Working with Nodejs and MongoDB through Node MongoDB native driver. Need to retrieve some documents, and make modification, then save them right back. This is an example: With asynchronous nature, if the process of updating the document takes longer, then when cursor reaches the end of documents, database con…
How to make a text flash in html/javascript?
I know flashing text is banned at many places but still as my client requires it, I need to flash one line of text using HTML, JavaScript which ever is feasible. I would like the text to appear and disappear within seconds and continue this cycle. I know text-decoration:blink in CSS can do this but it only wo…
How can I hide the Android keyboard using JavaScript?
I would like to hide the Android virtual keyboard in JavaScript. Someone suggested doing this: But this doesn’t work if the keyboard is already visible. Is this something that can be done? Answer What you need to do is create a new input field, append it to the body, focus it and the hide it using displ…
How to move an iFrame in the DOM without losing its state?
Take a look at this simple HTML:
Let’…
Backbone and jQuery events
I have a simple task – retrieve click listener function from DOM element. I’ve fased two problems: I have no idea how to obtain event listener, that was set via addEventListener function $(element).data(‘events’) is always empty Talking about first problem – I think it’s no…
In Javascript, what does this underscore mean?
I’m reading a tutorial on backbone.js here: http://addyosmani.com/blog/building-spas-jquerys-best-friends/ What are the underscores? (_index, _photos, _album) Why use them? Answer It means private fields or private methods. Methods that are only for internal use. They should not be invoked outside of th…
Backbone js: register view events on parent element
I’d like to register view events on the view parent element. I tried the parent selector: But it is not working. How can I achieve this? Answer Backbone uses jQuery event delegate, so you can’t delegate events to the parent node. see in Backbone source code line 954, the View.delegateEvents functi…
Registering keyup on Ctrl when used to change tabs in JQuery
I have create a wysiwyg HTML editor. When the user holds down keys down Ctrl, it sets a variable ctrlPressed to true. When the key up event is fired with the Ctrl keycode, then ctrlPressed is set to false. However, when the user presses Ctrl+PgUp to change tabs, there is no way for ctrlPressed to be set to fa…
Printing a web page using just url and without opening new window?
I am using this script to print a webpage. My views render this page and The JS take care all other things. But I dont want to open new window for that. So, What should I use instead of window.open(URL) so no new window opens. Similarly, I don’t want to open new window for print function.So, Whenever I …
How to parse Excel (XLS) file in Javascript/HTML5
I am able to read Excel file via FileReader but it outputs text as well as weird characters with it. I need to read xls file row-wise, read data in every column and convert it to JSON. How to read xls file row by row? Answer Below Function converts the Excel sheet (XLSX format) data to JSON. you can add