What is it that I am missing here so my page switches between these two colors? Thank you ! Answer You’re never changing the value of isBlue, so it’s always false, so you always set white as the background color. Afrer the if/else, invert the flag: E.g.: Side note: “isBlue” seems an od…
Tag: if-statement
How to display different output based on a text box input using Javascript?
I am creating a grading system with a perfect score of 100. The total is automatically calculated depending the score provided and it is read only. Now, I want to show another text box a short remarks based on the total without the submit button. For example, if the grade is 90 and below, the remarks should a…
What’s the performance difference between “skip if condition” and “directly return”?
Is there any performance difference between the following 2 functions: Which one has a smaller execution time? Answer I don’t think there is a performance difference, but the second function is better for readability, because you don’t have to indent. Also you can use !a in the if statement in the…
Why does my test pass, even though it doesn’t meet my logic gate?
I’m working on telephone validator on FCC. For some reason this passes 5555555555. Why does my logic gate pass this number? For context, this isn’t my first attempt at this code. I’ve added multiple statements, nested if statements, and it still doesn’t catch it. Why does this evaluate…
What does return void 0 === i && (i = 3), 0 === i ? ( ..A.. ) : ( ..B.. ) do?
I came to this code but I don’t understand very well what it does.. (..A..) and (..B..) are just other lines of code I haven’t posted. Let’s say if i would have a 0 value, what the function will return? What does “void 0 === i && (i = 3)” do? Specially (i = 3). Does that …
Parsing to Check if NAN Javascript
I have an onclick even set up to take the value of an input and alert if the value is a number. If the value of the input is blank, I am trying to alert it to say “No Number,” however, it seems that even if my input it empty the function returns a statement saying the the “empty” value
Can we write IF statement without else in javascript
I wrote some code to create an simple todo app in angular js. I have the following function code to remove the tasks from the list. Javascript code HTML code I wanted to show a message when there are no tasks in the list. i have achieved this using “if” statement. but i don’t need an else he…
Check if variable is false and not either true or undefined
What’s the best way to check if myvar javascript variable === false or not (it may be undefined as well). would be fine but myvar it could be undefined. Only false value is acceptable, not undefined. Any shorter than if (typeof myvar !== “undefined” && myvar === false)? Answer If the…
If domain specified not equal to then current URL apply this jQuery as well as pages with same domain
The code below only shows <span> on http://example.com/ but wont show <span> on http://example.com/files/target.html so how can I get it to work on all pages with the specified domain? Please help. Answer What you wrote doesn’t work because window.location returns a Location object, which is…
How to negate code in “if” statement block in JavaScript -JQuery like ‘if not then..’
For example if I want to do something if parent element for used element hasn’t got ul tag as next element, how can I achieve this? I try some combination of .not() and/or .is() with no success. What’s the best method for negate code of a if else block? My Code I want to achieve this Pseudo Code: …