Question

我想将所选文本存储在变量中，然后按一个按钮删除所选文本。最好用jquery但我不介意基本的javascript。

提前致谢。

更新：

感谢George，我已经尝试了一个例子，你指出将代码剥离到我需要的东西但是我无法让它在按下按钮时工作。它只有在我将#addchapter更改为textarea时才有效。我的代码有什么问题吗？感谢。

<html>
<head>

    <script type="text/javascript" src="jquery-latest.pack.js"></script>
    <script type="text/javascript" src="jquery-fieldselection.js"></script>
    <script type="text/javascript"><!--//--><![CDATA[//><!--

        $(document).ready(function(){

            $('#addchapter').click(update);         
        });

        function update(e) {

            var range = $(this).getSelection();

            $('#output').html(
                "selected text:\n<span class=\"txt\">" + ((true) ? range.text.whitespace() : range.text) + "</span>\n\n"
            );
        }


        String.prototype.whitespace = (function() {

            if (!RegExp.escape) { 
              RegExp.escape = (function() {
                var specials = [ '/', '.', '*', '+', '?', '|', '(', ')', '[', ']', '{', '}', '\\' ];
                var sRE = new RegExp( '(\\' + specials.join('|\\') + ')', 'g' );
                return function(text) { return text.replace(sRE, '\\$1') }
              })();

            }

            var ws = { "\r\n": "¶", "\n": "¶", "\r": "¶", "\t": "&raquo;", " ": "&middot;" };

            return ($.browser.msie) ? function() {

                var s = this;
                $.each(ws, function(i){ s = s.replace(new RegExp(RegExp.escape(i), 'g'), this) });
                return s;
            } : function () {
                var s = this;
                $.each(ws, function(i){ s = s.replace(new RegExp(RegExp.escape(i), 'g'), this + "\u200b") });
                return s;
            }

        })();


        //--><!]]>

    </script>

</head>
<body>

            <pre id="output"></pre>

            <textarea id="area1" name="area1">textarea: foo bar baz</textarea>

            <input type="button" value="add" id="addchapter">

</body>
</html>

更新2：

结束使用此功能 - http://plugins.jquery.com/project/a-tools

Answer 1

我相信这个问题有你想要的：How to get selected text in textarea?

编辑：

这也可能有用（在该问题中有关）：

Understanding what goes on with textarea selection with JavaScript

Answer 2

这个问题看起来很清楚但是代码却令人混淆不清，所以我会在没有代码的情况下回答这个问题。

deleteSelectedText()功能会从您提供的<textarea>或<input type="text">中删除所选文字，并返回已删除的文字。

function getSelectionBoundary(el, start) {
    var property = start ? "selectionStart" : "selectionEnd";
    var originalValue, textInputRange, precedingRange, pos, bookmark, isAtEnd;

    if (typeof el[property] == "number") {
        return el[property];
    } else if (document.selection && document.selection.createRange) {
        el.focus();

        var range = document.selection.createRange();
        if (range) {
            // Collapse the selected range if the selection is not a caret
            if (document.selection.type == "Text") {
                range.collapse(!!start);
            }

            originalValue = el.value;
            textInputRange = el.createTextRange();
            precedingRange = el.createTextRange();
            pos = 0;

            bookmark = range.getBookmark();
            textInputRange.moveToBookmark(bookmark);

            if (/[\r\n]/.test(originalValue)) {
                // Trickier case where input value contains line breaks

                // Test whether the selection range is at the end of the
                // text input by moving it on by one character and
                // checking if it's still within the text input.
                try {
                    range.move("character", 1);
                    isAtEnd = (range.parentElement() != el);
                } catch (ex) {
                    log.warn("Error moving range", ex);
                    isAtEnd = true;
                }
                range.moveToBookmark(bookmark);

                if (isAtEnd) {
                    pos = originalValue.length;
                } else {
                    // Insert a character in the text input range and use
                    // that as a marker
                    textInputRange.text = " ";
                    precedingRange.setEndPoint("EndToStart", textInputRange);
                    pos = precedingRange.text.length - 1;

                    // Delete the inserted character
                    textInputRange.moveStart("character", -1);
                    textInputRange.text = "";
                }
            } else {
                // Easier case where input value contains no line breaks
                precedingRange.setEndPoint("EndToStart", textInputRange);
                pos = precedingRange.text.length;
            }
            return pos;
        }
    }
    return 0;
}

function deleteSelectedText(el) {
    var start = getSelectionBoundary(el, true);
    var end = getSelectionBoundary(el, false);
    var val = el.value;
    var selectedText = val.slice(start, end);
    el.value = val.slice(0, start) + val.slice(end);
    return selectedText;
}

在textarea中获取所选文本

2 个答案: