Javascript hide select option based on value

To show a hidden div when a select option is selected, you can set the value “style.display” to block.

Example

Following is the code −

Document










This is the Javascript

To run the above program, save the file name anyName.html(index.html) and right click on the file. Select the option “Open with live server” in VS Code editor.

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This destructing can also be used inside of a loop, so you could then structure your provinces like so using array literals

const provinces = [
  ['AB', 'Alberta'],
  ['BC', 'British Columbia'],
  ['MB', 'Manitoba'],
  ['NB', 'New Brunswick'],
  ['NL', 'Newfoundland']
]

Here I am using a for…of loop to log out the alpha codes and province names.

for (const [alphaCode, province] of provinces) {
  console.log(alphaCode + ' - ' + province)
}

/* Outputs
AB - Alberta
BC - British Columbia
MB - Manitoba
NB - New Brunswick
NL - Newfoundland
*/

You can hopefully see that destructuring provides a clearer alternative to using indexes e.g. provincesArray[1][i] and

const [breakfast, lunch, dinner] = ['cornflakes', 'sandwich', 'bolognese']
console.log(breakfast) // 'cornflakes'
console.log(dinner) // 'bolognese'

In addition if you use ‘let’ or ‘const’ to define your variables you can take advantage of block scope

You could then remove these two lines

var newOption;
var newTextNode;

And define the variables inside of your loop instead. By using const here, we get an entirely new variable definition for each iteration of the loop.

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