An extremely simply way for a client-side form protection. This script is dev in VanillJS and has an hight browser support.
Guide:
Just insert:
// insert the script
<script src="easy_required.js"></script>
// and call
easy_required("#myform");
and set the parameter:
// this is an example of required field:
<input class="easy_required" data-message="Name" type="text" />
//You need this element for the popup:
<div class="popup">
<div class="error"></div>
<div class="close">
<p>x</p>
</div>
</div>
Field support: all input and checkbox.
Note: you can change the popup style or anithing else with your own CSS.
Copyright (c) 2017 Eugenio Segala
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.