Exploring Typescript: A guide to iterating through a Nodelist of HTML elements and retrieving their values

I'm struggling to retrieve values from a Nodelist of input elements. Can anyone help me out?

let subtitleElements = document.querySelectorAll(
      '.add-article__form-subtitle'
    );

Answer №1

Start by implementing a type guard before looping through all the HTML elements.

If you skip this step, querySelectorAll will return a type union of HTMLInputElement or null, causing TypeScript to throw an error. This is the default behavior of the strict checker.

 let paragraphSubEl = document.querySelectorAll('.add-article__form-subtitle');
    if(paragraphSubEl) {
        paragraphSubEl.forEach(node =>  {   console.log(node.firstChild.nodeValue) })
    }
      

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