Cannot get workflow to trigger event receiver

Change the sequence number of the receiver in Elements.xml to a lower value so that the receiver will run before the workflows?

Another way is to actually update the list item inside the workflow, usually assigning the same value to the field will work and results in no change to the list item.

Please note that workflow status is set asynchronously, meaning if you make the workflow trigger the event receiver and inside event receiver you read the workflow status, the workflow status is not guaranteed to be correct at the time as the update happens asynchronously.

The best way to read the eventual workflow status is to write it to a list item’s field and read from there in the event receiver.

Disable button on submit using javascript to prevent double clicking

Disable button on submit instead of onclick

Use this code?

Button is not firing postBack because you have disabled this. The approach to avoid multiple postBack is to have two buttons side by side. Real and dummy. On first click hide/delete the real button and show the dummy one
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" ClientIDMode="Static" OnClientClick="disableButton();"/>

<asp:Button ID="ButtonDummy" runat="server" Text="Button" ClientIDMode="Static" OnClientClick='return false;' style="display:none;"/>
and JS:
function disableButton() {

 $("#Button1").hide();

 $("#ButtonDummy").show();

 return true;
 }
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Allow ASP.NET form to be used after downloading a file in SharePoint webpart

Solution: the most effective solution: add “_spFormOnSubmitCalled=false;_spSuppressFormOnSubmitWrapper=true;” to OnClientClick of the button

<asp:LinkButton ID=”lbExport”
runat=”server” Text=”Export”
OnClick=”lbExport_Click”
OnClientClick=”_spFormOnSubmitCalled=false;_spSuppressFormOnSubmitWrapper=true;”/>

Solution:

Add this code to the .ascx file

<script type=”text/javascript”>
    function setFormSubmitToFalse() {
        setTimeout(function () { _spFormOnSubmitCalled = false; }, 3000);
        return true;
    }
</script>

Then, for the download button, add the code to call this function after user clicks it

OnClientClick=”setFormSubmitToFalse”

Another way is to refresh the page on client after certain time

onclientclick="timedRefresh(2000)"

then in your html..

    <script type="text/JavaScript">
    <!--
    function timedRefresh(timeoutPeriod) {
        setTimeout("location.reload(true);",timeoutPeriod);
    }
    //   -->

Allow workflows to change approval status

Follow the instructions of the last answer at the end of the page.

https://social.technet.microsoft.com/Forums/office/en-US/9292c3ef-b456-4115-8b9c-bfa63782dfd5/workflow-can-use-app-permissions-feature-is-not-activating?forum=sharepointadmin

If Workflow Service Application is not displayed, enabled it by launching the Farm Configuration Wizard.