How to access span id in code behind

问题

I have an asp website with the following control:

    <span id="expTrainingShow" class="clsLink" style="margin-left: 20px;" onclick="GridChanger();">
        + Show Expired Continuing Education</span>

I want to hide this based on a condition set in the code behind. Can I access a span id like that? (the website is built using visual basic)

回答1:

You can use a Label instead of a html-span (which is also rendered as span) or you could add runat="server".

<span id="expTrainingShow" runat="server" class="clsLink" style="margin-left: 20px;" onclick="GridChanger();" ></span>

somewhere in codebehind(the span is a HtmlGenericControl on serverside):

expTrainingShow.InnerHtml = yourText ' set the text '

or

expTrainingShow.Visible = False ' hide it '

Note that Visible=False on serverside means that the control is not rendered at all on clientside, hence it does not exist in the html and can be accessed only on serverside.

If you just want to hide it but render it anyway, you should use CSS or expTrainingShow.Style.Add("display","none").

来源：https://stackoverflow.com/questions/12290332/how-to-access-span-id-in-code-behind