Angular 6 - ERROR TypeError: Cannot read property 'value' of undefined

-

 I can't belive that a single   '?'    ruined my day that's why i'm creating this post . i'll try to make this as simple as i can.

This happens becuse one of your object does'n have the value untill the API response arrives.So use  ? to check untill the response arrives

for example:

question: this.pollForm.get("question")?.value

Comments

Post a Comment

Popular posts from this blog

VS CODE UNABLE TO CHANGE USER SETTINGS - HOW TO FIX IT

-
Image
 Most of  you have ran into this issue .today i'm going to show you how to fix this.  lets roll !!!!!!! 1.use ctrl+p to enable search bar in your vs code 2.type this in your searchbar "> Open settings"   3.Select "preferences:open settings (JSON)"       4.Clear everthing in that file and save it               5.Restart your pc                                                  that's it you are ready to go                                                                                  
Read more

Day 2: Loops :- 10 Days Of Javascript HackerRank Solution

-
Image
  Day 2: Loops :- 10 Days Of Javascript HackerRank Solution  Objective In this challenge, we practice looping over the characters of string. Check out the attached tutorial for more details. Task Complete the  vowelsAndConsonants  function in the editor below. It has one parameter, a string,  , consisting of lowercase English alphabetic letters (i.e.,  a  through  z ). The function must do the following: First, print each  vowel  in   on a new line. The English vowels are  a ,  e ,  i ,  o , and  u , and each vowel must be printed in the same order as it appeared in  . Second, print each  consonant  (i.e., non-vowel) in   on a new line in the same order as it appeared in  . Input Format Locked stub code in the editor reads string   from stdin and passes it to the function. Output Format First, print each  vowel  in...
Read more

Node.js module not found error -how to fix it

-
Image
 Most of the tenderfoots have ran into this error. when you install node.js for the first time and put npm install to your IDE'S terminal you'll see an error message telling you that 'module not found' .im going to show you how to fix this .it's simple lets roll!!!!                     we have to fix npm path for this Use the global Search option to search "Environment Variables" Click "Edit system environment variables" Click "Environment Variables" in the dialog. In the "System Variables" box, search for Path and edit it to include  C:\Program Files\nodejs . Make sure it is separated from any other paths by a  ; . Now all you have to do is restart your pc and you're ready to go
Read more