New answers tagged validation
This works: =AND(Date >= DATE(2015, 3, 1), Date <= DATE(2016, 6, 1)) I don't know what went wrong before. We probably were confused about False triggering the error message.
You can use the HTML title attribute of your custom button. Set it dynamically on basis of whether it is enabled or disabled. You can bind onmouseover event to the button, where you will be resetting the title attribute dynamically.
I will go for JSLink. Try below https://code.msdn.microsoft.com/office/Client-side-rendering-code-80cc9b05
Isn't it possible to access the current value of a field in the formula? That way I can see if the value have been changed and only validate if it have been changed. (I'm 100% new to sharepoint)
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