asp.net - How to reset this span's text generated from a regularExpressionValidator at asp with javascript -

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itemprop = "text">

I block this HTML on an aspx page: 

   Td class = "normalbold" & gt; & Lt; ASP: text box runat = "server" id = "txtSendSummary" ClientIDMode = "static" CssClass = "NormalTextBox" style = "width: 170px;" Enabled = "wrong" & gt; & Lt; / Asp: text box & gt; & Lt; ASP: RegularExpressionValidator id = "txtSendSummaryValidEmail" runat = "server" ClientIDMode = "static" ControlToValidate = "txtSendSummary" errorCare = "*" ValidationExpression = "\ w + ([- + '.] \ W +) * @ \ w + ([-.] \ W +) * \ \ w + ([-.] \ W +) * "/" & Lt; / TD & gt;   
 I tried to restore it with "*".  
  document.getElementById ('txtSendaryValidEmail') value = "";   
 but still "*"! How can I reset this period of validation?  
 Thanks in advance!   
 
 
 You have two problems here at the first  span  > Value is not , so you will need to use  innerText  instead:  
  document.getElementById ('txtSendaryValidEmail'). InnerText = "";   
 The other problem you can face is that ASP.net ensures that  id  attributes on such elements are prefixing them unique Announcing your ID as  txtSendSummaryValidEmail , the end result looks something like  c001_c001_txtSendSummaryValidEmail .  
 On the basis of the browser you need to support, your best bet can be to use the CSS to match the end of the ID within a  querySelector  method: < / P> 
  document.querySelector ('[id $ = "txtSendSummaryValidEmail"]'). InnerText = "";

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