我正在尝试使用html和javascript编写文本编辑器。我找到了以下小提琴，我们可以在一个文本区域中键入文本，单击预览按钮可以在其下方的区域中看到预览。
我想摆脱预览区域，并在文本输入的同一文本区域中将文本加粗。如何实现这一目标。
以下是代码：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style>
#my_textarea{
width:300px;
height:150px;
border:thin solid #000;
color:#000;
padding:10px;
min-height:150px;
min-width:300px;
max-height:150px;
max-width:300px;
}
#preview{
width:300px;
height:150px;
border:thin solid #000;
color:#000;
padding:10px;
min-height:150px;
min-width:300px;
max-height:150px;
max-width:300px;
}
</style>
<script type="text/javascript">
function formatText(tag) {
var myTextArea = document.getElementById('my_textarea');
var myTextAreaValue = myTextArea.value;
var selected_txt = myTextAreaValue.substring(myTextArea.selectionStart, myTextArea.selectionEnd);
var before_txt = myTextAreaValue.substring(0, myTextArea.selectionStart);
var after_txt = myTextAreaValue.substring(myTextArea.selectionEnd, myTextAreaValue.length);
myTextArea.value = before_txt + '<' + tag + '>' + selected_txt + '</' + tag + '>' + after_txt;
}
function preview() {
var textbox , view ;
textbox = document.getElementById('my_textarea');
view = document.getElementById("preview");
view.innerHTML = textbox.value
}
function onload(){
var textarea = document.getElementById("my_textarea");
textarea.onkeypress = function(e){
if( e.which === 13)
{
this.value += "<br>";
}
}
}
</script>
</head>
<body onLoad="onload();">
<input type="button" value="bold" onClick="formatText ('b');" />
<input type="button" value="italic" onClick="formatText ('i');" />
<input type="button" value="underline" onClick="formatText ('u');" /><br><br>
<textarea name="my_textarea" id="my_textarea"></textarea><br><br>
<div id="preview"></div><br>
<button id="btn" onClick="preview();">Preview</button>
</body>
</html>
答案 0 :(得分：1)
查看contenteditable HTML属性：
<div contenteditable="true">
This text can <b>be edited</b> by the user.
</div>
答案 1 :(得分：0)
保持js /视图
如果您的读者精通HTML，则可能需要使用JavaScript保留文本区域以更新查看器。可编辑的<div>似乎是一个不错的功能，但是它允许用户从Word文档中复制/粘贴，并且伴随着令人难以置信的 MS标记加载，其中很多是空的。谁想在数据库中以原始形式查看此类文本？！？！
下面是提供
的编辑器虽然没有遵循原始请求成为没有javascript的可编辑区域，但它会节省您的数据库（如果需要查看原始文本，则可以节省您的数据库）
<script type="text/javascript" src="pathTo/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
updCont();//in case existing text
var ht = window.innerHeight - $("#dvInput").css("height").replace(/[^.0-9]/g, '') - 30;
if(ht<200) ht = 200;//display height minimum (may extend a bit below page)
$("#dvCont").css("height", ht + "px");
$("#txtCont").keydown(function(e){
var curKey = e.which ? e.which : e.key;
if(e.ctrlKey && e.shiftKey){
if([56,190,80,65,83,76,85,79].indexOf(curKey)>-1)
e.preventDefault ? e.preventDefault() : (e.returnValue = false);
if(curKey == 56) fmt("bull");// *
else if(curKey == 190) fmt("indnt");// >
else if(curKey == 80) fmt("para");// P
else if(curKey == 65) fmt("href");// A
else if(curKey == 83) fmt("spn");// S
else if(curKey == 76) fmt("li");// L
else if(curKey == 85) fmt("ul");// U
else if(curKey == 79) fmt("ol");// O
}else if(e.ctrlKey){
if([66,73,13,85].indexOf(curKey)>-1)
e.preventDefault ? e.preventDefault() : (e.returnValue = false);
if(curKey == 66) fmt("bld");// B
else if(curKey == 73) fmt("ital");// I
else if(curKey == 85) fmt("uLine");// U
else if(curKey == 13) fmt("crlf");// [enter]
}
updCont();
});
// $("#inp").keydown(function(e){alert(e.which)})
});
function updCont(){
$("#dvCont").html($("#txtCont").val());//stuff the display div with textarea html text
}
function fmt(inAct){
//common needs
var oTxt = $("#txtCont");
var s = oTxt[0].selectionStart;
var e = oTxt[0].selectionEnd;
var raVal = [oTxt.val().substring(0, s), oTxt.val().substring(s, e), oTxt.val().substring(e), s, e];
var ofstStart = 0;
var ofstEnd = 0;
if(inAct=="bld"){
oTxt.val(raVal[0] + "<b>" + raVal[1] + "</b>" + raVal[2]);
//if you don't want text selected, add raVal[1].length to ofstStart
ofstStart = 3;
//uncomment to place cursor after closing tag (also unselect - set ofstStart to same point)
//ofstEnd = 4;
}else if(inAct=="ital"){
oTxt.val(raVal[0] + "<i>" + raVal[1] + "</i>" + raVal[2]);
ofstStart = 3;
//ofstEnd = 4;
}else if(inAct=="uLine"){
oTxt.val(raVal[0] + "<u>" + raVal[1] + "</u>" + raVal[2]);
ofstStart = 3;
//ofstEnd = 4;
}else if(inAct=="ul"){
oTxt.val(raVal[0] + "<ul>" + raVal[1] + "</ul>" + raVal[2]);
ofstStart = 4;
//ofstEnd = 5;
}else if(inAct=="ol"){
oTxt.val(raVal[0] + "<ol>" + raVal[1] + "</ol>" + raVal[2]);
ofstStart = 4;
//ofstEnd = 5;
}else if(inAct=="li"){
oTxt.val(raVal[0] + "<li style=''>" + raVal[1] + "</li>" + raVal[2]);
ofstStart = 13;
//ofstEnd = 5;
}else if(inAct=="indnt"){
oTxt.val(raVal[0] + "<div class='dnt'>" + raVal[1] + "</div>" + raVal[2]);
ofstStart = 17;
//ofstEnd = 5;
}else if(inAct=="bull"){
oTxt.val(raVal[0] + "<br /> • " + raVal[1] + raVal[2]);
ofstStart = 20;
}else if(inAct=="para"){
oTxt.val(raVal[0] + "<p>" + raVal[1] + "</p>" + raVal[2]);
ofstStart = 3;
//ofstEnd = 4;
}else if(inAct=="href"){
oTxt.val(raVal[0] + "<a href='' class='' title=''>" + raVal[1] + "</a>" + raVal[2]);
ofstStart = 29;
//ofstEnd = 4;
}else if(inAct=="spn"){
oTxt.val(raVal[0] + "<span class='' style=''>" + raVal[1] + "</span>" + raVal[2]);
ofstStart = 24;
//ofstEnd = 4;
}else if(inAct=="crlf"){
oTxt.val(raVal[0] + "<br />" + raVal[1] + raVal[2]);
ofstEnd = 5;
}
updCont();
//put cursor at end of selected range (ignores start if no selected text)
oTxt[0].selectionStart = s + ofstStart;
oTxt[0].selectionEnd = s + ofstStart + raVal[1].length;
oTxt[0].focus();
}
</script>
<style>
.dnt{margin-left:40px;}
.styleBtn{width:20px;margin:2px 10px;border:1px solid black;background-color:#EEE;float:left;text-align:center;}
</style>
</head><body>
<div id="dvInput">
<div style="border:1px solid black;border-radius:5px;background-color:silver;font-weight:bold;padding:2px 5px;float:left;">
<div style="float:left;margin:2px 20px;">Text Input:</div>
<span onclick="fmt('bld');" title="CTRL+B: Bold selected text">
<div class="styleBtn"><b>B</b></div>
</span>
<span onclick="fmt('ital');" title="CTRL+I: Italicize selected text">
<div class="styleBtn"><i>I</i></div>
</span>
<span onclick="fmt('uLine');" title="CTRL+U: Underline selected text">
<div class="styleBtn"><u>U</u></div>
</span>
<span onclick="fmt('ul');" title="CTRL+Shift+U: List Group <ul> (unordered) around highlighted/selected text">
<div class="styleBtn" style="height:19px;font-size:5.5pt;">
•__<br>
•__
</div>
</span>
<span onclick="fmt('ol');" title="CTRL+Shift+O: Ord List Group <ol> (ordered) around highlighted/selected text">
<div class="styleBtn" style="height:19px;font-size:5.5pt;padding-top:2px;">
1__<br>
2__
</div>
</span>
<span onclick="fmt('li');" title="CTRL+Shift+L: List Item <li> around highlighted/selected text">
<div class="styleBtn" style="width:30px;"><•></div>
</span>
<span onclick="fmt('indnt');" title="CTRL+Shift+>: <div> Indent a selected block of text\n(No remove shortcut.\nManually delete <div></div> to undo/outdent)">
<div class="styleBtn">></div>
</span>
<span onclick="fmt('bull');" title="CTRL+Shift+*: Bullet (and new line)">
<div class="styleBtn">•</div>
</span>
<span onclick="fmt('para');" title="CTRL+Shift+P: Paragraph <p> around highlighted/selected text">
<div class="styleBtn">¶</div>
</span>
<span onclick="fmt('crlf');" title="CTRL+Enter: New Line <br>">
<div class="styleBtn">↲</div>
</span>
<span onclick="fmt('href');" title="CTRL+Shift+A: <a href>">
<div class="styleBtn" style="width:33px;"><a></div>
</span>
<span onclick="fmt('spn');" title="CTRL+Shift+S: <span>">
<div class="styleBtn" style="width:48px;"><spn></div>
</span>
<!-- <input id="inp" size="2">-enter char, get ascii number -->
</div>
<textarea id="txtCont" rows="10" style="width:100%;" name="myText"
>lorem ipsum dolor magnificum est labat et nobis pacem</textarea><br />
</div>
Display:
<div id="dvCont" style="border:1px solid black;border-radius:5px;overflow-y:auto;"></div>