html focus 引来 类似微博的效果
日期：2014-05-17 浏览次数：20634 次
html focus 引入 类似微博的效果
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>无标题文档</title>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<label>
<textarea name="test1" id="test1" cols="45" rows="5">这是默认内容，嘿嘿，测试一下!</textarea>
<br/>
<br/>
<input name="tag" type="text" id="tag" value="AAA"/>
<br/>
<br/>
<a href="javascript:void(0);"
onclick="insertAtCursor(document.getElementById('test1'), document.getElementById('tag').value);">插入</a>
</label>
</form>
</body>
</html>
<script type="text/javascript">
function insertAtCursor(myField, myValue) {
if (document.selection) { //IE support
myField.focus();
sel = document.selection.createRange();
sel.text = myValue;
sel.select();
}
else if (myField.selectionStart || myField.selectionStart == '0') { //mozilla/netscape support
var startPos = myField.selectionStart;
var endPos = myField.selectionEnd;
var restoreTop = myField.scrollTop; // save scrollTop before insert
myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
if (restoreTop > 0) { // restore previous scrollTop
myField.scrollTop = restoreTop;
}
myField.focus();
myField.selectionStart = startPos + myValue.length;
myField.selectionEnd = startPos + myValue.length;
} else {
myField.value += myValue;
myField.focus();
}
}
</script>
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