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returns the index where pattern starts in string (or -1 if not found).
The search is to be case sensitive if the 3rd parameter is true otherwise it is case insensitive.
Examples
index("abAB12","AB",true) returns 2 but index("abAB12","AB",false) returns 0
index("abAB12","BA",true) returns -1 and index("abAB12","BA",false) returns 1
Maybe something like:
var str = "abAB12";
var i = str.indexOf("AB");
if (i < str.length / 2) {
//stuff
} else {
//other stuff
}
Related
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I want to get only the value of "vp" from the query string only if it is between 0-4. If it is bigger (for example: 5, 12 etc.) I want to get undefined.
"?vp=324" // ==> undefined
"?vp=1&mn=345" // ==> 1
"?mn=345&vp=2" // ==> 2
"?sf=23&vp=12&fd=343" // ==> undefined
May or may not need to parseInt for this.
function smallVP(queryString) {
let params = new URLSearchParams(queryString);
let vp = parseInt(params.get("vp"), 10);
if (vp >= 0 && vp <= 4) {
return vp;
}
}
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I have only one number like "100000"
I wan't to split this number same as [20000,20000,20000,20000,20000] in array
so if number is 138000 then it should be like [20000,20000,20000,20000,20000,20000,18000]
How to do this?
let num = 118000,
num_array = [];
while (num > 0) {
if (num >= 20000) {
num_array.push(20000);
num -= 20000;
} else {
num_array.push(num);
break;
}
}
console.log(num_array);
I think this is what you want, please post what you tried, so that it helps to understand where you failed.
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I need to find an element that's text value is 0.
I do:
var d = $('.content').find('div');
if(d.text().length === 0){
//do something
}
Is there a way to put the above logic in the selector?
I've tried:
var d = $('.content').find('div:empty');
But no luck as the div may have other empty html tags in.
Use a filter
var elems = $('.content').find('div').filter(function() { return $(this).text() == 0 });
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I do not have any JavaScript experience and would like some assistance in creating a function as I am not sure on how to do it.
I would like to create a Function that validates that x between 1 and 17 it can also be equal to 1 and 17
If the value is not valid a simple messagebox/alert could be used to notify the user
I know this is a really stupid question but thank you in advance
A function like that would look something like:
function validateNumber(n) {
var ok = n >= 1 && n <= 17;
if (!ok) alert('The value is not valid. Values from 1 to 17 are allowed.');
return ok;
}
You can call it, and you get the status back if you want to use it for something:
if (validateNumber(x)) {
// the number was valid
} else {
// the number wasn't valid
}
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how would I check for string
<something> in var string = "some chars <something> somechars"
You can use String.match():
var res = string.match(/<something>/g); // ["<something>"]
If there is no match, the value of res will be null. See example on JSFiddle.