end, you can go with following code:
if (term === kword + 's') {
...
}
If you need to check specifically if terms is a plural version of kword, you would need much larger implementation, featuring pluralize function (that you need to implement or search for a library):
if (term === pluralize(kword)) {
...
}
function pluralize(word) {
//implement function
}
If that doesn't not answer your question, please be more clear about what you need to do.
As #Anton said, you can use indexOf(), it returns the position of the first occurrence of a specified value in a string otherwise returns -1 if the value to search for never occurs. Also note that this method is case sensitive.
I found many option of checking if the URL contains some text but I am trying to do the opposite.
How can I start a function if the URL DOES NOT contain 'text'?
Here is what I started with that does fire the function but only if the url contains it:
if (document.location.href.indexOf('text') > -1){
alert('URL should not have "text" in it');
}
I tried adding a '!' and a 'NOT' in front of the '(document...' but I guess that's not it.
if (document.location.href.indexOf('text') === -1){
alert('URL should not have "text" in it');
}
if(document.URL.indexOf("YourText") <= -1){
"Check"
}
It's better to use document.location.pathname.includes('text') simple reason it won't be maintaining the index returned and will be a simple boolean true/false in case of includes
In your case simply :-
if(!document.location.pathname.includes('text')){
//You condition Code goes here
}
Note:- You can always use /text or /text/ instead of test if you know the text will come in the middle of an URL to make it better as othertext will become false in that case.
I'm trying to search for all elements in a web page with a certain regex pattern.
I'm failing to understand how to utilize Javascript's regex object for this task. My plan was to collect all elements with a jQuery selector
$('div[id*="Prefix_"]');
Then further match the element ID in the collection with this
var pattern = /Prefix_/ + [0 - 9]+ + /_Suffix$/;
//Then somehow match it.
//If successful, modify the element in some way, then move onto next element.
An example ID would be "Prefix_25412_Suffix". Only the 5 digit number changes.
This looks terrible and probably doesn't work:
1) I'm not sure if I can store all of what jQuery's returned into a collection and then iterate through it. Is this possible?? If I could I could proceed with step two. But then...
2) What function would I be using for step 2? The regex examples all use String.match method. I don't believe something like element.id.match(); is valid?
Is there an elegant way to run through the elements identified with a specific regex and work with them?
Something in the vein of C#
foreach (element e in
ElementsCollectedFromIDRegexMatch) { //do stuff }
Just use the "filter" function:
$('div[id*=Prefix_]').filter(function() {
return /^Prefix_\d+_Suffix$/.test(this.id);
}).each(function() {
// whatever you need to do here
// "this" will refer to each element to be processed
});
Using what jQuery returns as a collection and iterating through it is, in fact, the fundamental point of the whole library, so yes you can do that.
edit — a comment makes me realize that the initial selector with the "id" test is probably not useful; you could just operate on all the <div> elements on the page to start with, and let your own filtering pluck out the ones you really want.
You can use filter function. i.e:
$('div[id*="Prefix_"]').filter(function(){
return this.id.match(/Prefix_\d+_Suffix/);
});
You could do something like
$('div[id*="Prefix_"]').each(function(){
if($(this).attr('id').search(/do your regex here/) != -1) {
//change the dom element here
}
});
You could try using the filter method, to do something like this...
var pattern = /Prefix_/ + [0 - 9]+ + /_Suffix$/;
$('div[id*="Prefix_"]').filter(function(index)
{
return $(this).attr("id").search(pattern) != -1;
}
);
... and return a jQuery collection that contains all (if any) of the elements which match your spec.
Can't be sure of the exact syntax, off the top of my head, but this should at least point you in the right direction