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QUESTION
I am a newbie to JS technology. I am taking Javascript Bible as my starting point. That book takes me deep to JS behavior, although some obsolete topics and deprecated functions. A particular code block is not working for me.
I don't know honestly "Is that a deprecated function or browser issue" I've searched addEvent in all resources. Most of the people used addEventListener
now.
I just need to know the difference. How I can possibly fix this code?
What's the reason it returns an error "Uncaught ReferenceError: addEvent is not defined". Where I need to define this addEvent?
...ANSWER
Answered 2019-Jul-19 at 07:59It seems pretty likely that your code was copied from something like the answer here, which defines addEvent
as a DRY way to call addEventListener
if it exists, or to call attachEvent
(a very obsolete method for use in Internet Explorer which does the same thing as addEventListener
):
QUESTION
After I clicked on the 'BEGIN' button, the code produced a ValueError:
File "E:\python\number guess trial2.py", line 58, in clicked4
run_game()
File "E:\python\number guess trial2.py", line 61, in run_game
guess = int(guess_entry.get())
ValueError: invalid literal for int() with base 10: ''
May someone please explain o me why it produced a ValueError?
...ANSWER
Answered 2018-Jul-31 at 06:55Did you try to debug the code? Try printing guess_entry.get() and see if the value is integer. Probably, the compiler is not to parse the value to integer. You can use try-except to handle the ValueError exception.
QUESTION
After clicking the NEXT button, it produces a NameError for l3.destroy()
and NEXT.destroy
. I couldn't think of a reason why it says that l3
and NEXT
is undefined. May someone have a look at my code and explain it to me?
ANSWER
Answered 2018-Jul-26 at 09:37Functions that use global variables need to declare each variable as global explicitly. For example:
QUESTION
If for example a username isn't filled in the user is given an error stating so, but after pressing submit they're thrown to another page with the error.
How would I go around keeping the error on the same page as the registration form and keeping all the text entered by the user after submit?
Registration PHP:
...ANSWER
Answered 2018-Jan-02 at 16:14It depends on at what level do you want to do this.
Validating that the different data is not empty and has information that makes sense (like the password is at least 7 chars long) can be done via javascript before sending the form data, this way you can stop the form to be sent. You can use jQuery Plugin Validator to help you do this.
But other validations like the insert has failed only can be done at server side, if you need also not to redirect in this case then you have to use ajax to load the data and then refresh the website info without reloading it.
I prefer to only do an initial check with javascript and send the user to the results page. But I also keep the validations as this one of the password length in the php because, even though now a days it's really strange, a user can disable javascript and I don't wana have surprises when checking the database values. But, another example, if you have lots of users you could check that the user does not exist to warn the user at the very first moment before the form is sent and this can only be done performing an ajax call.
You should know how to do both things and decide depending on what you want to do on your projects.
In your case, I would leave the php validations as they are now and check the same (non empty values) in javascript on the form submit event calling event.preventDefault() if an error has been detected.
QUESTION
ANSWER
Answered 2017-Jul-02 at 21:15You can use the option: 'padding-top' or 'padding-bottom'
QUESTION
SOLVED - Thank you all for your time
I'm having a little trouble getting this one right. Basically I have two radio buttons with different values and I need to add and remove the class "active" from div's that pertain to the value of the radio button. See my code below:
HTML:
...ANSWER
Answered 2017-May-15 at 18:08$("input[name=phoneOrWeb]:radio").change(function () {
if ($(this).val() == "phone") {
$('#web').removeClass('active');
$('#phone').addClass('active');
} else if ($(this).val() == "web") {
$('#web').addClass('active');
$('#phone').removeClass('active');
}
});
QUESTION
I have two tables, JobRequest and WorkOrder. The Primary Key for JobRequest is a varchar field named RequestNumber. There is also a field, of the same name as the foreign key in the work order table. There is a 0 to 1 relationship between the tables on that field; when a job request can't be completed by the organic maintenance team, a work order is issued for another maintenance team.
The databases look a bit like:
JobRequest
...ANSWER
Answered 2017-Mar-16 at 20:08The following design represents the provided sample database schema:
Model:
QUESTION
I'm trying to make this table be center with my navbar, this is what it looks like right now https://9.lithi.io/EodUht.png
Any help would be appreciated. Thanks in advance!
(I'm very very new to html/css obviously)
...ANSWER
Answered 2017-Jan-03 at 15:29Make sure you put the
eight columns
class within a
with the class row
applied as you have done with the other contents.
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