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radtextbox validate url

<asp:TextBox runat="server" ID="txtOrigeenHup" CssClass="mycssMascara" Width="390px"

     TextMode="MultiLine" Text='<%# Eval("urlOrigen") %>'

     onfocus="OnFocus(this.id,'http://paginaEjemplo.com')"

     onblur="OnBlur(this.id,'http://paginaEjemplo.com')">http://paginaEjemplo.com asp>

       

function OnFocus(elementId, defaultText) {

if (document.getElementById(elementId).value == defaultText) {

    document.getElementById(elementId).className = "mycssMascara";

    document.getElementById(elementId).value = "";

}}

  function OnBlur(elementId, defaultText) {

var textValue = document.getElementById(elementId).value;

 

if (textValue == defaultText || textValue.length == 0) {

    document.getElementById(elementId).className = "mycssMascara";

    document.getElementById(elementId).value = defaultText;

}

else

    document.getElementById(elementId).className = "mycss";  }

       

.mycssMascara

{

 font-weight: normal; color: #808080; background-color: #FFFFFF; border: 1px solid #C0C0C0; letter-spacing: 0pt; word-spacing: 1pt; font-size: 14px; text-align: left; font-family: arial, helvetica, sans-serif; line-height: 1; margin: 4px; padding: 6px;

}

 

.mycss

{ font-weight: normal; color: #000000;  background-color: #FFFFFF; border: 1px solid #C0C0C0; letter-spacing:

0pt;  word-spacing: 1pt; font-size: 14px; text-align: left; font-family: arial, helvetica, sans-serif; line-height: 1; margin: 4px;  padding: 6px;

}