Example analysis of serialize() usage in JQuery_jquery

The example in this article describes the usage of serialize() in JQuery. Share it with everyone for your reference. The specific analysis is as follows:

1. Definition and usage of serialize():

The

serialize() method creates a standard URL-encoded text string by serializing form values. Its operation object is a jQuery object representing a collection of form elements. You can select one or more form elements (such as inputs or text fields), or the form element itself. Serialized values ​​can be used in URL query strings when making AJAX requests.

Syntax:

$(selector).serialize()

Detailed description

1. The .serialize() method creates a text string represented by standard URL encoding. It operates on a jQuery object that represents a collection of form elements.

2. The .serialize() method can operate jQuery objects that have selected individual form elements, such as , and <select>. However, it's generally easier to serialize the <form> tag itself</p> <p>3. Only "successful controls" will be serialized into strings. If you do not use a button to submit the form, the submit button's value is not serialized. If you want a form element's value to be included in a sequence string, the element must use a name attribute. <br> <br> 4. The name in the form cannot use keywords in Js and jquery. <br> For example: length<br> </p> <div class="codetitle"> <span><a style="CURSOR: pointer" data="30392" class="copybut" id="copybut30392" onclick="doCopy('code30392')"><u>Copy code</u></a></span> The code is as follows:</div> <div class="codebody" id="code30392"><form id="form1"><br> <input name="length" type="text" value="pipi" /><br> <input name="blog" type="text" value="blue submarine" /><br> </form> <p>//Use:$("#form1").serialize();</p> </div> <p>The value above cannot be obtained. <br> <br> 2. Example of serialize() in JQuery<br> <br> 1. ajax serialize()<br> </p> <div class="codetitle"> <span><a style="CURSOR: pointer" data="22106" class="copybut" id="copybut22106" onclick="doCopy('code22106')"><u>Copy code</u></a></span> The code is as follows:</div> <div class="codebody" id="code22106">$.ajax({<br> Type: "POST",<br> DataType: "json",<br> url:ajaxCallBack,<br> Data:$('#myForm').serialize(),//The ID of the form to be submitted<br> Success: function(msg){<br> alert(msg);<br> }<br> });</div> <p>2. serialize() serialize form instance<br> </p> <div class="codetitle"> <span><a style="CURSOR: pointer" data="79" class="copybut" id="copybut79" onclick="doCopy('code79')"><u>Copy code</u></a></span> The code is as follows:</div> <div class="codebody" id="code79"><script src="jquery-1.7.min.js">< /script><br> <script><br> $(function(){<br> $("#submit").click(function(){<br> ​​ alert($("#myForm").serialize());<br> });<br> });<br> </script><br> <form id="myForm"><br> Nickname <input type="text" name="username" value="admin" /><br /><br> Password <input type="password" name="password" value="admin123" /><br /><br> <input type="button" id="submit" value="serialized form" /> <br> </form></div> <p>After clicking the button, it will pop up: </p> <p>username=admin&password=admin123<br> <br> 3. Serialize is a simple wrapper for serializeArray using the param method <br> <br> 1. $.param()</p> <p>The $.param() method is the core of the serialize() method, which is used to serialize an array or object according to key/value. <br> <br> js code of param method<br> </p> <div class="codetitle"> <span><a style="CURSOR: pointer" data="39600" class="copybut" id="copybut39600" onclick="doCopy('code39600')"><u>Copy code</u></a></span> The code is as follows:</div> <div class="codebody" id="code39600">param: function( a ) {<br> ///    <summary><br> ///        This method is internal.  Use serialize() instead.<br> ///    </summary><br> ///    <param name="a" type="Map">A map of key/value pairs to serialize into a string.</param>'<br> ///    <returns type="String" /><br> ///    <private /> <p>var s = [ ];</p> <p>function add( key, value ){<br>     s[ s.length ] = encodeURIComponent(key) '=' encodeURIComponent(value);<br> };</p> <p>// If an array was passed in, assume that it is an array<br> // of form elements<br> if ( jQuery.isArray(a) || a.jquery )<br>     // Serialize the form elements<br>     jQuery.each( a, function(){<br>  add( this.name, this.value );<br>     });</p> <p>// Otherwise, assume that it's an object of key/value pairs<br> else<br>     // Serialize the key/values<br>     for ( var j in a )<br>  // If the value is an array then the key names need to be repeated<br>  if ( jQuery.isArray(a[j]) )<br>      jQuery.each( a[j], function(){<br>   add( j, this );<br>      });<br>  else<br>      add( j, jQuery.isFunction(a[j]) ? a[j]() : a[j] );</p> <p>// Return the resulting serialization<br> return s.join("&").replace(/ /g, " ");<br> }</p> </div> <p>例如：<br> </p> <div class="codetitle"> <span><a style="CURSOR: pointer" data="21038" class="copybut" id="copybut21038" onclick="doCopy('code21038')"><u>复制代码</u></a></span> 代码如下:</div> <div class="codebody" id="code21038">var obj = {a:1,b:2,c:3};<br> var k = $.param(obj);<br> alert(k);    //输出a=1&b=2&c=3</div> <br>  <br> 2、serializeArray<br>  <br> serializeArray方法是将一个表单当中的各个字段序列化成一个数组<br> serializeArray方法的jquery定义<br> <div class="codetitle"> <span><a style="CURSOR: pointer" data="3284" class="copybut" id="copybut3284" onclick="doCopy('code3284')"><u>复制代码</u></a></span> 代码如下:</div> <div class="codebody" id="code3284">serializeArray: function() {<br> ///    <summary><br> ///        Serializes all forms and form elements but returns a JSON data structure.<br> ///    </summary><br> ///    <returns type="String">A JSON data structure representing the serialized items.</returns> <p>return this.map(function(){<br>     return this.elements ? jQuery.makeArray(this.elements) : this;<br> })<br> .filter(function(){<br>     return this.name && !this.disabled &&<br>  (this.checked || /select|textarea/i.test(this.nodeName) ||<br>      /text|hidden|password|search/i.test(this.type));<br> })<br> .map(function(i, elem){<br>     var val = jQuery(this).val();<br>     return val == null ? null :<br>  jQuery.isArray(val) ?<br>      jQuery.map( val, function(val, i){<br>   return {name: elem.name, value: val};<br>      }) :<br>      {name: elem.name, value: val};<br>     }).get();<br> }</p> </div> <p>serializeArray数据例子：<br> </p> <div class="codetitle"> <span><a style="CURSOR: pointer" data="29987" class="copybut" id="copybut29987" onclick="doCopy('code29987')"><u>复制代码</u></a></span> 代码如下:</div> <div class="codebody" id="code29987">[ { <br>  name : username, <br>  value : 中国 <br>  }, { <br>  name : password, <br>  value : xxx <br> }]</div> <p>希望本文所述对大家的jQuery程序设计有所帮助。</p></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. 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