Trigger c# Event from JavaScript Function - javascript

I'm trying to call c# event from javascript function. I tried this:
<script type="text/javascript">
function LikeClick() {
document.getElementById('<%=Helper.ClientID %>').click();
}
</script>
<asp:Button ID="Helper" runat="server" OnClick="Helper_Click" />
But it doesn't trigger the c# event.


I believe a <asp:Button> will natively post the form back without a client side event handler. You need a control that does not natively post back but instead uses a client side click handler to call the __doPostBack() function.
Change
<asp:Button ID="Helper" runat="server" OnClick="Helper_Click" />
to this
<asp:LinkButton ID="Helper" runat="server" OnClick="Helper_Click" />

Related

OnClIck in Javascript Not Working For Image

I have OnClick Function and On ClientClick Function as
<asp:ImageButton ID="imgbtnSchedule" runat="server" ClientIDMode="Static" ImageUrl="~/images/Update2.png" ToolTip="Refresh" OnClick="imgbtnSchedule_Click" OnClientClick="return validateUpdate(1);" />
My OnClick Function Is Not Working so I Started Debugging using F12. but Here I can see my OnClick function Is Not there and Onclientclick property is showing as OnClick.

I have Onlick Function On Server side and An OnClientClick Function On
client side,I am expecting Ececution Of both OnClick and
OnClientClick,How To Achive this
base on that code
<asp:ImageButton ID="imgbtnSchedule" runat="server" ClientIDMode="Static" ImageUrl="~/images/Update2.png" ToolTip="Refresh"
OnClick="imgbtnSchedule_Click"
OnClientClick="return validateUpdate(1);" />
If the validateUpdate(1) returns false, then the imgbtnSchedule_Click will not called.

Call javascript using asp:button

I am trying to call a javascript function stored in separate js file using below code from aspx file
<asp:Panel ID="constraintPanel" runat="server">
<div class="rightColumn">
<div class="parseButtonDiv">
<asp:Button ID="Button" runat="server" class="button" Text="Parse"
OnClick="DoParseExpression();"/>
</div>
</div>
</asp:Panel>
The on click call is not going through.
Looking for suggestions
Thanks

Use OnClientClick
<asp:Button ID="Button" runat="server" class="button" Text="Parse"
OnClick="DoParseExpression();" OnClientClick="JavaScriptMethod();"/>
Client method will invoke first then it'll go to the server.

You have to add simple change to your code as below.
<asp:Button ID="Button" runat="server" class="button" Text="Parse" OnClick="DoParseExpression()" OnClientClick="return JSMethod()"/>
You can add your js file as normal way in your html page.
After adding above change at first it call Java Script method and then trigger asp method according to js method response.
NOTE: If this doesn't work, show your js method, then I can give correct solution according to your purpose.

In your case the OnClick triggers a request to server. You need to use OnClientClick https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.onclientclick(v=vs.110).aspx

Unable to call Javascript function onload a asp:button using ASP.NET4

I am unable to call a Javascript function on the OnLoad event of a asp:button
HTML
<asp:Button ID="btnFromCalOpen" runat="server" Text=" > " onLoad = "AllHide()" OnClientClick ="ShowCal()" />
Javascript
function AllHide() {
alert("Hello");
}
Please Help

You will need to use JavaScript to toggle styles like you are trying
<asp:Button ID="btnFromCalOpen" runat="server" Text="" OnClientClick ="ShowCal()" style="display:none;visiblity:hidden;" />
Original Comment You can't do onLoad with JavaScript for any button. What are you hoping to accomplish? We can help figure out that solution.

You can do it at the page level. The page has a javascript onload event.

You can't do that.
Here's why. The OnLoad event in ASP.NET for a control is fired while the server is building the page (on the web server), but before it sends it to the browser (running on the user's machine).
Code on the web server can't directly call code on the browser computer (which hasn't even got the page yet).
If you just want to hide the control, just do this in your markup:
<asp:Button ID="btnFromCalOpen" runat="server" Text=" > " visible="false" OnClientClick ="ShowCal()" />
Another approach (hidden control doesn't takes up space):
<asp:Button ID="btnFromCalOpen" runat="server" Text=" > " style="display:none;" OnClientClick ="ShowCal()" />
Another approach (hidden control takes up space)
<asp:Button ID="btnFromCalOpen" runat="server" Text=" > " style="visibility:hidden;" OnClientClick ="ShowCal()" />

DropDownList Client-side onchange stops Server-side SelectedIndexChanged event

How to call the clientside script and server-side script at same time.
I cannot able to use both at same time.
<asp:DropDownList ID="ddlModule" runat="server" Width="200px" AutoPostBack="True"
OnSelectedIndexChanged="ddlModule_SelectedIndexChanged" />
In Page_Load
ddlModule.Attributes.Add("onchange", "javascript:return validateDropDown('" + ddlModule.ClientID + "');");
if client script execute then server side not working.
Please Help..
Thanks,

One solution: in your validateDropDown JavaScript function you can postback the page
<script language='Javascript'>
__doPostBack('__Page', 'MyCustomArgument');
</script>
Here is a reference link How to call Postback from Javascript

__doPostBack and hit function

I want my javascript to fire the postback event. I have put the javascript call in the onClientClick:
<asp:Button ID="submit_btn" runat="server"
OnClientClick="javascript:doSubmit();" Text="Update" Width="75px"
Height="26px" PostBackUrl="#" />
I am verifying some values and then submitting:
__doPostBack('submit_btn', '');
The problem is that the 'click event submit_btn_Click is not being hit. I thought this would be the case! Is this wrong?

Your <asp:Button> will always generate a post-back event, and flow into your Page_OnLoad() and other initialization events. You won't need to specifically call the JavaScript method __doPostBack().

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