在TextArea中捕获选项卡

本文介绍了在TextArea中捕获选项卡的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

有没有人知道一个跨浏览器，可靠的解决方案，用于在textarea字段中捕获tab键的按键，并替换（在正确的位置）4个空格？ textarea用于输入一篇文章，需要这个功能。

Does anyone know a cross-browser, reliable solution for catching presses of the tab-key in a textarea field, and replacing (in the correct position) 4 spaces? The textarea is being used to input an essay, and needs this feature.

注意：我尝试过使用FCKEditor，其中没有捕获标签，并且有一些我不需要的功能。我想要一个简单的解决方案，只是为了捕捉标签。

Note: I tried using FCKEditor, among others, which did not catch tabs and had a bunch of features I didn't need. I want a simple solution just for catching tabs.

推荐答案

我没有广泛测试，但这似乎有用：

I didn't test extensively, but this seems to work:

（我在）

<textarea id="text-area" rows="20" cols="100"></textarea>

<script>
document.getElementById("text-area").onkeydown = function(e) {
  if (!e && event.keyCode == 9)
  {
    event.returnValue = false;
    insertAtCursor(document.getElementById("text-area"), "    ");
  }
  else if (e.keyCode == 9)
  {
    e.preventDefault();
    insertAtCursor(document.getElementById("text-area"), "    ");
  }
};

//http://alexking.org/blog/2003/06/02/inserting-at-the-cursor-using-javascript#comment-3817
function insertAtCursor(myField, myValue) {
  //IE support
  if (document.selection) {
    var temp;
    myField.focus();
    sel = document.selection.createRange();
    temp = sel.text.length;
    sel.text = myValue;
    if (myValue.length == 0) {
      sel.moveStart('character', myValue.length);
      sel.moveEnd('character', myValue.length);
    } else {
      sel.moveStart('character', -myValue.length + temp);
    }
    sel.select();
  }
  //MOZILLA/NETSCAPE support
  else if (myField.selectionStart || myField.selectionStart == '0') {
    var startPos = myField.selectionStart;
    var endPos = myField.selectionEnd;
    myField.value = myField.value.substring(0, startPos) + myValue + myField.value.substring(endPos, myField.value.length);
    myField.selectionStart = startPos + myValue.length;
    myField.selectionEnd = startPos + myValue.length;
  } else {
    myField.value += myValue;
  }
}
</script>

编辑：修改了脚本，使其不使用jQuery。

EDIT: Modified the script so it doesn't use jQuery.

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