Javascript hidden name value

JavaScript » Objects » Hidden

A Hidden object provides a text object on a form that is hidden from the user and is created with every instance of an HTML tag with the type attribute set to ‘hidden’. A Hidden object is used to pass name/value pairs when the form is submitted. These objects are then stored in the elements array of the parent form and accessed using either the name defined within the HTML tag or an integer (with ‘0’ being the first element defined, in source order, in the specified form).

Examples

Code:

function getHidden() y=myForm.objHidden.value
self.alert(«The Hidden object’s value is : » + y)
>

Explanation:

This example creates a button that, when clicked, displays the Hidden object’s value in an alert box.

Properties

This specifies a function to create an object’s property and is inherited by all objects from their prototype.

This property returns a reference to the parent Form of the Hidden object.

This property sets or returns the value of the Hidden object’s name attribute.

Syntax: Object.prototype.name = value

This allows the addition of properties and methods to any object.

Every element on a form has an associated type property. In the case of a Hidden object, the value of this property is always «hidden».

This property sets or returns the Hidden object’s value attribute. This is the text that is held in the Hidden object until the form is submitted.

Methods

The eval method is deprecated as a method of Object, but is still used as a high level function. It evaluates a string of JavaScript in the context of an object.

The toSource method returns a literal representing the source code of an object. This can then be used to create a new object.

The toString method returns a string representing a specified object.

This method removes a watchpoint set for an object and property name with the watch method.

This method returns a primitive value for a specified object.

Syntax: Object.watch(property, handlerfunction)

This method adds a watchpoint to a property of the object.

Источник

Как получить значение?

И еще как лучше через аякс получать какие то значения? Например ответ аякса html и несколько значений, я их записываю в хидден а потом по идиотски вытаскиваю. Как лучше это делать?

var $input = $("input:hidden"); // В общем получаете элемент alert($input.val());

если на обычном javascript

var input = document.querySelector("input[type='hidden']"); alert(input.value);

А что касается аякса, что мешает сразу делать с данными то, что вы хотите, не записывая их в input?

shqn: спасибо) Ну не всегда так получается, например нужно получить кусок html и кол-во чего-то, html засунуть в какой то класс, а кол-во чего то заменить в другом месте, как быть в таких ситуациях?)

shqn: я наверно плохо объяснил, но мне кажется этот код не сработает. Смотрите, идет ajax запрос, в переменную data попадает ответ ajax — html. Теперь в переменной data html код, в html коде есть hidden элемент, как через переменную data в которой находится html код, получить значение hiddena?

therealvetalhidden: Обернуть все это в $. То есть будет примерно так:

function(data) var $content = $(data);
var $input = $content.find(«input:hidden»);
alert($input.val());
>

Евгений: спасибо) я как бы вроде понимаю что нужно json но пока его плоха знаю, тем более смотрю далеко не все его юзают, тот же контакт присылает ответ в таком виде 123. А я эти 1 2 3 записываю в хидден и на клиенте их достаю)

therealvetalhidden: JSON как раз юзают все и контакт в том числе! В вк могут некоторые единицы тянуться целым HTML куском, но никак не для передачи данных, а для передачи готового шаблона!) А JSON нечего знать! Это обычный массив, преобразованный в строку специального формата. В PHP json_encode сделает свое дело!

Источник

How to set the value of a input hidden field through javascript?

Setting the value of an input hidden field can be done through JavaScript. Input hidden fields are used to store data on a web page that is not meant to be seen by the user, but rather used for processing by the web page’s scripts. It’s important to understand how to access and modify the value of these fields in order to make changes to the data that’s being stored. In this article, we’ll go over several methods for changing the value of an input hidden field through JavaScript.

Method 1: Using the value Property

To set the value of an input hidden field through JavaScript, you can use the value property. Here is an example code:

// Get the input hidden field element const hiddenInput = document.querySelector('input[type="hidden"]'); // Set the value of the input hidden field hiddenInput.value = 'new value';

1. First, we use document.querySelector() to get the input hidden field element. We pass ‘input[type=»hidden»]’ as the selector to select the input element with type=»hidden» .
2. Then, we set the value property of the input hidden field element to the new value ‘new value’ .

That’s it! With these two lines of code, you can set the value of an input hidden field through JavaScript.

Here is another example code that shows how to set the value of an input hidden field dynamically based on user input:

label for="username">Username:label> input type="text" id="username"> input type="hidden" id="username-hidden"> script> const usernameInput = document.querySelector('#username'); const usernameHiddenInput = document.querySelector('#username-hidden'); usernameInput.addEventListener('input', (event) =>  usernameHiddenInput.value = event.target.value; >); script>

1. We have an input text field with id=»username» and an input hidden field with id=»username-hidden» .
2. We use document.querySelector() to get both input fields.
3. We add an event listener to the input text field for the ‘input’ event. This event is triggered every time the user types something in the input field.
4. In the event listener, we set the value of the input hidden field to the value of the input text field using the event.target.value property. This way, the value of the input hidden field is updated dynamically based on user input.

I hope these examples help you understand how to set the value of an input hidden field through JavaScript using the value property.

Method 2: Using the setAttribute() Method

To set the value of an input hidden field through JavaScript using the setAttribute() method, follow these steps:

1. First, select the input field using document.querySelector() method. For example, to select an input field with an ID of «myInputField», use the following code:

const inputField = document.querySelector('#myInputField');

1. Next, use the setAttribute() method to set the value of the input field. For example, to set the value to «Hello, World!», use the following code:

inputField.setAttribute('value', 'Hello, World!');

Here’s the complete code example:

const inputField = document.querySelector('#myInputField'); inputField.setAttribute('value', 'Hello, World!');

You can also set other attributes of the input field using the setAttribute() method. For example, to set the name attribute of the input field, use the following code:

inputField.setAttribute('name', 'myInputFieldName');

You can also set multiple attributes at once using an object. For example, to set both the value and name attributes of the input field, use the following code:

inputField.setAttribute('value', 'Hello, World!'); inputField.setAttribute('name', 'myInputFieldName');

Or, you can use an object to set both attributes at once:

That’s it! Using the setAttribute() method is a simple and effective way to set the value of an input hidden field through JavaScript.

Method 3: Using jQuery

To set the value of an input hidden field using jQuery, you can use the .val() function. Here is an example code:

// Get the input hidden field by its ID var myInput = $('#myInputId'); // Set the value of the input hidden field myInput.val('new value');

In the above example, myInputId is the ID of the input hidden field that you want to set the value for. The .val() function is used to set the value of the input field to ‘new value’ .

Another way to set the value of an input hidden field using jQuery is to use the .attr() function. Here is an example code:

// Get the input hidden field by its ID var myInput = $('#myInputId'); // Set the value of the input hidden field using the attr() function myInput.attr('value', 'new value');

In the above example, myInputId is the ID of the input hidden field that you want to set the value for. The .attr() function is used to set the value attribute of the input field to ‘new value’ .

You can also set the value of an input hidden field using jQuery by chaining the functions together. Here is an example code:

// Set the value of the input hidden field using chaining $('#myInputId').val('new value').attr('value', 'new value');

In the above example, myInputId is the ID of the input hidden field that you want to set the value for. The .val() function is used to set the value of the input field to ‘new value’ , and then the .attr() function is used to set the value attribute of the input field to ‘new value’ .

Источник

Input Hidden value Property

Get the value of the value attribute of a hidden input field:

Description

The value property sets or returns the value of the value attribute of the hidden input field.

The value attribute defines the default value of the hidden input field.

Browser Support

Syntax

Return the value property:

Property Values

Technical Details

More Examples

Example

Change the value of the hidden field:

Example

Submitting a form — How to change the value of the hidden field:

document.getElementById(«myInput»).value = «USA»;
document.getElementById(«demo»).innerHTML = «The value of the value attribute was changed. Try to submit the form again.»;

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