Add attachment button to a custom new form SharePoint 2013

Question

I'm creating a new custom form using SharePoint Designer 2013.

I would like to add a attachment button to be able to upload files and images. How can this be done?

This is what im adding to my new custom new form:

   <tr>
<td width="190px" valign="top" class="ms-formlabel">
<h3 class="ms-standardheader">
<nobr>Attach Files</nobr>
</h3>
</td>
<td valign="top" class="ms-formbody" id="attachmentsOnClient" style="width: 434px">
<span dir="ltr">
<input type="file" name="fileupload0" id="onetidIOFile" size="56" title="Name"></input>
</span>
</td>
<td width="100px" valign="top" class="ms-formbody">
<input name="Button1" type="button" value="Attach" onclick='OkAttach()' style="width: 6em;
height: 1.7em" id="attachOKbutton" />
<span id="idSpace"></span>
</td>
</tr>

                    <tr id="idAttachmentsRow">
                        <td nowrap="true" valign="top" class="ms-formlabel" width="20%">
                            <SharePoint:FieldLabel ControlMode="New" FieldName="Attachments" runat="server"/>
                        </td>
                        <td valign="top" class="ms-formbody" width="80%">
                            <SharePoint:FormField runat="server" id="AttachmentsField" ControlMode="New" FieldName="Attachments" __designer:bind="{ddwrt:DataBind('i','AttachmentsField','Value','ValueChanged','ID',ddwrt:EscapeDelims(string(@ID)),'@Attachments')}"/>
                            <script>
          var elm = document.getElementById(&quot;idAttachmentsTable&quot;);
          if (elm == null || elm.rows.length == 0)
          document.getElementById(&quot;idAttachmentsRow&quot;).style.display=&apos;none&apos;;
        </script>
                        </td>
                    </tr>

Answer 1

Create a custom list form or go to your NewForm.aspx using SharePoint Designer. Place the below code where you would like to insert the Attachment Field

<tr>
<td width="190px" valign="top" class="ms-formlabel">
<h3 class="ms-standardheader">
<nobr>Attach Files</nobr>
</h3>
</td>
<td valign="top" class="ms-formbody" id="attachmentsOnClient" style="width: 434px">
<span dir="ltr">
<input type="file" name="fileupload0"  id="onetidIOFile" size="56" title="Name">              </input>
</span>
</td>
<td width="100px" valign="top" class="ms-formbody">
<input name="Button1" type="button" value="Attach" onclick='OkAttach()'       style="width: 6em;
 height: 1.7em" />
<span id="idSpace"></span>
</td>
</tr>

Reference

Answer 2

• Open the form, NewForm.aspx page of respective list in advance mode in SharePoint Designer 2013
• Find the section

<asp:Content ContentPlaceHolderId="PlaceHolderAdditionalPageHead" runat="server>"

• Insert the below section

<script src="https://ajax.aspnetcdn.com/ajax/4.0/1/MicrosoftAjax.js" 
type="text/javascript"></script>
<script src="_layouts/15/sp.runtime.js" type="text/javascript"></script>
<script src="_layouts/15/sp.js" type="text/javascript"></script>
<script type="text/javascript"> 
$(document).ready(function () {

var newRowContent ="<tr>"+
                    "<td width=\"190px\" valign=\"top\" class=\"ms-formlabel\">"+
                        "<h3 class=\"ms-standardheader\">"+
                            "<nobr>Attach Files</nobr>"+
                        "</h3>"+
                    "</td>"+
                    "<td valign=\"top\" class=\"ms-formbody\" id=\"attachmentsOnClient\" style=\"width: 434px\">"+
                        "<span dir=\"ltr\">"+
                            "<input type=\"file\" name=\"fileupload0\"  id=\"onetidIOFile\" size=\"39%\" title=\"Name\"></input>"+
                        "</span>"+
                    "</td>"+
                    "<td width=\"100px\" valign=\"top\" class=\"ms-formbody\">"+
                        "<input name=\"Button1\" type=\"button\" value=\"Attach\" onclick='OkAttach()' style=\"width: 6em; height: 3em\" />"+
                        "<span id=\"idSpace\"></span>"+
                    "</td>"+
                    "</tr>";
var hiddenAttachDispId=document.getElementById("idAttachmentsRow");
$(hiddenAttachDispId).before(newRowContent);
});
</script>

• Save it and try to add new item to the custom list or refresh (Ctl+F5) the already opened NewForm.aspx page in browser!