Recently I needed to create valid urls for pages using javascript. Also this time I thought it must be some out-of-the-box code for that in SharePoint. The first thing I came up  was the “Add page” dialog.  I found that the actual dialog was in the _layouts virtual folder:

/_layouts/15/CreatePublishingPageDialog.aspx

Bingo, it does the validation in the client side. This is the responsible javascript function that resides directly in the page:

Det finns ett mycket bra jQuery-tillägg som kan validera din data i en formulär på ett enkelt sätt. Se en demo. Referera till validate.js och ange rätt css-klasser på dina inputs: “required”, “error”, “url”, “valid”. Mycket smidigt.