You may first download the latest jquery file from jquery.com.
asp.net webform - design page
<body>
<form id=\"form1\" runat=\"server\">
<div>
<asp:HiddenField ID=\"HiddenField1\" runat=\"server\" />
<asp:Label ID=\"lblSiteName\" runat=\"server\"></asp:Label>
</div>
</form>
<script type=\"text/javascript\" src=\"js/jquery-1.3.2.min.js\"></script>
<script type=\"text/javascript\">
$(function () {
//reading hidden field value
var mySite = $(\'#HiddenField1\').val();
//displaying the value in an asp.net Label control
$(\'#lblSiteName\').html(\'My site is: \' + mySite);
//setting value of HiddenField control
$(\'#HiddenField1\').val(\'New site is: http://asp.net\')
});
</script>
</body>
asp.net webform - code page (in c#)
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
HiddenField1.Value = "http://dotnetspidor.blogspot.com";
}
}
Known issueIf you have put the asp.net HiddenField control below the script tags, you may end up reading 'undefined' values. To solve the issue, I recommend putting the hidden fields at the top of the page just below the form tag.
Further, if you are using asp.net Master Page, please make changes in the jquery codes respectively. In such case, I recommend the following syntax:
var mySite=$('[id$=HiddenField1]').val();The system $= means the value that end with HiddenField1. This works since you usually see the id HiddenFiled1 used with master page rendered as ctl00_ContentPlaceholder1_HiddenField1.
Happy programming!!
3 comments:
very usefull
salam kenal bos. lagi jalan jalan pagi nih
Nice article... on fetching the hidden field value.
Would like to add few more points:
1. Hidden field values altered at client side are accessible because it is stored in an encoded format in ViewState.
2. Always use clientID to access the control's Id instead of using
var mySite=$('[id$=HiddenField1]').val();
e.g
var hiddenField1= document.getElementById(‘<%=HiddenField1.ClientID %>’);
Click here to read more on asp.net.
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