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CodePrimer

Search a living directory of web syntax. Pick a problem, copy a working sample, then adapt it.

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Tags basics 48 php 45 javascript 24 html 23 css 18 dom 18 forms 16 database 14 layout 8 sql 7 events 6 arrays 6 pdo 6 http 5 control-flow 5 a11y 5 security 4 responsive 3 components 3 media 3 flexbox 3 functions 2 auth 2 selectors 2

4 snippets

JavaScript Beginner

Live input event

How do I react as the user types?

Dom javascript forms dom
JavaScript Beginner

change event on select

How do I detect dropdown changes?

Dom javascript forms dom
JavaScript Beginner

Read input/select/textarea values

How do I read form field values in JS?

Dom javascript forms dom
JavaScript Beginner

Block empty form fields in JS

How do I stop submit when a field is blank?

Forms javascript forms

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