在光标使用Javascript / jquery的位置插入文本

问题描述：

我有一个包含很多文本框的页面。当有人点击链接时，我希望在光标所在的位置插入一两个字，或者将其附加到具有焦点的文本框中。

I have a page with a lot of textboxes. When someone clicks a link, i want a word or two to be inserted where the cursor is, or appended to the textbox which has the focus.

例如，如果光标/焦点在一个文本框上，说苹果，然后他点击一个链接说'[email]'，然后我想让文本框说'apple bob@example.com'。

For example, if the cursor/focus is on a textbox saying 'apple' and he clicks a link saying '[email]', then i want the textbox to say, 'apple bob@example.com'.

我该怎么做？这是否可能，因为如果重点是收音机/下拉/非文本框元素怎么办？可以记住最后关注文本框吗？

How can I do this? Is this even possible, since what if the focus is on a radio/dropdown/non textbox element? Can the last focused on textbox be remembered?

答

使用此项，来自这里：

function insertAtCaret(areaId, text) {
  var txtarea = document.getElementById(areaId);
  if (!txtarea) {
    return;
  }

  var scrollPos = txtarea.scrollTop;
  var strPos = 0;
  var br = ((txtarea.selectionStart || txtarea.selectionStart == '0') ?
    "ff" : (document.selection ? "ie" : false));
  if (br == "ie") {
    txtarea.focus();
    var range = document.selection.createRange();
    range.moveStart('character', -txtarea.value.length);
    strPos = range.text.length;
  } else if (br == "ff") {
    strPos = txtarea.selectionStart;
  }

  var front = (txtarea.value).substring(0, strPos);
  var back = (txtarea.value).substring(strPos, txtarea.value.length);
  txtarea.value = front + text + back;
  strPos = strPos + text.length;
  if (br == "ie") {
    txtarea.focus();
    var ieRange = document.selection.createRange();
    ieRange.moveStart('character', -txtarea.value.length);
    ieRange.moveStart('character', strPos);
    ieRange.moveEnd('character', 0);
    ieRange.select();
  } else if (br == "ff") {
    txtarea.selectionStart = strPos;
    txtarea.selectionEnd = strPos;
    txtarea.focus();
  }

  txtarea.scrollTop = scrollPos;
}

<textarea id="textareaid"></textarea>
<a href="#" onclick="insertAtCaret('textareaid', 'text to insert');return false;">Click Here to Insert</a>

在光标使用Javascript / jquery的位置插入文本

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