Question

我已经在下面组装了一个基本的jfiddle。由于某种原因，我的选择器用于检索textarea框以设置值，但选择器不能使用setSelectionRange函数。在控制台上你会发现.setSelectionRange不是函数的错误。

代码（请参考jfiddle）： selector.setSelectionRange(carat,carat);

Answer 1

setSelectionRange(carat,carat)不是jquery对象的方法。您想在DOM元素上使用它。所以试试：

selector[0].setSelectionRange(carat,carat); //use `[0]` or .get(0) on the jquery object

请参阅Reference

Fiddle

Answer 2

HTML：

<input type="search" value="Potato Pancakes" id="search">

JQUERY：

jQuery.fn.putCursorAtEnd = function() {

  return this.each(function() {

    $(this).focus()

    // If this function exists...
    if (this.setSelectionRange) {
      // ... then use it (Doesn't work in IE)

      // Double the length because Opera is inconsistent about whether a carriage return is one character or two. Sigh.
      var len = $(this).val().length * 2;

      this.setSelectionRange(len, len);

    } else {
    // ... otherwise replace the contents with itself
    // (Doesn't work in Google Chrome)

      $(this).val($(this).val());

    }

    // Scroll to the bottom, in case we're in a tall textarea
    // (Necessary for Firefox and Google Chrome)
    this.scrollTop = 999999;

  });

};

$("#search").putCursorAtEnd();

检查：

http://css-tricks.com/snippets/jquery/move-cursor-to-end-of-textarea-or-input/

Answer 3

你可以试试这对我有用。我用它来从单独的地址字段构建一个地址，然后复制粘贴。

HTML

<div id="d_clip_container" style="position:relative">
    (<a href="#" id="d_clip_button">copy to clipboard</a>)
</div>;
<textarea id="clip" rows="0" cols="0" style="border:none;height:0;width:0;"></textarea>

jQuery

    $(document).ready(function() {

        $('#d_clip_button').click(function() {
            //get all the values of needed elements
            var fName = $("#firstName").val();
            var lName = $("#lastName").val();
            var address = $("#Address").val();
            var city = $("#City").val();
            var state = $("#State").val();
            var zip = $("#Zip").val();
            //concatenate and set "clip" field with needed content
            $('#clip').val(fName + " " + lName + "\n" + address + "\n" + city + ", " + state + " " + zip);

            //Do it
            if(copyToClipboard('#clip')) {
                alert('text copied');
            } else {
                alert('copy failed');
            }
        });
    });

    function copyToClipboard(elem) {
        // set focus to hidden element and select the content
        $(elem).focus();
        // select all the text therein  
        $(elem).select();

        var succeed;
        try {
            succeed = document.execCommand("copy");
        } catch(e) {
            succeed = false;
        }

        // clear temporary content
        $(target).val('');

        return succeed;
    }

Answer 4

对我来说这是一个很好的解决方案

selector[0].setSelectionRange(start ,end);

但我想补充一点。我注意到setSelectionRange是元素获得焦点后异步可用的东西。

var element = selector[0];
element.addEventListener('focus', function() {
   element.setSelectionRange(start, end); 
});
element.focus();

您也可以使用：

element.selectionStart = start;
element.selectionEnd = end;

使用jQuery选择器和setSelectionRange不是一个函数

4 个答案:

Fiddle