When listening for keyboard events, we often need to check for key codes. The key code for Enter button is For example: Finally, the calculator is up and running. Practically, computed properties are variables which their value depends on other factors. Computed properties work like functions that you can use as properties.
But there is a significant difference. Every time a dependency of a computed property changes, the value of the computed property re-evaluates. In this example the value of b will be set to 2. An input is bound to the a variable.
The desired outcome would be to change the value of the binded attribute and immediately update the result of b. But notice here, that it does not work as we would expect. If you run this code and set variable a to 5, you expect that b will be equal to 6. Sure, but it doesn t, b is set to Well, as you might have already thought, b takes the given value from the input a as a string, and appends the number 1 at the end of it.
One possible solution is to use the parsefloat function that parses a string and returns a floating point number. But there is a more neat way. With Vue. To demonstrate a wider picture of computed properties, we are going to make use of them and build the calculator we have already shown, but this time using computed properties instead of methods.
Lets start with a simple example, where a computed property c contains the sum of a plus b. A calculator that can do the four basic operations is the goal, so let s continue building! Since the HTML code will be the same with the calculator we build in the previous section of this chapter except now we don t need a button , I am am going to show only the Javascript codeblock. The only thing we had to do, was to move whatever was inside calculate method to the computed property c!
Whenever you change the value of a or b the result updates in real time! We don t need any buttons, events, or anything. How awesome is that?? Note Note here that a normal approach would be to have an if statement to avoid error of division. But, there is already a prediction for this kind of flaws. If the user types a text the displayed result is not a number. Start by creating an array of Mayor candidates.
Each candidate has a name and a number of votes. Use a button to increase the count of votes for each candidate. Use a computed property to determine who is the current Mayor, and display his name. Finally, add an input. When this input is focused, and key delete is pressed, the elections start from the beginning.
This means that all votes become 0. Hint Javascript s sort and map methods could prove very useful and Key modifiers will get you there. Example Output. Web Studio has three ways. Leanpub empowers authors. Beginning Web Development with Node.
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