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Example learning of DOM operations and events in jquery-form validation_jquery

WBOYOriginal: 2016-05-16 17:59:071087browse

Obviously, doing so will result in a better user experience.
html code:

Copy code The code is as follows:

jquery code:

Copy code The code is as follows:

Okay, now let’s analyze the jquery statements inside in detail.
Look at the DOM operation statement first
$('form:input') This is used to find all the ,

, <select>, <button> elements under the form element . <br>Similarly, there are $(':text'), $(':checkbox'), etc. Anyway, as long as you understand that only within the form, you can get the corresponding elements through the form selector. <br>parent() is the parent node that finds the matching element. find() is used to search for elements that match an expression. remove() is used to delete elements. <br>is() uses an expression to check the element collection of the current selector, and returns true if there is at least one matching element. <br>appendTo() is to add an element to another element. <br>triggerHandler() is a characteristic method that triggers specific events on the element. <br>Look at the event statement again. <br>keyup() is triggered when the key is pressed upward. <br>It should be easy to understand the above code after understanding each method <br>You may have questions about this code. $parent.find(".formtips").remove(); <br>This sentence is to ensure that there is only one element prompted later. If there is no such sentence, prompt elements will be added all the time.</div><div class="nphpQianMsg"><div class="clear"></div></div><div class="nphpQianSheng"><span>Statement：</span><div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn</div></div></div><div class="nphpSytBox"><span>Previous article：<a class="dBlack" title="JS form validation encyclopedia_form effects" href="https://m.php.cn/faq/19422.html">JS form validation encyclopedia_form effects</a></span><span>Next article：<a class="dBlack" title="JS form validation encyclopedia_form effects" href="https://m.php.cn/faq/19424.html">JS form validation encyclopedia_form effects</a></span></div><div class="nphpSytBox2"><div class="nphpZbktTitle"><h2>Related articles</h2><em><a href="https://m.php.cn/article.html" class="bBlack"><i>See more</i><b></b></a></em><div class="clear"></div></div><ins class="adsbygoogle"
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