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.
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