I need to use JavaScript to simulate the action of clicking buttons. How do I achieve it? Can I achieve it with jQuery? Answer Yes, you can do it with jquery. Use trigger function. Here documentation. Here is sample:
Convert Data URI to File then append to FormData
I’ve been trying to re-implement an HTML5 image uploader like the one on the Mozilla Hacks site, but that works with WebKit browsers. Part of the task is to extract an image file from the canvas object and append it to a FormData object for upload. The issue is that while canvas has the toDataURL functi…
How to remove numbers from a string?
I want to remove numbers from a string: I want to replace the number 1 number and the question mark ?. It can be any number. I tried the following non-working code. Answer Very close, try: replace doesn’t work on the existing string, it returns a new one. If you want to use it, you need to keep it! Simi…
Javascript event firing before action occurs
I am trying to write a script so that when I play an embedded sound object, a picture that I also have embedded will change. The problem is that when I load the page, the Javascript code automatically runs even though I don’t click play (autostart is set to false) on the sound object. Does anyone have a…
JavaScript property access: dot notation vs. brackets?
Other than the obvious fact that the first form could use a variable and not just a string literal, is there any reason to use one over the other, and if so under which cases? In code: Context: I’ve written a code generator which produces these expressions and I’m wondering which is preferable. An…
removeEventListener on anonymous functions in JavaScript
I have an object that has methods in it. These methods are put into the object inside an anonymous function. It looks like this: (there is a lot more code, but this is enough to show the problem) Now I want to stop the event listener in some cases. Therefore I am trying to do a removeEventListener but I can&#…
Make an iFrame trigger the body.onclick event
I have a script that attaches a function to be triggered by the the document.onclick event. The problem is that the page has an iframe in it. When the user clicks on the iframe, the document.onclick event does not trigger the function attached to it. Is there any way to fix this? In rare cases, the iframe may…
Regular expression [Any number]
I need to test for “[any number]” in a string in javascript. how would i match it? Oh, “[” and “]” also need to be matched. so string like “[1]” or “[12345]” is a match. Non match: “[23432” or “1]” So for example: I need to re…
Type checker for JavaScript?
Does anyone know if there’s a good tool for analyzing JavaScript code and detecting type errors? I know that JavaScript itself is weakly and dynamically typed, but it would be really nice if I could have a program that would verify that all my field accesses are sensible and that I don’t try treat…
Javascript Math Object Methods – negatives to zero
in Javascript I can’t seem to find a method to set negatives to zero? -90 becomes 0 -45 becomes 0 0 becomes 0 90 becomes 90 Is there anything like that? I have just rounded numbers. Answer Just do something like or or