I am using session variable to keep track of items in the cart. I generate a table using loop to display contents of the cart. The code for table is as follow: I am having problem with + and – buttons within a tags. I want to increment or decrement value in input field named quantity. But since i am
Tag: javascript
How to make Mongoose not insert empty array or object fields into a document
Let’s say we have a Mongoose schema in our Node.js project: And let’s we have an according object: Now to save this data into MongoDB we can use this code: Ok, while it’s all cool. But if data does not contain field_3 (array field, and the same will be for an object field) Mongoose will anyw…
Startswith function for searching an array
I have a function that is giving me some trouble. The code below returns the error message “Cannot read property ‘value’ of undefined”. The function should just search through the values in the accountlist and return the one that starts with the submitted string. In the example, submit…
Webpack throws error when trying to use ts-loader
I’ve looked at all the Google results regarding this issue, but can’t find any reason why it won’t work in my case. I get this error: This is my webpack.config.js: My tsconfig.json: For some reason, the TypeScript syntax is considered invalid and therefore the bundle won’t be created. …
In javascript, can I lock a var?
Here is the scene about my problem. I make a var dataCache, which buffers the data I achieve from remote server. I update dataChache every 30s, like this, and dataCache probably would be accessed exactly at the same time when it’s being updated. For example, the code above runs while the data updating c…
error in unit test vue.js karma (webpack): undefined is not a constructor
I’m using the webpack template generated by Vue’s CLI and have been trying to add some unit tests. And example has already been provided and it works perfectly: Then I try to add another test which I copied straight from Vue’s documentation (Documentation link) but something weird happened: …
React-Native modules for Android int value returned late?
I have a native Android app that now has a React-Native part to it. In short, i have a list view in native Android/Java. When i tap a row, i start a new Activity which leads to the React-Native code. The components make an API call, but before it does it, my code goes through the React Native module to
Close the modal when user clicks outside the modal
The ‘id03’ seems working when user clicked outside of the modal then it will close, while ‘id02’ and ‘id01’ didnt works. User clicked outside the modal then nothing happens Is there something that i missed? Basically ‘id01’, ‘id02’, ‘id03’…
How are the JavaScript Arrays internally resizing?
I’ve been trying to implement a collection type of class (similar to List found in C#) in JavaScript that has some custom functionalities. I also wanted it to be somewhat optimized (I’ve read some articles on how to properly use JavaScript Arrays). I thought to myself “if we don’t defi…
How to render a vertical line when the mouse cursor is on the chart using highcharts?
I have been working on a web application which used Highcharts for charting data. As such, one of the requirement is that when I hover my mouse on the chart (screenshot below – assuming the arrow is the mouse cursor), a vertical line will automatically display of where the mouse cursor was. Aside from t…