I’m looking for the fastest way to create formules inside a web page. I thought I found the solution on jsperf in which MathQuill is by far the quickest. After I studied the tests a bit I noticed that the test for MathQuill runs in sync-mode, but it had an async setup. However, if you check the async ch…
Tag: javascript
How to validate input number length with angular?
I want to validate a 9 digits number using angular, this is in my modal : i tried pattern = [0-9]{9}, seems its passing every number that its getting . I want to pass only number 000000000 – 9999999999 , min-max also not working for me. this is what my app adding to this class: thank u ! Answer Have
Convert Blob to binary string synchronously
I’m trying to put image in clipboard when user copies canvas selection: So I thought the right way would be to convert canvas tu dataURL, dataURL to blob and blob to binary string. Theoretically it should be possible to skip the blob, but I don’t know why. So this is what I did: But when the DataT…
How to convert Blob to File in JavaScript
I need to upload an image to NodeJS server to some directory. I am using connect-busboy node module for that. I had the dataURL of the image that I converted to blob using the following code: I need a way to convert the blob to a file to upload the image. Could somebody help me with it? Answer This function
JavaScript registering events handlers externally
I have decided to remove all calls to JavaScript event from the html form elements to an external file. In doing this i registered an event for each item. However access the elements attributes using ‘this’ can no longer be used what I have decided to use is event.target.value for value attribute …
Simple calculator in HTML and JavaScript
I have to write a calculator in HTML. I really can’t find what is going wrong and it does not show the results. I can’t find something wrong can you help? I’m running it in Chrome. JavaScript File and and the HTML: Answer Things to fix: 1) Assign to value, not innerHTML, when referring to an…
Storing an object in state of a React component?
Is it possible to store an object in the state of a React component? If yes, then how can we change the value of a key in that object using setState? I think it’s not syntactically allowed to write something like: On similar lines, I’ve another question: Is it okay to have a set of variables in a …
Convert DD-MM-YYYY to YYYY-MM-DD format using Javascript
I’m trying to convert date format (DD-MM-YYYY) to (YYYY-MM-DD).i use this javascript code.it’s doesn’t work. Answer This should do the magic
Node.js, Express, EJS – Active class on current page in navigation
I’d like to render a ‘current’ class on each of my navigation links depending on which page I’m on in my layout.ejs template. Currently, my express controller index looks like this: And in my layout.ejs I have the following, which I’d like be rendered dynamically. Any ideas of ho…
Increment localStorage value by one
I am working on an attempted log in feature to our application. They fail three times it kicks them out altogether. To keep count of how many times they attempt I thought I would use localStorage because I can easily manipulate it. However, I am having trouble incrementing the value when they fail to authenti…