在html文本框中设置键盘插入符号的位置

有人知道如何移动文本框中的键盘插入符号到特定位置吗?

例如，如果一个文本框(例如输入元素，而不是文本区域)有50个字符，我想在字符20之前放置插入符号，我该怎么做呢?

这是在区别于这个问题:jQuery设置光标位置在文本区域，这需要jQuery。

当前回答

HTMLInputElement。临时人选;

// References
var e = document.getElementById( "helloworldinput" );

// Move caret to beginning on focus
e.addEventListener( "focus", function( event )
{
    // References
    var e = event.target;

    // Action
    e.setSelectionRange( 0, 0 );            // Doesn’t work for focus event
    
    window.setTimeout( function()
    {
        e.setSelectionRange( 0, 0 );        // Works
        //e.setSelectionRange( 1, 1 );      // Move caret to second position
        //e.setSelectionRange( 1, 2 );      // Select second character

    }, 0 );

}, false );

浏览器兼容性(仅适用于文本、搜索、url、电话和密码类型): https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/setSelectionRange#Specifications

2020-12-20 16:22:33

其他回答

我稍微调整了kd7的答案，因为elem。当selectionStart恰好为0时，selectionStart将计算为false。

function setCaretPosition(elem, caretPos) {
    var range;

    if (elem.createTextRange) {
        range = elem.createTextRange();
        range.move('character', caretPos);
        range.select();
    } else {
        elem.focus();
        if (elem.selectionStart !== undefined) {
            elem.setSelectionRange(caretPos, caretPos);
        }
    }
}

2012-04-19 11:54:15

function SetCaretEnd(tID) {
    tID += "";
    if (!tID.startsWith("#")) { tID = "#" + tID; }
    $(tID).focus();
    var t = $(tID).val();
    if (t.length == 0) { return; }
    $(tID).val("");
    $(tID).val(t);
    $(tID).scrollTop($(tID)[0].scrollHeight); }

2011-03-23 16:44:21

HTMLInputElement。临时人选;

// References
var e = document.getElementById( "helloworldinput" );

// Move caret to beginning on focus
e.addEventListener( "focus", function( event )
{
    // References
    var e = event.target;

    // Action
    e.setSelectionRange( 0, 0 );            // Doesn’t work for focus event
    
    window.setTimeout( function()
    {
        e.setSelectionRange( 0, 0 );        // Works
        //e.setSelectionRange( 1, 1 );      // Move caret to second position
        //e.setSelectionRange( 1, 2 );      // Select second character

    }, 0 );

}, false );

浏览器兼容性(仅适用于文本、搜索、url、电话和密码类型): https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/setSelectionRange#Specifications

2020-12-20 16:22:33

答案中的链接坏了，这个应该可以工作(所有的学分都转到blog.vishalon.net):

http://snipplr.com/view/5144/getset-cursor-in-html-textarea/

为了防止代码再次丢失，这里有两个主要函数:

function doGetCaretPosition(ctrl)
{
 var CaretPos = 0;

 if (ctrl.selectionStart || ctrl.selectionStart == 0)
 {// Standard.
  CaretPos = ctrl.selectionStart;
 }
 else if (document.selection)
 {// Legacy IE
  ctrl.focus ();
  var Sel = document.selection.createRange ();
  Sel.moveStart ('character', -ctrl.value.length);
  CaretPos = Sel.text.length;
 }

 return (CaretPos);
}


function setCaretPosition(ctrl,pos)
{
 if (ctrl.setSelectionRange)
 {
  ctrl.focus();
  ctrl.setSelectionRange(pos,pos);
 }
 else if (ctrl.createTextRange)
 {
  var range = ctrl.createTextRange();
  range.collapse(true);
  range.moveEnd('character', pos);
  range.moveStart('character', pos);
  range.select();
 }
}

2010-11-29 10:11:14

<!DOCTYPE html>
<html>
<head>
<title>set caret position</title>
<script type="application/javascript">
//<![CDATA[
window.onload = function ()
{
 setCaret(document.getElementById('input1'), 13, 13)
}

function setCaret(el, st, end)
{
 if (el.setSelectionRange)
 {
  el.focus();
  el.setSelectionRange(st, end);
 }
 else
 {
  if (el.createTextRange)
  {
   range = el.createTextRange();
   range.collapse(true);
   range.moveEnd('character', end);
   range.moveStart('character', st);
   range.select();
  }
 }
}
//]]>
</script>
</head>
<body>

<textarea id="input1" name="input1" rows="10" cols="30">Happy kittens dancing</textarea>

<p>&nbsp;</p>

</body>
</html>

2011-08-14 14:04:48

在html文本框中设置键盘插入符号的位置

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