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JQuery读书笔记--JQuery-Form中的AjaxForm和AjaxSubmit的区别

来源：网络整理时间：2023/2/14 0:10:13 共 3640 浏览

JQuery中的AjaxForm和AjaxSubmit使用差不多功能也差不多。很容易误解。

按照作者的解释：
AjaxForm
ajaxForm不能提交表单。在document的ready函数中，使用ajaxForm来为AJAX提交表单进行准备。提交动作必须由submit开始
ajaxSubmit
马上由AJAX来提交表单。你可以在任何情况下进行该项提交。
option的参数
var options = {
       target:        '#output1',   // target element(s) to be updated with server response
       beforeSubmit:  showRequest,  // pre-submit callback
       success:       showResponse  // post-submit callback

       // other available options:
       //url:       url         // override for form's 'action' attribute
       //type:      type        // 'get' or 'post', override for form's 'method' attribute
       //dataType:  null        // 'xml', 'script', or 'json' (expected server response type)
       //clearForm: true        // clear all form fields after successful submit
       //resetForm: true        // reset the form after successful submit

       // $.ajax options can be used here too, for example:
       //timeout:   3000
   };

示例代码摘自：http://www.malsup.com/jquery/form/#code-samples
ajaxForm
The following code controls the HTML form beneath it. It uses ajaxForm to bind the form and demonstrates how to use pre- and post-submit callbacks
// prepare the form when the DOM is ready
$(document).ready(function() {
    var options = {
        target:        '#output1',   // target element(s) to be updated with server response
        beforeSubmit:  showRequest,  // pre-submit callback
        success:       showResponse  // post-submit callback

        // other available options:
        //url:       url         // override for form's 'action' attribute
        //type:      type        // 'get' or 'post', override for form's 'method' attribute
        //dataType:  null        // 'xml', 'script', or 'json' (expected server response type)
        //clearForm: true        // clear all form fields after successful submit
        //resetForm: true        // reset the form after successful submit

        // $.ajax options can be used here too, for example:
        //timeout:   3000
    };

    // bind form using 'ajaxForm'
    $('#myForm1').ajaxForm(options);
});

// pre-submit callback
function showRequest(formData, jqForm, options) {
    // formData is an array; here we use $.param to convert it to a string to display it
    // but the form plugin does this for you automatically when it submits the data
    var queryString = $.param(formData);

    // jqForm is a jQuery object encapsulating the form element.  To access the
    // DOM element for the form do this:
    // var formElement = jqForm[0];

    alert('About to submit: \n\n' + queryString);

    // here we could return false to prevent the form from being submitted;
    // returning anything other than false will allow the form submit to continue
    return true;
}

// post-submit callback
function showResponse(responseText, statusText)  {
    // for normal html responses, the first argument to the success callback
    // is the XMLHttpRequest object's responseText property

    // if the ajaxForm method was passed an Options Object with the dataType
    // property set to 'xml' then the first argument to the success callback
    // is the XMLHttpRequest object's responseXML property

    // if the ajaxForm method was passed an Options Object with the dataType
    // property set to 'json' then the first argument to the success callback
    // is the json data object returned by the server

    alert('status: ' + statusText + '\n\nresponseText: \n' + responseText +
        '\n\nThe output div should have already been updated with the responseText.');
}
ajaxSubmit

The following code controls the HTML form beneath it. It uses ajaxSubmit to submit the form.

// prepare the form when the DOM is ready
$(document).ready(function() {
    var options = {
        target:        '#output2',   // target element(s) to be updated with server response
        beforeSubmit:  showRequest,  // pre-submit callback
        success:       showResponse  // post-submit callback

        // other available options:
        //url:       url         // override for form's 'action' attribute
        //type:      type        // 'get' or 'post', override for form's 'method' attribute
        //dataType:  null        // 'xml', 'script', or 'json' (expected server response type)
        //clearForm: true        // clear all form fields after successful submit
        //resetForm: true        // reset the form after successful submit

        // $.ajax options can be used here too, for example:
        //timeout:   3000
    };

    // bind to the form's submit event
    $('#myForm2').submit(function() {
        // inside event callbacks 'this' is the DOM element so we first
        // wrap it in a jQuery object and then invoke ajaxSubmit
        $(this).ajaxSubmit(options);

        // !!! Important !!!
        // always return false to prevent standard browser submit and page navigation
        return false;
    });
});

// pre-submit callback
function showRequest(formData, jqForm, options) {
    // formData is an array; here we use $.param to convert it to a string to display it
    // but the form plugin does this for you automatically when it submits the data
    var queryString = $.param(formData);

    // jqForm is a jQuery object encapsulating the form element.  To access the
    // DOM element for the form do this:
    // var formElement = jqForm[0];

    alert('About to submit: \n\n' + queryString);

    // here we could return false to prevent the form from being submitted;
    // returning anything other than false will allow the form submit to continue
    return true;
}

// post-submit callback
function showResponse(responseText, statusText)  {
    // for normal html responses, the first argument to the success callback
    // is the XMLHttpRequest object's responseText property

    // if the ajaxSubmit method was passed an Options Object with the dataType
    // property set to 'xml' then the first argument to the success callback
    // is the XMLHttpRequest object's responseXML property

    // if the ajaxSubmit method was passed an Options Object with the dataType
    // property set to 'json' then the first argument to the success callback
    // is the json data object returned by the server

    alert('status: ' + statusText + '\n\nresponseText: \n' + responseText +
        '\n\nThe output div should have already been updated with the responseText.');
}

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