我想使用 window.getSelection 制作一个具有粗体功能的 HTML 文本编辑器

Question

It makes the whole text bold. I want only selected text to get bold (Strictly no exec Command)

let boldBtn = document.getElementById('Bold-Btn');
let boldClickListener = (event) =>
{
    event.preventDefault();
    let selection = window.getSelection();
    let final = `<span class="text-bold">${selection.focusNode.textContent}</span>`;
    selection.anchorNode.parentElement.innerHTML=final;
    console.log(selection);
};

boldBtn.addEventListener('click',boldClickListener);

Answer 1

One way of doing this might be to do the following:

• Get the window selection.
• Convert the selection to a string to get the text.
• Create the element that will be bold.
• Replace the selected text contained in the innerHTML of the parentElement with the bolded element.

Example based on the code you provided:

 let boldBtn = document.getElementById('Bold-Btn'); let boldClickListener = (event) => { event.preventDefault(); // Get selection let selection = window.getSelection(); // Get string of text from selection let text = selection.toString(); // Create bolded element that will replace the selected text let final = `<span class="text-bold">${text}</span>`; // Replace the selected text with the bolded element selection.anchorNode.parentElement.innerHTML = selection.anchorNode.parentElement.innerHTML.replace(text, final); }; boldBtn.addEventListener('click', boldClickListener);

 .text-bold { font-weight: bold; }

 <div> Test this text </div> <button id="Bold-Btn"> Bold </button>

Note that you may want to add some more logic when creating your bold element to handle if any existing text is already bold.