Textarea工具栏?

时间:2011-07-27 23:49:20

标签: javascript html

我一直在为textarea设计一个格式工具栏,就像在这个网站上写问题的工具栏一样(用粗体,斜体,下划线按钮)。唯一的区别是我需要按钮使文本实际上是粗体而不只是添加粗体标签。我需要的是类似于Instructables.com丰富的评论编辑器,或newgrounds.com评论编辑器,或谷歌文档。有没有人知道如何在textarea中显示一些粗体,斜体或下划线的文本,但保留其余部分?

3 个答案:

答案 0 :(得分:1)

有许多javascript WYSIWYG eitors的实现。 FCKEditor(现为CKEditor)是第一个。 TinyMCE很受欢迎。我最近使用过TinyEditor

还有nicedit,列出了10位编辑并比较了here,更不用说之前在此提供的关于what's available问题的答案了。

他们不必生成HTML - 还有编辑生成Wiki markup

为什么重新发明轮子?

答案 1 :(得分:1)

我找到了如何创建自己的富文本编辑器:

(function ($) {
    if (typeof $.fn.rte === "undefined") {
        var defaults = {
            content_css_url: "rte.css",
            media_url: "images",
            dot_net_button_class: null,
            max_height: 350
        };
        $.fn.rte = function (options) {
            $.fn.rte.html = function (iframe) {
                return iframe.contentWindow.document.getElementsByTagName("body")[0].innerHTML;
            };
            var opts = $.extend(defaults, options);
            return this.each(function () {
                var textarea = $(this);
                var iframe;
                var myID = textarea.attr("id");
                var settings = $.meta ? $.extend({}, opts, textarea.data()) : opts;
                var sel = {
                    cmdBtnSelector: "." + settings.dot_net_button_class
                };


                function enableDesignMode() {
                    var content = textarea.val();
                    if ($.trim(content) == '') {
                        content = '<br />';
                    }
                    if (iframe) {
                        textarea.hide();
                        $(iframe).contents().find("body").html(content);
                        $(iframe).show();
                        $("#toolbar-" + myID).remove();
                        textarea.before(toolbar());
                        return true;
                    }
                    iframe = document.createElement("iframe");
                    iframe.frameBorder = 0;
                    iframe.frameMargin = 0;
                    iframe.framePadding = 0;
                    iframe.height = 200;
                    if (textarea.attr('class')) iframe.className = textarea.attr('class');
                    if (textarea.attr('id')) iframe.id = myID;
                    if (textarea.attr('name')) iframe.title = textarea.attr('name');
                    textarea.after(iframe);
                    var css = "";
                    if (settings.content_css_url) {
                        css = "<link type='text/css' rel='stylesheet' href='" + settings.content_css_url + "' />";
                    }
                    var doc = "<html><head>" + css + "</head><body class='frameBody'>" + content + "</body></html>";
                    tryEnableDesignMode(doc, function () {
                        $("#toolbar-" + myID).remove();
                        textarea.before(toolbar());
                        textarea.hide();
                    });
                }
                function tryEnableDesignMode(doc, callback) {
                    if (!iframe) {
                        return false;
                    }
                    try {
                        iframe.contentWindow.document.open();
                        iframe.contentWindow.document.write(doc);
                        iframe.contentWindow.document.close();
                    } catch (error) {
                        console.log(error)
                    }
                    if (document.contentEditable) {
                        iframe.contentWindow.document.designMode = "On";
                        callback();
                        return true;
                    } else if (document.designMode != null) {
                        try {
                            iframe.contentWindow.document.designMode = "on";
                            callback();
                            return true;
                        } catch (error) {
                            console.log(error)
                        }
                    }
                    setTimeout(function () {
                        tryEnableDesignMode(doc, callback)
                    }, 250);
                    return false;
                }
                function disableDesignMode(submit) {
                    var content = $(iframe).contents().find("body").html();
                    if ($(iframe).is(":visible")) {
                        textarea.val(content);
                    }
                    if (submit !== true) {
                        textarea.show();
                        $(iframe).hide();
                    }
                }
                function toolbar() {
                    var tb = $("<div class='rte-toolbar' id='toolbar-" + myID + "'><div>\
              <p>\
                  <select>\
                      <option value=''>Block style</option>\
                      <option value='p'>Paragraph</option>\
                      <option value='h3'>Title</option>\
                  </select>\
              </p>\
              <p>\
                  <a href='#' class='bold'><img src='" + settings.media_url + "text_bold.png' alt='bold' title='Bold' /></a>\
                  <a href='#' class='italic'><img src='" + settings.media_url + "text_italic.png' alt='italic' title='Italicize' /></a>\
              </p>\
              <p>\
                  <a href='#' class='unorderedlist'><img src='" + settings.media_url + "text_list_bullets.png' alt='unordered list' title='Unordered List' /></a>\
                  <a href='#' class='link'><img src='" + settings.media_url + "link.png' alt='link' title='Hyperlink' /></a>\
                  <a href='#' class='image'><img src='" + settings.media_url + "image.png' alt='image' title='Image' /></a>\
                  <a href='#' class='disable'><img src='" + settings.media_url + "code.png' alt='close rte' title='View Code' /></a>\
              </p></div></div>");
                    $('select', tb).change(function () {
                        var index = this.selectedIndex;
                        if (index != 0) {
                            var selected = this.options[index].value;
                            formatText("formatblock", '<' + selected + '>');
                        }
                    });
                    $('.bold', tb).click(function () {
                        formatText('bold');
                        return false;
                    });
                    $('.italic', tb).click(function () {
                        formatText('italic');
                        return false;
                    });
                    $('.unorderedlist', tb).click(function () {
                        formatText('insertunorderedlist');
                        return false;
                    });
                    $('.link', tb).click(function () {
                        var p = prompt("URL:");
                        if (p) formatText('CreateLink', p);
                        return false;
                    });
                    $('.image', tb).click(function () {
                        var p = prompt("image URL:");
                        if (p) formatText('InsertImage', p);
                        return false;
                    });
                    $('.disable', tb).click(function () {
                        disableDesignMode();
                        var edm = $('<a href="#">Enable design mode</a>');
                        tb.empty().append(edm);
                        edm.click(function (e) {
                            e.preventDefault();
                            enableDesignMode();
                            $(this).remove();
                        });
                        return false;
                    });
                    if (settings.dot_net_button_class != null) {
                        var cmdBtn = $(iframe).parents('form').find(sel.cmdBtnSelector);
                        cmdBtn.click(function () {
                            disableDesignMode(true);
                        });
                    } else {
                        $(iframe).parents('form').submit(function () {
                            disableDesignMode(true);
                        });
                    }
                    var iframeDoc = $(iframe.contentWindow.document);
                    var select = $('select', tb)[0];
                    iframeDoc.mouseup(function () {
                        setSelectedType(getSelectionElement(), select);
                        return true;
                    });
                    iframeDoc.keyup(function () {
                        setSelectedType(getSelectionElement(), select);
                        var body = $('body', iframeDoc);
                        if (body.scrollTop() > 0) {
                            var iframe_height = parseInt(iframe.style['height']);
                            if (isNaN(iframe_height)) {
                                iframe_height = 0;
                            }
                            var h = Math.min(opts.max_height, iframe_height + body.scrollTop()) + 'px';
                            iframe.style['height'] = h;
                        }
                        return true;
                    });
                    return tb;
                }
                function formatText(command, option) {
                    iframe.contentWindow.focus();
                    try {
                        iframe.contentWindow.document.execCommand(command, false, option);
                    } catch (e) {
                        console.log(e)
                    }
                    iframe.contentWindow.focus();
                }
                function setSelectedType(node, select) {
                    while (node.parentNode) {
                        var nName = node.nodeName.toLowerCase();
                        for (var i = 0; i < select.options.length; i++) {
                            if (nName == select.options[i].value) {
                                select.selectedIndex = i;
                                return true;
                            }
                        }
                        node = node.parentNode;
                    }
                    select.selectedIndex = 0;
                    return true;
                }
                function getSelectionElement() {
                    if (iframe.contentWindow.document.selection) {
                        selection = iframe.contentWindow.document.selection;
                        range = selection.createRange();
                        try {
                            node = range.parentElement();
                        } catch (e) {
                            return false;
                        }
                    } else {
                        try {
                            selection = iframe.contentWindow.getSelection();
                            range = selection.getRangeAt(0);
                        } catch (e) {
                            return false;
                        }
                        node = range.commonAncestorContainer;
                    }
                    return node;
                }
                enableDesignMode();
            });
        };
    }
})(jQuery);

答案 2 :(得分:0)

使用contentEditable DOM属性使文档或其中的一部分可编辑。这不适用于<textarea>;更常见的是创建<iframe>并将其中的文档用作编辑器。

Mark Pilgrim在Web超文本应用技术工作组的博客上有an article explaining it。它包括an example page,其中显示了一些正在使用的功能。