Workflow Activity Edit - How to handle the submit event?

[weirdyang]

I've an activity which I would like to create a dynamic list in the form.
The tricky part is to update the form element names when items are added or deleted.
For example, if the second element is deleted, my form would look like this, and when submitted I will only receive one element in the controller.

    <fieldset class="mapping-set rounded-3 p-3 border" id="0">
        <label for="JsonToExcelTask_Mapping_0__Name">Sheet Name</label>
        <input type="text" class="form-control code" id="JsonToExcelTask_Mapping_0__Name" name="JsonToExcelTask.Mapping[0].Name" value="Sheet1">
        <label for="JsonToExcelTask_Mapping_0__JsonString">JSON string</label>
        <textarea class="form-control" id="JsonToExcelTask_Mapping_0__JsonString" name="JsonToExcelTask.Mapping[0].JsonString">[ { "column1" : 1, "column2" : "name" }, { "column1" : 2, "column2" : "name2" } ] </textarea>
        <span class="field-validation-valid" data-valmsg-for="JsonToExcelTask.Mapping" data-valmsg-replace="true"></span>
        <span class="hint">The sheet to JSON mapping. Accepts liquid input.</span>
    </fieldset>
<fieldset class="mapping-set rounded-3 p-3 border" id="2">
        <label for="JsonToExcelTask_Mapping_2__Name">Sheet Name</label>
        <input type="text" class="form-control code" id="JsonToExcelTask_Mapping_2__Name" name="JsonToExcelTask.Mapping[2].Name" value="Sheet1">
        <label for="JsonToExcelTask_Mapping_2__JsonString">JSON string</label>
        <textarea class="form-control" id="JsonToExcelTask_Mapping_2__JsonString" name="JsonToExcelTask.Mapping[2].JsonString">[ { "column1" : 1, "column2" : "name}, { "column1" : 2, "column2" : "name2} ] </textarea>
        <span class="field-validation-valid" data-valmsg-for="JsonToExcelTask.Mapping" data-valmsg-replace="true"></span>
        <span class="hint">The sheet to JSON mapping. Accepts liquid input.</span>
    </fieldset>

I think it would be easier if I could construct the form body myself and do the submit, but is that possible?

[hishamco]

What if you are using HTTP Workflow, so you can handle the post from within the workflow itself