Js仿微博插入话题功能

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引入JS
- 3.0.0 2.2.0 2.1.4 2.1.3 2.1.2 2.1.1 2.1.0 2.0.3 2.0.2 2.0.1 2.0.0 1.12.0 1.11.3 1.11.2 1.11.1 1.11.0 1.10.2 1.10.1 1.10.0 1.9.1 1.9.0 1.8.3 1.8.2 1.8.1 1.8.0 1.7.2 1.7.1 1.7 1.6.4 1.6.2 1.6.1 1.4.4 1.4.3 1.4.2 1.4.1 1.4.0
- 1.7.3 1.7.2 1.7.1.0 1.7.0.0
- 2.0.0-beta.0 2.0.0-alpha.55 1.5.0-rc.0 1.4.8 1.4.0 1.3.20 1.2.29 1.1.5 1.0.8
- 1.8.3 1.7.0 1.6.0 1.5.2 1.4.4 1.3.3 1.2.4 1.1.7
- 1.10.4 1.9.7 1.8.10 1.7.8 1.6.3 1.5.4 1.4.6 1.3.3
- core1.6.0 core-compat1.6.0 core1.5.2 core-compat1.5.2 core-full-compat-yc1.4.5 core-full-compat1.4.5 core-full-nocompat-yc1.4.5 core-full-nocompat1.4.5
- 1.4.2 1.4.1 1.4.0 1.3.0 1.2.0 1.1.0
- 3.7.3 3.7.2 3.7.1 3.7.0 3.7 3.6.2 3.6.1 3.6

引入框架
- 1.4.5 1.4.4 1.4.3 1.4.2 1.4.1 1.4.0 1.3.2
- 1.11.4 1.11.3 1.11.2 1.11.1 1.11.0 1.10.4 1.10.3 1.10.2
- 3.3.6 3.3.5 3.3.0 3.2.0 2.3.2

汉王

HTML代码

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Js仿微博插入话题功能</title>
<script>
//插入话题
function inTopic(id, str){
	var str = str || "请在这里输入自定义话题";
	str = "#" + str + "#";
	var reg = new RegExp(str),
	oTextarea = document.getElementById(id),
	oValue = oTextarea.value,
	val_index = 0,
	val_match,
    val_pos;
	if(reg.test(oValue)){
		val_match = oValue.match(reg);
        val_index = val_match.index;
	}
	else{
		val_pos = getTextPos(oTextarea);
        val_index = val_pos.start;
        rangeText(oTextarea, str);
	}
	selectText(oTextarea, val_index + 1, val_index + str.length - 1);
}
//光标的当前位置
function getTextPos(obj){
	if(!obj || obj.offsetWidth == 0){ return false; }
	var t = obj, start = 0, end = 0, value = '', range, range_all;
	value = t.value;
	if(typeof(t.selectionStart) == "number"){
		start = t.selectionStart;
		end = t.selectionEnd;
	} 
	else if(document.selection && t.offsetWidth>0){
		t.focus();
		range = document.selection.createRange();
		if(range.parentElement() == t){
			range_all = document.body.createTextRange();
			range_all.moveToElementText(t);
			for(start = 0; range_all.compareEndPoints("StartToStart", range) < 0; start++){
				range_all.moveStart('character', 1);
			}
			for(var i = 0; i <= start; i++){
				if(t.value.charAt(i) == '\n'){
					start++;
				}
			}
			range_all.moveToElementText(t);
			for(end = 0; range_all.compareEndPoints('StartToEnd', range) < 0; end++){
				range_all.moveStart('character', 1);
			}
			for(var i = 0; i <= end; i++){
				if(t.value.charAt(i) == '\n'){
					end++;
				}
			}
		}
	} 
	else{
		start = value.length;
		end = value.length;
	}
	return{
		start: start,
		end: end
	}
}
//光标处替换的文本
function rangeText(obj, val, num){
	if(!obj || obj.offsetWidth == 0){ return false; }
	var t = obj, start = 0, end = 0, value = '', val_start = '', val_end = '', pos;
	var userAgent = navigator.userAgent.toLowerCase(), ie = /msie/.test(userAgent) && !/opera/.test(userAgent);
	if(ie && t.nodeName.toLocaleLowerCase() != 'textarea'){
		t.value = val;
		t.focus;
		return;
	}
	value = t.value;
	pos = getTextPos(t);
	start = pos.start;
	end = pos.end;
	if (typeof num=='number'){
		start = start - num;
	}
	val_start = value.substring(0, start);
	val_end = value.substring(end);
	t.value = val_start + val + val_end;
	if (typeof num=='number'){
		end = end - num;
	}
	selectText(t,end+val.length,end+val.length);
}
//光标定位到指定文本
function selectText(obj, start, stop){
	if(!obj || obj.offsetWidth == 0){ return false; }
	var range;
	if(obj.setSelectionRange){
		obj.setSelectionRange(start,stop);
	}
	else{
		range = obj.createTextRange();
		range.collapse(true);
		range.moveStart("character",start);
		range.moveEnd("character",stop-start);
		range.select();
	}
	obj.focus();
}
</script>
<style type="text/css">
body{margin:0;}
.box{width:600px;height:200px;background:url(//ku.shouce.ren/files/images/201601/56a3212993695.png) no-repeat;margin:60px auto;position:relative;}
#textarea{ border: medium none;font-size: 14px;height: 70px;line-height: 124%;padding: 0;width: 475px;overflow:hidden;resize: none;position:absolute;left:62px; top:55px;outline: none;}
.button{width:100px;height:30px;background:url(//ku.shouce.ren/files/images/201601/56a3212a3d52e.gif) 0 0 no-repeat;position:absolute;left:442px;top:135px;}
.button:hover{background-position:0 -30px;}
.button:active{background-position:0 -60px;}
.topic{position:absolute;left:72px;top:136px;height:26px;line-height:26px;text-decoration:none;color:#fff;font-size:12px;background:url(//ku.shouce.ren/files/images/201601/56a3212ae3c80.gif) no-repeat 0 7px;padding-left:14px;}
</style>
</head>
<body>
<div class="box">
	<textarea id="textarea" accesskey="1" tabindex="1" style="font-family: Tahoma,宋体;"></textarea>
	<a href="" class="button"></a>
	<a href="###" class="topic" onclick="inTopic('textarea','手册网')">话题</a>
</div>
</body>
</html>

AخA
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Js仿微博插入话题功能</title>
<script>
//插入话题
function inTopic(id, str){
    var str = str || "请在这里输入自定义话题";
    str = "#" + str + "#";
    var reg = new RegExp(str),
    oTextarea = document.getElementById(id),
    oValue = oTextarea.value,
    val_index = 0,
    val_match,
    val_pos;

CSS代码

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CSS代码...​x
 
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JS代码

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JS代码...xxxxxxxxxx
 
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名称

Js仿微博插入话题功能

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描述

Js微博插入话题功能，仿新浪微博插入新话题效果，当点击或选择话题后，自动将话题文字插入到微博文本框中，用户不用再输入了，提升用户体验。两点说明： <br>　　1.获取光标位置IE下用到了createRange的方法，标准下用到selectionStart <...