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Author: admin@master

Regex for matching HashTags in any language

I have a field in my application where users can enter a hashtag. I want to validate their entry and make sure they enter what would be a proper HashTag. It can be in any language and it should NOT precede with the # sign. I am writing in JavaScript. So the following are GOOD examples: Abcde45454_fgfgfg (good…

how to render multiple children without JSX

How to write this without using JSX? This comes from the react.js tutorial: http://facebook.github.io/react/docs/tutorial.html I know I can do the following: But this only adds one element. How can I add more next to one another. Answer You can use the online Babel REPL (https://babeljs.io/repl/) as a quick w…

jshint Error: Cannot find module ‘underscore’

My grunt task seems to be running perfectly fine, but every time I run it I’m getting this error: Is there any way to find out why this is happening? I can see the /grunt-contrib-jshint directory is in the /node_modules directory. Is there any reason it can’t find the underscore module? I’ve…

Parse.com relations count

I want to query object from Parse DB through javascript, that has only 1 of some specific relation object. How can this criteria be achieved? So I tried something like this, the equalTo() acts as a “contains” and it’s not what I’m looking for, my code so far, which doesn’t work: …

react.js: removing a component

I’m fairly new at react.js, so any help is greatly appreciated. I have this: https://jsfiddle.net/rzjyhf91/ Wherein I have made 2 components: an image and a button. The goal is to remove the image with a click of the button, I use unmountComponentAtNode for that, but it does not work: How can I remove a…

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…