jQuery form plugin jquery.form.js

jQuery Form plug-in is an excellent Ajax form plug-in that can easily and non-invasively upgrade HTML forms to support Ajax. jQuery Form has two core methods - ajaxForm() and ajaxSubmit(), which combine functionality from controlling form elements to deciding how to manage the submission process. In addition, the plug-in also includes other methods: formToArray(), formSerialize(), fieldSerialize(), fieldValue(), clearForm(), clearFields() and resetForm(), etc.

Download address: http://malsup.com/jquery/form/#download

Core method-- ajaxForm( ) and ajaxSubmit()

$('#myForm').ajaxForm(function() {   
   $('#output1').html("提交成功！欢迎下次再来！").show();    
});  
       
$('#myForm2').submit(function() {
   $(this).ajaxSubmit(function() {   
      $('#output2').html("提交成功！欢迎下次再来！").show();    
   });
   return false; //阻止表单默认提交
});

Through the two core methods of the Form plug-in, you can easily upgrade the form submission method to the Ajax submission method without modifying the HTML code structure of the form.

ajaxForm() and ajaxSubmit() both accept 0 or 1 parameter. When it is a single parameter, the parameter can be either a callback function or an options object. The above example is a callback Function, the options object is introduced below, so that they have more control over the form

var options = {
   target: '#output',          //把服务器返回的内容放入id为output的元素中    
   beforeSubmit: showRequest,  //提交前的回调函数
   success: showResponse,      //提交后的回调函数
   //url: url,                 //默认是form的action， 如果申明，则会覆盖
   //type: type,               //默认是form的method（get or post），如果申明，则会覆盖
   //dataType: null,           //html(默认), xml, script, json...接受服务端返回的类型
   //clearForm: true,          //成功提交后，清除所有表单元素的值
   //resetForm: true,          //成功提交后，重置所有表单元素的值
   timeout: 3000               //限制请求的时间，当请求大于3秒后，跳出请求
}
 
function showRequest(formData, jqForm, options){
   //formData: 数组对象，提交表单时，Form插件会以Ajax方式自动提交这些数据，格式如：[{name:user,value:val },{name:pwd,value:pwd}]
   //jqForm:   jQuery对象，封装了表单的元素   
   //options:  options对象
   var queryString = $.param(formData);   //name=1&address=2
   var formElement = jqForm[0];              //将jqForm转换为DOM对象
   var address = formElement.address.value;  //访问jqForm的DOM元素
   return true;  //只要不返回false，表单都会提交,在这里可以对表单元素进行验证
};
 
function showResponse(responseText, statusText){
   //dataType=xml
   var name = $('name', responseXML).text();
   var address = $('address', responseXML).text();
   $("#xmlout").html(name + "  " + address);
   //dataType=json
   $("#jsonout").html(data.name + "  " + data.address);
};
 
$("#myForm").ajaxForm(options);
 
$("#myForm2").submit(funtion(){
   $(this).ajaxSubmit(options);
   return false;   //阻止表单默认提交
});

Verify before the form is submitted: beforeSubmit will be called before the form is submitted. If beforeSubmit returns false, It will prevent form submission

beforeSubmit: validate
function validate(formData, jqForm, options) { //在这里对表单进行验证，如果不符合规则，将返回false来阻止表单提交，直到符合规则为止
   //方式一：利用formData参数
   for (var i=0; i < formData.length; i++) {
       if (!formData[i].value) {
            alert(&#39;用户名,地址和自我介绍都不能为空!&#39;);
            return false;
        }
    } 
 
   //方式二：利用jqForm对象
   var form = jqForm[0]; //把表单转化为dom对象
      if (!form.name.value || !form.address.value) {
            alert(&#39;用户名和地址不能为空，自我介绍可以为空！&#39;);
            return false;
      }
 
   //方式三：利用fieldValue()方法，fieldValue 是表单插件的一个方法，它能找出表单中的元素的值，返回一个集合。
   var usernameValue = $(&#39;input[name=name]&#39;).fieldValue();
   var addressValue = $(&#39;input[name=address]&#39;).fieldValue();
   if (!usernameValue[0] || !addressValue[0]) {
      alert(&#39;用户名和地址不能为空，自我介绍可以为空！&#39;);
      return false;
   }
 
    var queryString = $.param(formData); //组装数据
    //alert(queryString); //类似 ： name=1&add=2  
    return true;
}

Recommended tutorial: "JS Tutorial"

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