+ 8

Why the output is 33 not 6?

When Sum button is clicked, alert Window will appear. https://code.sololearn.com/WuTa4N7pOT71/?ref=app

27th Dec 2018, 4:43 AM
Muhd Khairul Amirin
Muhd Khairul Amirin - avatar
22 Respuestas
+ 4
https://code.sololearn.com/W0uk4VD12ALx/?ref=app
27th Dec 2018, 5:07 AM
ShortCode
+ 4
Best way to debug this code is checking type of things you are adding. Add following code to your function console.log(typeof(a)); console.log(typeof(b)); This tells a and b are string so they concatenate. So you are actually doing this "3"+"3"=33. Solution: coerce (change to another data type) those two inputs that are initially string type into number type by using parseInt() function.
27th Dec 2018, 5:09 AM
Prathamesh Sawant
Prathamesh Sawant - avatar
+ 4
Because you added it.
28th Dec 2018, 9:51 AM
Sandakan Nipunajith
Sandakan Nipunajith - avatar
+ 3
Try var sum=+a+ +b;
27th Dec 2018, 5:12 AM
Calviղ
Calviղ - avatar
+ 3
Thanks everyone😄
27th Dec 2018, 9:34 AM
Muhd Khairul Amirin
Muhd Khairul Amirin - avatar
27th Dec 2018, 12:30 PM
Claude Martin
Claude Martin - avatar
+ 3
Looks like someone had downvoted this questions as well as its answers. 😓
28th Dec 2018, 3:51 AM
Muhd Khairul Amirin
Muhd Khairul Amirin - avatar
+ 3
You need to convert a and b to numbers otherwise you're just concatenating two strings together.
28th Dec 2018, 5:21 PM
Dave David
Dave David - avatar
+ 3
The value is retrieved as a string that's why
14th Feb 2019, 1:59 AM
👑 Prometheus 🇸🇬
👑 Prometheus 🇸🇬 - avatar
+ 2
Calvin is it really good practice using that?
27th Dec 2018, 5:53 AM
Prathamesh Sawant
Prathamesh Sawant - avatar
+ 2
The Learner the reason why your code has an error is caused when you try to add a 'addEventListener' method to the input tag with id 'cal'. When you do this the input tag with id 'cal' doesn't exist yet, the body hasn't loaded it and it's children, but your javascript is trying to get the values regardless and so null is returned for the variable cal. What you should do is run the javascript after all the elements that you need in the html have loaded. <body onload="onloadMethod();"> </body> function onloadMethod(){ Initialise all variables in here }
28th Dec 2018, 10:18 PM
Dave David
Dave David - avatar
+ 2
♣Dave♠David♣ Yeah at least I'm gonna see the result with that ... thanks for help though 😄
28th Dec 2018, 10:30 PM
Edwing123
Edwing123 - avatar
28th Dec 2018, 11:23 PM
ShortCode
+ 2
ShortCode 😊 thank you
28th Dec 2018, 11:29 PM
Edwing123
Edwing123 - avatar
+ 1
Hahaha funny tricky fact about input type ="number", they are still string
28th Dec 2018, 9:43 PM
Edwing123
Edwing123 - avatar
+ 1
If you wanna prevent user to use letter or any other character but not a number you can use the isNaN function, I found it useful with my code: https://code.sololearn.com/WnLYR0lI6Ez6/?ref=app Note: if somebody sees my code plz tell me why is showing me that error !! :)
28th Dec 2018, 9:47 PM
Edwing123
Edwing123 - avatar
+ 1
♣Dave♠David♣ but why in my computer works? edited: not SL but in my local or if I open it in a browser.
28th Dec 2018, 10:22 PM
Edwing123
Edwing123 - avatar
+ 1
The Learner i'm sorry i don't understand
28th Dec 2018, 10:23 PM
Dave David
Dave David - avatar
+ 1
♣Dave♠David♣ well ... I created the code in my computer but not directly in Sololearn ... I created in brackets text editor, the page resulted ok everything. working.. but two days ago I uploaded to SL and it shows me that error ....
28th Dec 2018, 10:26 PM
Edwing123
Edwing123 - avatar
+ 1
Remove value=3 in both places and run the code
30th Dec 2018, 4:41 PM
Madhuri
Madhuri - avatar