Textarea工具栏？ [英] Textarea toolbar?
本文介绍了Textarea工具栏？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
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，斜体或带下划线的文本，但保留其余部分？
I have been working on a formatting toolbar for a textarea, much like the toolbar for writing questions on this very site (with the bold, italic, underline buttons). The only difference is that I need the buttons to make the text actually bold not just add a bold tag. What I need is similar to the Instructables.com rich comment editor, or the newgrounds.com comment editor, or google docs. Does anyone have a clue how I can make some text in a textarea show up bold, italic, or underlined but keep the rest of it?
推荐答案
我发现如何创建自己的富文本编辑器：
I found how to create own Rich Text Editor just like this :
(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);
这篇关于Textarea工具栏？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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