My modal popup by onclientclick not working

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My program has a button (btnFilter) to filter the name column. It takes some time and I introduced a Modal popup window upon clicking the same button using the OnClientClick event but it has no effect at all. Please help.

What I have tried:

I tried these coding:

HTML

HTML

<div id="divStatus" class="divUserStatusHide"></div>
    <div id="modal" class="modal" style="background-color:rgba(64,64,64,0.5);width:100%;height:100%;z-index:1000;display:none";></div>
    <div id="wait" class="modal" style="width:300px;height:50px;margin:100px auto 0 auto;display:none;background-color:#fff;z-index:1001;text-align:center;">
     PLEASE WAIT...
</div>

button defined in vb code behind:

VB.NET

btn = New Button
btn.ID = "btnFilter"
btn.CssClass = "btnShort"
btn.Text = com.Convert(Resources.Resource.COMMON_Filter)
btn.Attributes("onclick") = "javascript:document.location='Home.aspx?fid=" & iFID & "&name=' + document.getElementById('txtName').value; return false;"
btn.Attributes("onclientclick") = "javascript:pleaseWait();"        
cell.Controls.Add(btn)

JavaScript

function pleaseWait() {
    document.getElementById("modal").style.display = "block";
    document.getElementById("wait").style.display = "block";
    return true;
}

Posted 24-Nov-20 21:50pm

cora chan

Updated 24-Nov-20 22:15pm

Richard Deeming

v2

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Richard Deeming · Answer 1 · 2020-11-24T22:15:00

onclientclick is not an HTML attribute. It is a server-side property used for writing the client-side onclick attribute, working around the fact that the OnClick property wires up the server-side click event.

ASPX

<asp:Button runat="server" OnClick="Server-side click event handler" OnClientClick="Client-side 'onclick' attribute" .../>

You need to put both sets of client-side code in the onclick attribute:

VB.NET

btn.Attributes("onclick") = "javascript:pleaseWait(); document.location='Home.aspx?fid=" & iFID & "&name=' + encodeURIComponent(document.getElementById('txtName').value); return false;"