Show loading gif on button click

Question

1.00/5 (2 votes)

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Below is aspx code,

<asp:Button ID="submtBtn" CssClass="submitBtn"  runat="server" Text="Submit" OnClick="submtBtn_Click" Style="float: right;" />

Below is cs code

protected void submtBtn_Click(object sender, EventArgs e)
        {
           Some codes to generate pdf using itext sharp

        }

The issue here is i need to show loading icon till the pdf gets generated.I have some issues using ajax so i dont want suggestion regarding ajax.

What I have tried:

I tried with ajax, loading gif is working but pdf is not generating.

Posted 19-Jun-20 4:33am

Member 14636607

Updated 19-Jun-20 7:01am

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Richard MacCutchan 19-Jun-20 11:14am

protected void submtBtn_Click(object sender, EventArgs e)
        {
           Some codes to generate pdf using itext sharp

        }

That is not code, so it is unlikely anyone can suggest how to imrove it.

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F-ES Sitecore · Answer 1 · 2020-06-19T07:02:00

HTML

<img id="loader" style="display:none;" src="loaderImage.gif"/>
<script type="text/javascript">
    function showLoader() {
        document.getElementById("loader").style.display = 'block';
    }

</script>

<asp:Button ID="submtBtn" CssClass="submitBtn"  runat="server" Text="Submit" OnClientClick="showLoader();"
    OnClick="submtBtn_Click" Style="float: right;" />

It won't help you though, your request can only have one response so if that response is a file you can't also return html with the loader hidden, it will simply stay there and you won't be able to return any js etc to tell the image to hide.