如何使用已经有价值的asp文本框的占位符？ [英] How to use place holder for asp text box which already having value?

问题描述

我有一个asp文本框，它在pageload上有一个默认值，比如'a'。我需要显示文本框其余部分的占位符。我用过占位符属性。但是当它有文本时它没有显示占位符值。

解决方案

你可以使用属性集合，所以你会有类似的东西..

 Textbox1.Attributes.Add（ 占位符， 搜索 + a）; 

a =在页面加载时通过文本框传递您的值

搜索=您的默认占位符名称（其余部分）你在问题中描述的文本框的一部分）



或

 Textbox1.Attributes [ 占位符] =  如果您正在使用，请搜索 + a; 

//或属性（占位符） vb.net

试试这个..

< asp：textbox id = Txt_example runat = server 占位符 = 示例 > < / asp：textbox >

支持IE8和9：



参考：如何支持占位符a在IE8和9中分配

Hi,
I have an asp textbox which is having a default value on pageload like 'a'. I need to show the place holder for the rest portion of the textbox. I have used place holder property. But it doesn't show place holder value when there is a text in it.

解决方案

you could use the attributes collection, So you would have something like..

Textbox1.Attributes.Add("placeholder", "Search" + a);

a=Pass your value whatever you want to pass in textbox on page load
Search=your default placeholder's name(For the rest of portion of textbox as you describe in Question)

or

Textbox1.Attributes["placeholder"] = "Search" + a;

// or Attributes("placeholder") if you're using vb.net

Try this..

<asp:textbox id="Txt_example" runat="server" placeholder="Example" ></asp:textbox>

Support IE8 and 9 :

Ref : How to support placeholder attribute in IE8 and 9

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