输入框优化

1.自动选中输入框的文字

	<input onfocus="this.select()">

2.鼠标悬停在输入框时改变边框颜色或背景色
（1）css中加入input：hover{border:1px solid #f00}
（2）<input onfocus="this.select()" onmouseover="this.style.bordercolor="#f00" onmouseout="his.style.bordercolor=""">
3.点击输入框默认文字消失
（1）<input type="text" value="请输入用户名" onfocus="if(value =="请输入用户名"){value""}" onblur="if(value==""){value="请输入用户名"}">

	<input id="searchKey" type="text" name="q" value="" tips="请输入关键字"/><br />
	
	<script language="javascript" type="text/javascript">
	
	window.onload = function(){
	
	var o=document.getElementByIdx_x("searchKey"); 
	
	o.setAttribute("valueCache",o.value);
	
	o.onblur = function(){ if(o.value=="")
	
	{ o.valueCache=""; o.value=o.tips; 
	
	}
	
	else
	
	o.valueCache=o.value;
	
	} 
	
	o.onfocus = function(){ 
	
	o.value=o.valueCache; //光标始终在文字最后
	
	var e = event.srcElement;
	
	var r =e.createTextRange(); 
	
	r.moveStart('character',e.value.length);
	
	r.collapse(true);
	
	r.select();
	
	}
	
	o.onblur(); 
	
	} 
	
	<script>

4.输入字时输入框边框闪烁（边框为小方型）

<Script Language="JavaScript">
function borderColor(){
if(self['oText'].style.borderColor=='red'){
self['oText'].style.borderColor = 'yellow';
}else{
self['oText'].style.borderColor = 'red';
}
oTime = setTimeout('borderColor()',400);
}
</Script>
<input type="text" id="oText" style="border:5px dotted red;color:red" οnfοcus="borderColor(this);" οnblur="clearTimeout(oTime);">

5.输入字时输入框边框闪烁（边框为虚线）

	<style>
	#oText{border:1px dotted #ff0000;ryo:expression(οnfοcus=function light (){with(document.all.oText){style.borderColor=(style.borderColor=="#ffee00"?"#ff0000":"#ffee00");timer=setTimeout(light,500);}},οnblur=function(){this.style.borderColor="#ff0000";clearTimeout(timer)})};
	</style>
	<input type="text" id="oText">

6.自动横向延伸的输入框

<input type="text" style="huerreson:expression(this.width=this.scrollWidth)" value="abcdefghijk">

7.自动向下延伸的文本框

<textarea name="content" rows="6" cols="80" onpropertychange="if(this.scrollHeight>80) this.style.posHeight=this.scrollHeight+5">输入几个回车试试</textarea>

8.只有下划线的文本框

<input style="border:0;border-bottom:1 solid black;background:;">

9.软件序列号式的输入框

<script for="T" event="onkeyup">
if(value.length==3)document.all[event.srcElement.sourceIndex+1].select();
</script>
<input name="T" size="5" maxlength="3">—<input name="T" size="5" maxlength="3">—<input name="T" size="5" maxlength="3">—<input name="T" size="5" maxlength="3">—<input name="T" size="5" maxlength="3">—<input name="T7" size="5" maxlength="3">

10.软件序列号式的输入框（完整版）

<script for="T" event="onkeyup">if(value.length==maxLength)document.all[event.srcElement.sourceIndex+1].focus();</script>

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