关于可见=假和显示问题：无; [英] Question regarding Visible=false and display:none;
问题描述
如果我设置一些控件的属性Visible =false时，我不能看到我的aspx页面生成的HTML控件。但是当我使用显示：无风格标记该控件，我看到作为HTML灰色控制。这是为什么？
另外，如果我发现不需要在页面上了一定的控制： -
- 应该从我的页面注释掉？
- 我应该设置其属性Visible = FALSE
- 我应该设置显示：无
什么是牢记时间限制和页面的沉重感的最佳方法？
下面是那是我测试页生成的HTML： -
＆LT;！DOCTYPE HTML PUBLIC - // W3C // DTD XHTML 1.0过渡// ENhttp://www.w3.org/TR/xhtml1/DTD/ XHTML1-transitional.dtd＆GT;
＆LT; HTML的xmlns =http://www.w3.org/1999/xhtml＆GT;
＆LT; HEAD＆GT;
＆LT;标题＆GT; ＆LT; /标题＆GT;
＆LT; /头＆GT;
＆LT;身体GT;
＆LT;表ID =form1的行动=testvisibility.aspx方法=后NAME =form1的＆GT;
＆LT; DIV＆GT;
＆LT;输入ID =__ VIEWSTATE类型=隐藏 value=\"/wEPDwUKMTY2NDk3NDQzNQ9kFgICAw9kFgQCBw8PFgIeB1Zpc2libGVoZGQCCQ8WAh4Fc3R5bGUFDWRpc3BsYXk6bm9uZTtkZEjYzMWMovvrGmuSrQHwc5ZXgqXCrf+lekz1GgsdjUd+\" NAME =__ VIEWSTATE＆GT;
＆LT; / DIV＆GT;
＆LT; DIV＆GT;
visiblelabel ::
＆所述;跨度的id =visiblelabel＆GT; visiblelabel＆下; /跨度＆GT;
＆LT; BR＆GT;
labelwithvisiblefalseonaspx ::
＆LT; BR＆GT;
labelwithdisplaynoneonaspx ::
＆LT; DIV的风格=显示：无;＆GT;
＆所述;跨度的id =labelwithdisplaynoneonaspx＆GT; labelwithdisplaynoneonaspx＆下; /跨度＆GT;
＆LT; / DIV＆GT;
＆LT; BR＆GT;
labelwithvisiblefalseonserverside ::
＆LT; BR＆GT;
labelwithdisplaynoneonserverside ::
＆LT; DIV ID =divforlabelwithdisplaynoneonserverside的风格=显示：无;＆GT;
＆所述;跨度的id =labelwithdisplaynoneonserverside＆GT; labelwithdisplaynoneonserverside＆下; /跨度＆GT;
＆LT; / DIV＆GT;
＆LT; BR＆GT;
＆LT; / DIV＆GT;
＆LT; /表及GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;
如果要动态显示或通过Ajax的/ etc隐藏控制，或者控制包含的信息你的页面需要设置显示：无在CSS
如果你不希望呈现控件在所有的在某些情况下的设置可见=假。由于它保持控件的HTML页面输出的内容，它使略小页面 - 但如果你想显示通过Ajax的/ etc控制，这是不行的。
如果你不希望呈现控件可言，时期的，不要把它注释掉 - 完全删除。所有的控制，可见或不可见，仍然需要处理，所以可见=假在浪费CPU（和可能导致的副作用）如果你从来没有打算呈现控件。而你真的不希望大量的注释掉的东西飘来飘去;它只是让维修困难。您可以随时拿回来从你的版本控制，如果你发现你以后需要它。 （您的是的使用SVN / GIT中/ CVS /的的东西的吧？）
If I set some control's property Visible="false", I cant see the control in the HTML generated of my aspx page. But when I use display:none in style tag for that control, I see the control as greyed out in the HTML. Why is that?
Also, If I find some control that is not needed on the page anymore:-
- should I comment it out from my page?
- Should I set its property Visible=false"
- Should I set display:none?
What would be the best approach keeping in mind the time constraint and page's heaviness?
Below is the HTML that was generated of my test page:-
<!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> </title>
</head>
<body>
<form id="form1" action="testvisibility.aspx" method="post" name="form1">
<div>
<input id="__VIEWSTATE" type="hidden" value="/wEPDwUKMTY2NDk3NDQzNQ9kFgICAw9kFgQCBw8PFgIeB1Zpc2libGVoZGQCCQ8WAh4Fc3R5bGUFDWRpc3BsYXk6bm9uZTtkZEjYzMWMovvrGmuSrQHwc5ZXgqXCrf+lekz1GgsdjUd+" name="__VIEWSTATE">
</div>
<div>
visiblelabel::
<span id="visiblelabel">visiblelabel</span>
<br>
labelwithvisiblefalseonaspx::
<br>
labelwithdisplaynoneonaspx::
<div style="display: none;">
<span id="labelwithdisplaynoneonaspx">labelwithdisplaynoneonaspx</span>
</div>
<br>
labelwithvisiblefalseonserverside::
<br>
labelwithdisplaynoneonserverside::
<div id="divforlabelwithdisplaynoneonserverside" style="display: none;">
<span id="labelwithdisplaynoneonserverside">labelwithdisplaynoneonserverside</span>
</div>
<br>
</div>
</form>
</body>
</html>
If you want to dynamically show or hide the control via Ajax/etc, or if the control contains information your page needs, set display:none in CSS.
If you don't want to render the control at all in certain situations, set Visible="false". Since it keeps the control's HTML out of the page, it makes for slightly smaller pages -- but if you want to show the control via Ajax/etc, this won't work.
If you don't want to render the control at all, period, don't comment it out -- remove it altogether. All controls, visible or not, still require processing, so Visible=false is wasting CPU (and possibly causing side effects) if you never intend to render the control. And you really don't want lots of commented-out stuff floating around; it just makes maintenance harder. You can always get it back from your revision control if you find you do need it later. (You are using SVN/Git/CVS/something, right?)
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