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Best way to add comments in erb
How do we add comments in erb files, if we do not want them to be generated into the html content?
7 Answers
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jQuery equivalent of getting the context of a Canvas
...the element from .get(0) may not fail so silently... You can easily check if the canvas was found first before .get(0) like
if( $("#canvas").length ) ctx = $("#canvas").get(0).getContext('2d');
else console.log('Error: Canvas not found with selector #canvas');
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Border in shape xml
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If you want make a border in a shape xml. You need to use:
For the external border,you need to use:
<stroke/>
For the internal background,you need to use:
<solid/>
If you want to set corners,you need to use...
How to select/get drop down option in Selenium 2
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deselectAll will throw an UnsupportedOperationException if the select does not support multiple selections
– Tom Hartwell
Mar 20 '13 at 19:42
4
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Remove Primary Key in MySQL
...property before dropping the key:
ALTER TABLE user_customer_permission MODIFY id INT NOT NULL;
ALTER TABLE user_customer_permission DROP PRIMARY KEY;
Note that you have a composite PRIMARY KEY which covers all three columns and id is not guaranteed to be unique.
If it happens to be unique, you c...
How to Remove Array Element and Then Re-Index Array?
I have some troubles with an array. I have one array that I want to modify like below. I want to remove element (elements) of it by index and then re-index array. Is it possible?
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How to concatenate multiple lines of output to one line?
If I run the command cat file | grep pattern , I get many lines of output. How do you concatenate all lines into one line, effectively replacing each "\n" with "\" " (end with " followed by space)?
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Do you have to put Task.Run in a method to make it async?
...n async method, those "yield" points are await expressions.
This is very different than the term "asynchronous", as (mis)used by the MSDN documentation for years to mean "executes on a background thread".
To futher confuse the issue, async is very different than "awaitable"; there are some async m...
How to commit no change and new message?
How can I make a new commit and create a new message if no changes are made to files?
5 Answers
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Express.js - app.listen vs server.listen
This may be a very basic question but I simply don't get it. What is the difference between creating an app using Express.js and starting the app listening on port 1234, for example:
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