无法运行document.execCommand（'copy）; 用Java语言编写

Question

I'm trying to select and copy text from an html <textarea> element, but using document.execCommand('copy'); displays an error stating that .execCommand('copy') is not a function. . I did also say myTextElement.select(); before I ran the copy command. (And I am also using jQuery).

So as you know, I have a <textarea> element with an id="txtMyTextElement" tag. I also have an anchor element which has a click event which runs a function like this:

    $('#txtMyTextElement').select();

    let result = document.execCommand('copy');
    if (result === 'successful') {
        alert('Text copied!');
    }
    else {
        alert('Copy Failed!');
    }

When I click my anchor element it gives me the error: .execCommand('copy') is not a function . I might be missing something, but any help to fix this issue so I can copy text inside my <textarea> element would be much appreciated.

Answer 1

While your code doesn't seem to be throwing a "is not a function" error, you do have another issue.

Your issue seems to be with === "successful" . This will never be true . Instead, document.execCommand('copy'); returns a boolean ( true or false ) and so result will either be equal to true or false :

 $("#btn").click(function() { $('#txtMyTextElement').select(); let result = document.execCommand('copy'); if(result) { // check if result == true alert('Text copied!'); } else { alert('Copy Failed!'); } }) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <input type="text" id="txtMyTextElement" /> <button id="btn">Copy Text</button>