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| <a class="edit-on-gh" href="https://github.com/apache/struts-site/edit/master/source/core-developers/pure-java-script-client-side-validation.md" title="Edit this page on GitHub">Edit on GitHub</a> |
| |
| <a href="client-side-validation" title="back to Client Side Validation"><< back to Client Side Validation</a> |
| |
| <h1 class="no_toc" id="pure-javascript-client-side-validation">Pure JavaScript Client Side Validation</h1> |
| |
| <ul id="markdown-toc"> |
| <li><a href="#description" id="markdown-toc-description">Description</a></li> |
| <li><a href="#error-reporting" id="markdown-toc-error-reporting">Error reporting</a></li> |
| <li><a href="#additional-validator-support" id="markdown-toc-additional-validator-support">Additional Validator Support</a></li> |
| </ul> |
| |
| <h2 id="description">Description</h2> |
| |
| <p>Pure JavaScript client side validation is the simplest but least feature-rich type of <a href="client-side-validation">Client Side Validation</a>. |
| This type of validation uses 100% client-side JavaScript code to try to validate the values entered by the user. |
| Because the validation logic is actually repeated in the JavaScript code, it is important to understand that |
| some values will be considered acceptable by the JavaScript code but will be marked as unacceptable by the server-side <a href="validation">Validation</a>.</p> |
| |
| <p>Only the following validators are supported:</p> |
| |
| <ul> |
| <li>required validator</li> |
| <li>requiredstring validator</li> |
| <li>stringlength validator</li> |
| <li>regex validator</li> |
| <li>email validator</li> |
| <li>url validator</li> |
| <li>int validator</li> |
| <li>double validator</li> |
| </ul> |
| |
| <blockquote> |
| <p>JavaScript client validation is not available for visitor validations.</p> |
| </blockquote> |
| |
| <h2 id="error-reporting">Error reporting</h2> |
| |
| <p>Because client side validation does not talk to the server, the theme (<em>xhtml theme</em> or <em>css_xhtml theme</em> ) is responsible |
| for properly manipulating the HTML DOM to display the error message inline. The JavaScript that is responsible for doing |
| this logic is <code class="highlighter-rouge">validation.js</code> and can be found in each theme.</p> |
| |
| <blockquote> |
| <p>Errors are reported using the default validation message, not the internationalized version that the server-side might |
| be aware of. This is a known issue. You may want to try the <a href="ajax-client-side-validation">AJAX Client Side Validation</a> |
| for messages that are fully internationalized.</p> |
| </blockquote> |
| |
| <h2 id="additional-validator-support">Additional Validator Support</h2> |
| |
| <p>If you wish to add additional validator support beyond those listed, you may override the <em>xhtml theme</em> template |
| <code class="highlighter-rouge">form-close-validate.ftl</code>. This file contains the JavaScript that tries to validate each user-entered value from within |
| the browser. The <em>css_xhtml theme</em> extends the <em>xhtml theme</em> and therefore doesn’t have its own <code class="highlighter-rouge">form-close-validate.ftl</code> |
| template.</p> |
| |
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