极客观点
项目管理
HarmonyOS
先在textarea输入文字，FileReader文件就会读取不出来。
如果不输入文字就没有问题
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文本框</title>
<style>
textarea{
width: 50%;
overflow: auto;
word-break: normal;
wrap="physical"
}
</style>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" src="app.js"></script>
</head>
<body>
<input type="file" name="file" id="filePickerOne" multiple/>
<input type="button" value = "显示" onclick="show()"/>
<textarea class="textareaOne" placeholder="Your input" disabled="disabled">
</textarea>
<div id="open_button"><span><< 展开</span></div>
<script type="text/javascript">
var textAreasOne = document.getElementsByClassName('textareaOne')[0];
var spanWord = document.getElementsByTagName('span')[0];
document.getElementById('open_button').addEventListener('click',function(){
if(textAreasOne.scrollHeight > textAreasOne.offsetHeight){
textAreasOne.style.height = textAreasOne.scrollHeight + "px";
spanWord.innerHTML = "<< 收起"
}else{
textAreasOne.style.height = '40px';
spanWord.innerHTML = "<< 展开"
}
})
function show()
{
var reader = new FileReader();
reader.onload = function()
{
var readerResult = reader.result;
textAreasOne.textContent = readerResult;
textAreasOne.disabled = false;
}
let f = document.getElementById("filePickerOne").files[0];
reader.readAsText(f);
}
</script>
</body>
</html>
html5
https://codepen.io/jackpan/pe...
将
textAreasOne.textContent = readerResult;改成textAreasOne.value = readerResult;