Quickly learn how to use jQuery plug-in Form form plug-in_jquery

The 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.
Core methods -- 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. Both ajaxForm() and ajaxSubmit() can 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 the callback function , and the following Introducing the options object, giving them 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 form submission: beforeSubmit will be called before form submission. If beforeSubmit returns false, form submission will be prevented

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('用户名,地址和自我介绍都不能为空!'); 
   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('用户名和地址不能为空，自我介绍可以为空！'); 
   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 = $('input[name=name]').fieldValue(); 
 var addressValue = $('input[name=address]').fieldValue(); 
 if (!usernameValue[0] || !addressValue[0]) { 
  alert('用户名和地址不能为空，自我介绍可以为空！'); 
  return false; 
 } 
 
 var queryString = $.param(formData); //组装数据 
 //alert(queryString); //类似 ： name=1&add=2 
 return true; 
} 

The article introduces in detail how to use the Form form plug-in. I hope everyone will study it carefully and gain something from it.