使用jquery和.submit捕获表单提交

I'm attempting to use jQuery to capture a submit event and then send the form elements formatted as JSON to a PHP page. I'm having issues capturing the submit though, I started with a .click() event but moved to the .submit() one instead.

我正在尝试使用jQuery捕获提交事件，然后将格式化为JSON的表单元素发送到PHP页面。我在捕获提交时遇到问题，我开始使用.click（）事件，但转而使用.submit（）。

I now have the following trimmed down code.

我现在有以下修剪过的代码。

HTML

<form method="POST" id="login_form">
    <label>Username:</label>
    <input type="text" name="username" id="username"/>
    <label>Password:</label>
    <input type="password" name="password" id="password"/>
    <input type="submit" value="Submit" name="submit" class="submit" id="submit" />
</form>

Javascript

使用Javascript

$('#login_form').submit(function() {
    var data = $("#login_form :input").serializeArray();
    alert('Handler for .submit() called.');
});

4 个解决方案

#1

125

Wrap the code in document ready and prevent the default submit action:

将文档中的代码包装好，并阻止默认的提交操作：

$(function() { //shorthand document.ready function
    $('#login_form').on('submit', function(e) { //use on if jQuery 1.7+
        e.preventDefault();  //prevent form from submitting
        var data = $("#login_form :input").serializeArray();
        console.log(data); //use the console for debugging, F12 in Chrome, not alerts
    });
});

#2

try this:

尝试这个：

Use ´return false´ for to cut the flow of the event:

使用'return false'来减少事件的流程：

$('#login_form').submit(function() {
    var data = $("#login_form :input").serializeArray();
    alert('Handler for .submit() called.');
    return false;  // <- cancel event
});

Edit

编辑

corroborate if the form element with the 'length' of jQuery:

如果表单元素具有jQuery的'length'，则证实：

alert($('#login_form').length) // if is == 0, not found form
$('#login_form').submit(function() {
    var data = $("#login_form :input").serializeArray();
    alert('Handler for .submit() called.');
    return false;  // <- cancel event
});

OR:

要么：

it waits for the DOM is ready:

它等待DOM准备就绪：

jQuery(function() {

    alert($('#login_form').length) // if is == 0, not found form
    $('#login_form').submit(function() {
        var data = $("#login_form :input").serializeArray();
        alert('Handler for .submit() called.');
        return false;  // <- cancel event
    });

});

Do you put your code inside the event "ready" the document or after the DOM is ready?

您是否将代码放入事件“准备好”文档或DOM准备好之后？

#3

Just replace the form.submit function with your own implementation:

只需将form.submit函数替换为您自己的实现：

var form = document.getElementById('form');
var formSubmit = form.submit; //save reference to original submit function

form.onsubmit = function(e)
{
    formHandler();
    return false;
};

var formHandler = form.submit = function()
{
    alert('hi there');
    formSubmit(); //optionally submit the form
};

#4

Just a tip: Remember to put the code detection on document.ready, otherwise it might not work. That was my case.

只是一个提示：记得将代码检测放在document.ready上，否则它可能无效。那是我的情况。

#1

125