Javascript
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Sometimes you need two or three useful libraries to get a job done. Here are a few.
Graphical Libraries
- https://c3js.org/
- https://gionkunz.github.io/chartist-js/
- https://d3js.org/
- https://www.highcharts.com/
I prefer highcharts but there is a cost for non-commercial use.
They have a pre-revenue license for start-ups. See https://shop.highsoft.com/highcharts/high-five-license?options=cart
Validation Libraries
More Validation & Methods
- https://stackoverflow.com/questions/10281962/is-there-a-minlength-validation-attribute-in-html5
- https://www.w3.org/TR/html5/sec-forms.html#the-constraint-validation-api
- https://mdbootstrap.com/docs/jquery/forms/validation/
Pure HTML5
<form action="/action_page.php">
Country code: <input type="text" name="country_code" pattern="[A-Za-z]{3} required" title="Three letter country code">
<input type="submit">
</form>