To add a custom Quick Edit button to a page or view, add a Script Editor Web Part and embed the following code. Make sure you change the number in [WPQ2SchemaData] to the ID of the Web Part you want to Quick Edit. You can find that by inspecting the list or library Web Part using Developer Tools (F12).
<!DOCTYPE html>
<html>
<body>
<button onclick="QuickEditFunction();return false;">Quick Edit</button>
<script>
function QuickEditFunction()
{
InitGridFromView(window['WPQ2SchemaData'].View);
}
</script>
</body>
</html>
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