如何在具有 maxLength 属性的输入中获取所有粘贴的字符串？

Question

I need to get all of the pasted string in input which has a maxLength attribute.

But in 'onpaste' event there is no property to get all of the pasted string.

For example, check below snippet with this string:

"AAAAA-BBBBB-BBBBB-BBBBB-BBBBB"

The output is: "AAAAA"

But I need all of the string.

 const onPasteFn = (e) => { setTimeout(() => document.getElementById("demo").innerHTML = e.target.value, 0) }

 <input type="text" maxLength="5" onpaste="onPasteFn(event)" /> <p id="demo"></p>

Answer 1

Consider using clipboardData from the event, where you can use getData() to grab the text that was pasted from the clipboard like so:

 const onPasteFn = (e) => { document.getElementById("demo").textContent = (e.clipboardData || window.clipboardData).getData('text'); }

 <input type="text" maxLength="5" onpaste="onPasteFn(event)" /> <p id="demo"></p>

See example here from the docs. Note that the fallback of || window.clipboardData|| window.clipboardData is used for IE support.

Answer 2

You can access clipboardData through function getData() , and print it instead of e.target.value() . If you store it in a temporary variable, like I did in my example, you are able to perform further elaboration on the pasted string.

It works for reasonably recent versions of browsers (for example FF 22+ ).

 const onPasteFn = (e) => { var myData = e.clipboardData.getData("text/plain"); setTimeout(() => document.getElementById("demo").innerHTML = myData, 0) }

 <input type="text" maxLength="5" onpaste="onPasteFn(event)" /> <p id="demo"></p>

Answer 3

Set a higher maxLength if the pasted string is expected to be larger. Your sample input string has length 29. So here is modified code with maxLength=30 .

 const onPasteFn = (e) => { setTimeout(() => document.getElementById("demo").innerHTML = e.target.value, 0) }

 <input type="text" maxLength="30" onpaste="onPasteFn(event)" /> <p id="demo"></p>