Home > Article > Web Front-end > Example learning of DOM operations and events in jquery-form validation_jquery

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

WBOYOriginal: 2016-05-16 17:59:071055browse

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="http://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="http://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="http://m.php.cn/article.html" class="bBlack"><i>See more</i><b></b></a></em><div class="clear"></div></div><ins class="adsbygoogle"
     style="display:block"
     data-ad-format="fluid"
     data-ad-layout-key="-6t+ed+2i-1n-4w"
     data-ad-client="ca-pub-5902227090019525"
     data-ad-slot="8966999616"></ins><script>     (adsbygoogle = window.adsbygoogle || []).push({});
</script><ul class="nphpXgwzList"><li><b></b><a href="http://m.php.cn/faq/1609.html" title="An in-depth analysis of the Bootstrap list group component" class="aBlack">An in-depth analysis of the Bootstrap list group component</a><div class="clear"></div></li><li><b></b><a href="http://m.php.cn/faq/1640.html" title="Detailed explanation of JavaScript function currying" class="aBlack">Detailed explanation of JavaScript function currying</a><div class="clear"></div></li><li><b></b><a href="http://m.php.cn/faq/1949.html" title="Complete example of JS password generation and strength detection (with demo source code download)" class="aBlack">Complete example of JS password generation and strength detection (with demo source code download)</a><div class="clear"></div></li><li><b></b><a href="http://m.php.cn/faq/2248.html" title="Angularjs integrates WeChat UI (weui)" class="aBlack">Angularjs integrates WeChat UI (weui)</a><div class="clear"></div></li><li><b></b><a href="http://m.php.cn/faq/2351.html" title="How to quickly switch between Traditional Chinese and Simplified Chinese with JavaScript and the trick for websites to support switching between Simplified and Traditional Chinese_javascript skills" class="aBlack">How to quickly switch between Traditional Chinese and Simplified Chinese with JavaScript and the trick for websites to support switching between Simplified and Traditional Chinese_javascript skills</a><div class="clear"></div></li></ul></div></div><ins class="adsbygoogle"
     style="display:block"
     data-ad-format="autorelaxed"
     data-ad-client="ca-pub-5902227090019525"
     data-ad-slot="5027754603"></ins><script>     (adsbygoogle = window.adsbygoogle || []).push({});
</script><footer><div class="footer"><div class="footertop"><img src="/static/imghwm/logo.png" alt=""><p>Public welfare online PHP training，Help PHP learners grow quickly！</p></div><div class="footermid"><a href="http://m.php.cn/about/us.html">About us</a><a href="http://m.php.cn/about/disclaimer.html">Disclaimer</a><a href="http://m.php.cn/update/article_0_1.html">Sitemap</a></div><div class="footerbottom"><p>                © php.cn All rights reserved
            </p></div></div></footer><script>isLogin = 0;</script><script type="text/javascript" src="/static/layui/layui.js"></script><script type="text/javascript" src="/static/js/global.js?4.9.47"></script></div><script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script><link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css' type='text/css' media='all'/><script type='text/javascript' src='/static/js/viewer.min.js?1'></script><script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script><script>jQuery.fn.wait = function (func, times, interval) {
    var _times = times || -1, //100次
    _interval = interval || 20, //20毫秒每次
    _self = this,
    _selector = this.selector, //选择器
    _iIntervalID; //定时器id
    if( this.length ){ //如果已经获取到了，就直接执行函数
        func && func.call(this);
    } else {
        _iIntervalID = setInterval(function() {
            if(!_times) { //是0就退出
                clearInterval(_iIntervalID);
            }
            _times <= 0 || _times--; //如果是正数就 --

_self = $(_selector); //再次选择
            if( _self.length ) { //判断是否取到
                func && func.call(_self);
                clearInterval(_iIntervalID);
            }
        }, _interval);
    }
    return this;
}
$("table.syntaxhighlighter").wait(function() {
    $('table.syntaxhighlighter').append("<p class='cnblogs_code_footer'><span class='cnblogs_code_footer_icon'></span></p>");
});
$(document).on("click", ".cnblogs_code_footer",function(){
      $(this).parents('table.syntaxhighlighter').css('display','inline-table');$(this).hide();
});
$('.nphpQianCont').viewer({navbar:true,title:false,toolbar:false,movable:false,viewed:function(){$('img').click(function(){$('.viewer-close').trigger('click');});}});
</script></body></html>