如何使用JavaScript/jQuery获取表单数据?
是否有一种简单的单行方式来获取表单的数据,就像以经典的HTML方式提交表单一样 例如:如何使用JavaScript/jQuery获取表单数据?,javascript,jquery,forms,Javascript,Jquery,Forms,是否有一种简单的单行方式来获取表单的数据,就像以经典的HTML方式提交表单一样 例如: <form> <input type="radio" name="foo" value="1" checked="checked" /> <input type="radio" name="foo" value="0" /> <input name="bar" value="xxx" /> <select name="thi
<form>
<input type="radio" name="foo" value="1" checked="checked" />
<input type="radio" name="foo" value="0" />
<input name="bar" value="xxx" />
<select name="this">
<option value="hi" selected="selected">Hi</option>
<option value="ho">Ho</option>
</form>
这样的东西太简单了,因为它(正确地)不包括文本区域、选择、单选按钮和复选框:
$("#form input").each(function () {
data[theFieldName] = theFieldValue;
});
除此之外,你可能想看看
使用,返回一个数组:
[
{"name":"foo","value":"1"},
{"name":"bar","value":"xxx"},
{"name":"this","value":"hi"}
]
"foo=1&bar=xxx&this=hi"
另一个选项是,它返回一个字符串:
[
{"name":"foo","value":"1"},
{"name":"bar","value":"xxx"},
{"name":"this","value":"hi"}
]
"foo=1&bar=xxx&this=hi"
看一看这将把所有表单字段附加到JavaScript对象“res”: 使用.serializeArray()以数组格式获取数据,然后将其转换为对象:
function getFormObj(formId) {
var formObj = {};
var inputs = $('#'+formId).serializeArray();
$.each(inputs, function (i, input) {
formObj[input.name] = input.value;
});
return formObj;
}
基于,返回键值对
var data = $('#form').serializeArray().reduce(function(obj, item) {
obj[item.name] = item.value;
return obj;
}, {});
你们都不完全正确。你不能写:
formObj[input.name] = input.value;
因为这样,如果您有multiselect列表,它的值将被最后一个列表覆盖,因为它被传输为:“param1”:“value1”,“param1”:“value2”
因此,正确的方法是:
if (formData[input.name] === undefined) {
formData[input.name] = input.value;
}
else {
var inputFieldArray = $.merge([], $.isArray(formData[input.name]) ? formData[input.name] : [formData[input.name]]);
$.merge(inputFieldArray, [input.value]);
formData[input.name] = $.merge([], inputFieldArray);
}
这里有一个非常简单和简短的解决方案,甚至不需要Jquery
var formElements=document.getElementById("myForm").elements;
var postData={};
for (var i=0; i<formElements.length; i++)
if (formElements[i].type!="submit")//we dont want to include the submit-buttom
postData[formElements[i].name]=formElements[i].value;
var formElements=document.getElementById(“myForm”).elements;
var postData={};
对于(var i=0;i您也可以使用对象;FormData对象允许您编译一组键/值对,以便使用XMLHttpRequest发送。它主要用于发送表单数据,但可以独立于表单使用,以便传输键控数据
var formElement = document.getElementById("myform_id");
var formData = new FormData(formElement);
console.log(formData);
2014年最新答案:是这样吗
var formData = new FormData(document.querySelector('form'))
然后,您可以按原样发布formData—它包含表单中使用的所有名称和值。此方法应该可以做到这一点。它将表单数据序列化,然后将其转换为对象。同时还要处理多组复选框
function getFormObj(formId) {
var formParams = {};
$('#' + formId)
.serializeArray()
.forEach(function(item) {
if (formParams[item.name]) {
formParams[item.name] = [formParams[item.name]];
formParams[item.name].push(item.value)
} else {
formParams[item.name] = item.value
}
});
return formParams;
}
我编写了一个库来解决这个问题:。它采用一个表单,遍历每个输入,并构建一个易于阅读的JSON对象
假设您有以下表格:
<form enctype='application/json'>
<input name='places[0][city]' value='New York City'>
<input type='number' name='places[0][population]' value='8175133'>
<input name='places[1][city]' value='Los Angeles'>
<input type='number' name='places[1][population]' value='3792621'>
<input name='places[2][city]' value='Chicago'>
<input type='number' name='places[2][population]' value='2695598'>
</form>
这是您的表单。如果您使用的是jQuery,这里有一个小函数,可以完成您想要的功能
首先,将ID添加到表单中(除非它是页面上唯一的表单,否则您可以使用“表单”作为dom查询)
这是一个只支持JavaScript的实现,它可以正确地处理复选框、单选按钮和滑块(可能还有其他输入类型,但我只测试了这些类型)
函数setOrPush(目标,val){
var结果=val;
如果(目标){
结果=[目标];
结果:推送(val);
}
返回结果;
}
函数getFormResults(formElement){
var formElements=formElement.elements;
var formParams={};
var i=0;
var-elem=null;
对于(i=0;i
工作示例:
函数setOrPush(目标,val){
var结果=val;
如果(目标){
结果=[目标];
结果:推送(val);
}
返回结果;
}
函数getFormResults(formElement){
var formElements=formElement.elements;
var formParams={};
var i=0;
var-elem=null;
对于(i=0;i
什么是a
A.
B
C
D
A.
A和/或B
A.
B
好啊
您可以从表单中获取对象或JSON
要使用它:
var object=formService.getObjectFormFields(“#idform”)
我编写了一个函数,负责多个复选框和多个选择。在这些情况下,它返回一个数组
function getFormData(formId) {
return $('#' + formId).serializeArray().reduce(function (obj, item) {
var name = item.name,
value = item.value;
if (obj.hasOwnProperty(name)) {
if (typeof obj[name] == "string") {
obj[name] = [obj[name]];
obj[name].push(value);
} else {
obj[name].push(value);
}
} else {
obj[name] = value;
}
return obj;
}, {});
}
我用这个:
jQuery插件
(function($){
$.fn.getFormData = function(){
var data = {};
var dataArray = $(this).serializeArray();
for(var i=0;i<dataArray.length;i++){
data[dataArray[i].name] = dataArray[i].value;
}
return data;
}
})(jQuery);
它将解决以下问题:无法使用MultiSelect。显示表单输入元素字段和输入文件,以便在不刷新页面的情况下提交表单,并获取其中包含文件的所有值
这是我编写的一个很好的vanilla JS函数,用于将表单数据提取为对象。它还具有向对象中插入附加内容和清除表单输入字段的选项
const extractFormData = ({ form, clear, add }) => {
return [].slice.call(form.children).filter(node => node.nodeName === 'INPUT')
.reduce((formData, input) => {
const value = input.value
if (clear) { input.value = '' }
return {
...formData,
[input.name]: value
}
}, add)
}
下面是一个将其用于post请求的示例:
submitGrudge(e) {
e.preventDefault()
const form = e.target
const add = { id: Date.now(), forgiven: false }
const grudge = extractFormData({ form, add, clear: true })
// grudge = {
// "name": "Example name",
// "offense": "Example string",
// "date": "2017-02-16",
// "id": 1487877281983,
// "forgiven": false
// }
fetch('http://localhost:3001/api/grudge', {
method: 'post',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(grudge)
})
.then(response => response.json())
.then(grudges => this.setState({ grudges }))
.catch(err => console.log('error: ', err))
}
这是一个吹毛求疵的回答,但让我解释一下为什么我会这样做
{
"foo": "1",
"bar": "xxx",
"this": "hi"
}
var formData = new FormData($('#form-id'));
params = $('#form-id').serializeArray();
$.each(params, function(i, val) {
formData.append(val.name, val.value);
});
function setOrPush(target, val) {
var result = val;
if (target) {
result = [target];
result.push(val);
}
return result;
}
function getFormResults(formElement) {
var formElements = formElement.elements;
var formParams = {};
var i = 0;
var elem = null;
for (i = 0; i < formElements.length; i += 1) {
elem = formElements[i];
switch (elem.type) {
case 'submit':
break;
case 'radio':
if (elem.checked) {
formParams[elem.name] = elem.value;
}
break;
case 'checkbox':
if (elem.checked) {
formParams[elem.name] = setOrPush(formParams[elem.name], elem.value);
}
break;
default:
formParams[elem.name] = setOrPush(formParams[elem.name], elem.value);
}
}
return formParams;
}
function getFormData(formId) {
return $('#' + formId).serializeArray().reduce(function (obj, item) {
var name = item.name,
value = item.value;
if (obj.hasOwnProperty(name)) {
if (typeof obj[name] == "string") {
obj[name] = [obj[name]];
obj[name].push(value);
} else {
obj[name].push(value);
}
} else {
obj[name] = value;
}
return obj;
}, {});
}
function getFormData($form){
var unindexed_array = $form.serializeArray();
var indexed_array = {};
$.map(unindexed_array, function(n, i){
if(indexed_array[n['name']] == undefined){
indexed_array[n['name']] = [n['value']];
}else{
indexed_array[n['name']].push(n['value']);
}
});
return indexed_array;
}
(function($){
$.fn.getFormData = function(){
var data = {};
var dataArray = $(this).serializeArray();
for(var i=0;i<dataArray.length;i++){
data[dataArray[i].name] = dataArray[i].value;
}
return data;
}
})(jQuery);
<form id='myform'>
<input name='myVar1' />
<input name='myVar2' />
</form>
var myData = $("#myForm").getFormData();
$(form).serializeArray().reduce(function (obj, item) {
if (obj[item.name]) {
if ($.isArray(obj[item.name])) {
obj[item.name].push(item.value);
} else {
var previousValue = obj[item.name];
obj[item.name] = [previousValue, item.value];
}
} else {
obj[item.name] = item.value;
}
return obj;
}, {});
const extractFormData = ({ form, clear, add }) => {
return [].slice.call(form.children).filter(node => node.nodeName === 'INPUT')
.reduce((formData, input) => {
const value = input.value
if (clear) { input.value = '' }
return {
...formData,
[input.name]: value
}
}, add)
}
submitGrudge(e) {
e.preventDefault()
const form = e.target
const add = { id: Date.now(), forgiven: false }
const grudge = extractFormData({ form, add, clear: true })
// grudge = {
// "name": "Example name",
// "offense": "Example string",
// "date": "2017-02-16",
// "id": 1487877281983,
// "forgiven": false
// }
fetch('http://localhost:3001/api/grudge', {
method: 'post',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(grudge)
})
.then(response => response.json())
.then(grudges => this.setState({ grudges }))
.catch(err => console.log('error: ', err))
}
document.querySelector('form').addEventListener('submit', (e) => {
const formData = new FormData(e.target);
// Now you can use formData.get('foo'), for example.
// Don't forget e.preventDefault() if you want to stop normal form .submission
});
function getFormData(form) {
var rawJson = form.serializeArray();
var model = {};
$.map(rawJson, function (n, i) {
model[n['name']] = n['value'];
});
return model;
}
var form_data = $("#form").getFormObject();
var Form = {
_form: null,
_validate: function(){
if(!this._form || this._form.tagName.toLowerCase() !== "form") return false;
if(!this._form.elements.length) return false;
}, _loopFields: function(callback){
var elements = this._form.elements;
for(var i = 0; i < elements.length; i++){
var element = form.elements[i];
if(name !== ""){
callback(this._valueOfField(element));
}
}
}, _valueOfField: function(element){
var type = element.type;
var name = element.name.trim();
var nodeName = element.nodeName.toLowerCase();
switch(nodeName){
case "input":
if(type === "radio" || type === "checkbox"){
if(element.checked){
return element.value;
}
}
return element.value;
break;
case "select":
if(type === "select-multiple"){
for(var i = 0; i < element.options.length; i++){
if(options[i].selected){
return element.value;
}
}
}
return element.value;
break;
case "button":
switch(type){
case "reset":
case "submit":
case "button":
return element.value;
break;
}
break;
}
}, serialize: function(form){
var data = {};
this._form = form;
if(this._validate()){
this._loopFields(function(value){
if(value !== null) data[name] = value;
});
}
return data;
}
};
<!-- { username: "username", password: "password" } !-->
<input type="text" value="username">
<input type="password" value="password">
/**
* Get the values from a form
* @param formId ( ID without the # )
* @returns {object}
*/
function getFormValues( formId )
{
let postData = {};
let form = document.forms[formId];
let formData = new FormData( form );
for ( const value of formData.entries() )
{
let container = postData;
let key = value[0];
let arrayKeys = key.match( /\[[\w\-]*\]/g ); // Check for any arrays
if ( arrayKeys !== null )
{
arrayKeys.unshift( key.substr( 0, key.search( /\[/ ) ) ); // prepend the first key to the list
for ( let i = 0, count = arrayKeys.length, lastRun = count - 1; i < count; i++ )
{
let _key = arrayKeys[i];
_key = _key.replace( "[", '' ).replace( "]", '' ); // Remove the brackets []
if ( _key === '' )
{
if ( ! Array.isArray( container ) )
{
container = [];
}
_key = container.length;
}
if ( ! (_key in container) ) // Create an object for the key if it doesn't exist
{
if ( i !== lastRun && arrayKeys[i + 1] === '[]' )
{
container[_key] = [];
}
else
{
container[_key] = {};
}
}
if ( i !== lastRun ) // Until we're the last item, swap container with it's child
{
container = container[_key];
}
key = _key;
}
}
container[key] = value[1]; // finally assign the value
}
return postData;
}
document.querySelector('form').addEventListener('submit', (e) => {
const data = Object.fromEntries(new FormData(e.target).entries());
console.log(data)
});
{ name: 'Stackoverflow' }