获取文本输入字段中的光标位置(以字符为单位) [英] Get cursor position (in characters) within a text Input field

问题描述

如何从输入字段中获取插入符号位置?

How can I get the caret position from within an input field?

我通过谷歌找到了一些零碎的东西，但没有防弹.

I have found a few bits and pieces via Google, but nothing bullet proof.

基本上像 jQuery 插件这样的东西是理想的，所以我可以简单地做

Basically something like a jQuery plugin would be ideal, so I could simply do

$("#myinput").caretPosition()

推荐答案

更容易更新:

在此答案中使用 field.selectionStart 示例.

感谢@commonSenseCode 指出这一点.

Thanks to @commonSenseCode for pointing this out.

旧答案:

找到了这个解决方案.不是基于 jquery，但集成到 jquery 中没有问题:

Found this solution. Not jquery based but there is no problem to integrate it to jquery:

/*
** Returns the caret (cursor) position of the specified text field (oField).
** Return value range is 0-oField.value.length.
*/
function doGetCaretPosition (oField) {

  // Initialize
  var iCaretPos = 0;

  // IE Support
  if (document.selection) {

    // Set focus on the element
    oField.focus();

    // To get cursor position, get empty selection range
    var oSel = document.selection.createRange();

    // Move selection start to 0 position
    oSel.moveStart('character', -oField.value.length);

    // The caret position is selection length
    iCaretPos = oSel.text.length;
  }

  // Firefox support
  else if (oField.selectionStart || oField.selectionStart == '0')
    iCaretPos = oField.selectionDirection=='backward' ? oField.selectionStart : oField.selectionEnd;

  // Return results
  return iCaretPos;
}

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