Tips for extracting <span> element values from an array and saving them in a new array using Javascript

I have a list of countries with unique identifiers attached to them using a <span> element. Here is an example:


var countryList = [
    'Asia <span class="hide">1234</span>', 
    'Ireland <span class="hide">65dhh</span>', 
    'US West<span class="hide">323-hth</span>', 
    'Asia Pacific <span class="hide">ap-ss-1</span>', 
    'US West <span class="hide">us-323223-1</span>'
]
    

The values inside the <span> represent unique IDs for each country. I am trying to extract only these IDs and create a new array. For instance, the desired output would be:


var newArray = ["1234, 65dhh, 323-hth, ap-ss-1..."];
// I attempted to use the split function but it returned undefined

newArray.push(record[0].getValue().forEach(function(e){e.split('<span class="hide">')})
    

Any suggestions on how to achieve this? Thank you.

Answer №1

Here's one potential solution:

Using the array.reduce method, you can iterate over each element and extract text enclosed within <span> tags using a regular expression.

The reason for utilizing reduce is due to the uncertainty of every element containing a <span> tag. Alternatively, a map function could be employed if all elements are guaranteed to include this tag.

Answer №2

Include the map function in the list of potential solutions using the same regular expression pattern.

var array = [
    'Asia <span class="hide">1234</span>', 
    'Ireland <span class="hide">65dhh</span>', 
    'US West<span class="hide">323-hth</span>', 
    'Asia Pacific <span class="hide">ap-ss-1</span>', 
    'US West <span class="hide">us-323223-1</span>'
];

var newArr = array.map(val => {
  return val.match(/<span class="hide">(.*?)<\/span>/)[1];
});

console.log(newArr);

Answer №3

Here is a helpful suggestion for your code:

// Function to extract text from HTML nodes based on a provided selector:
const getTextFromNode = (htmlString, nodeSelector) => {

  // Create a temporary element to hold the provided HTML string:
  let tempElement = document.createElement('div');

  // Set the innerHTML of the created element to the htmlString:
  tempElement.innerHTML = htmlString;

  // Convert the result of querySelectorAll() into an Array and map over it:
  return Array.from(tempElement.querySelectorAll(nodeSelector)).map(

    // Return the trimmed textContent of each node in the Array:
    (node) => node.textContent.trim()
  );
}

let elements = [
    'Asia <span class="hide">1234</span>',
    'Ireland <span class="hide">65dhh</span>',
    'US West<span class="hide">323-hth</span>',
    'Asia Pacific <span class="hide">ap-ss-1</span>',
    'US West <span class="hide">us-323223-1</span>'
  ],

  // Map over the array of strings and extract text using getTextFromNode():
  ids = elements.map(
    (html) => {
      return getTextFromNode(html, '.hide');
    })
  // Flatten the resulting Array using reduce():
  .reduce((current, accumulator) => {
    return accumulator.concat(current);
  }, []);

console.log(ids);

This method avoids using regular expressions and instead relies solely on the DOM API to accurately retrieve text from specified nodes.

Additional Resources:

Answer №4

To generate the necessary array, you can apply a regular expression mapping to each element in the original array:

const array = [
  "Asia <span class='hide'>1234</span>",
  "Ireland <span class='hide'>65dhh</span>",
  "US West<span class='hide'>323-hth</span>",
  "Asia Pacific <span class='hide'>ap-ss-1</span>",
  "US West <span class='hide'>us-323223-1</span>"
];

const newArray = array.map(item => item.replace(/.*<span.*>(.*?)<\/span>/, '$1'));

console.log(newArray);

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