Html input type button title

Html input type button title

The source for this interactive example is stored in a GitHub repository. If you’d like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Value	A DOMString used as the button’s label
Events	click
Supported common attributes	type , and value
IDL attributes	value
Methods	None

Value

An elements’ value attribute contains a DOMString that is used as the button’s label.

If you don’t specify a value , you get an empty button:

Using buttons

A simple button

We’ll begin by creating a simple button with a click event handler that starts our machine (well, it toggles the value of the button and the text content of the following paragraph):

const button = document.querySelector('input'); const paragraph = document.querySelector('p'); button.addEventListener('click', updateButton); function updateButton() < if (button.value === 'Start machine') < button.value = 'Stop machine'; paragraph.textContent = 'The machine has started!'; >else < button.value = 'Start machine'; paragraph.textContent = 'The machine is stopped.'; >>

The script gets a reference to the HTMLInputElement object representing the in the DOM, saving this refence in the variable button . addEventListener() is then used to establish a function that will be run when click events occur on the button.

Adding keyboard shortcuts to buttons

Keyboard shortcuts, also known as access keys and keyboard equivalents, let the user trigger a button using a key or combination of keys on the keyboard. To add a keyboard shortcut to a button — just as you would with any for which it makes sense — you use the accesskey global attribute.

In this example, s is specified as the access key (you’ll need to press s plus the particular modifier keys for your browser/OS combination; see accesskey for a useful list of those).

const button = document.querySelector('input'); const paragraph = document.querySelector('p'); button.addEventListener('click', updateButton); function updateButton() < if (button.value === 'Start machine') < button.value = 'Stop machine'; paragraph.textContent = 'The machine has started!'; >else < button.value = 'Start machine'; paragraph.textContent = 'The machine is stopped.'; >>

Note: The problem with the above example of course is that the user will not know what the access key is! In a real site, you’d have to provide this information in a way that doesn’t intefere with the site design (for example by providing an easily accessible link that points to information on what the site accesskeys are).

Disabling and enabling a button

To disable a button, simply specify the disabled global attribute on it, like so:

You can enable and disable buttons at run time by simply setting disabled to true or false . In this example our button starts off enabled, but if you press it, it is disabled using button.disabled = true . A setTimeout() function is then used to reset the button back to its enabled state after two seconds.

Hidden code 1

const button = document.querySelector('input'); button.addEventListener('click', disableButton); function disableButton() < button.disabled = true; button.value = 'Disabled'; window.setTimeout(function() < button.disabled = false; button.value = 'Enabled'; >, 2000); >

If the disabled attribute isn’t specified, the button inherits its disabled state from its parent element. This makes it possible to enable and disable groups of elements all at once by enclosing them in a container such as a element, and then setting disabled on the container.

The example below shows this in action. This is very similar to the previous example, except that the disabled attribute is set on the when the first button is pressed — this causes all three buttons to be disabled until the two second timeout has passed.

Hidden code 2

const button = document.querySelector('input'); const fieldset = document.querySelector('fieldset'); button.addEventListener('click', disableButton); function disableButton() < fieldset.disabled = true; window.setTimeout(function() < fieldset.disabled = false; >, 2000); >

Note: Firefox will, unlike other browsers, by default, persist the dynamic disabled state of a across page loads. Use the autocomplete attribute to control this feature.

Validation

Buttons don’t participate in constraint validation; they have no real value to be constrained.

Examples

  30 
Add suitable fallback here.
 

body < background: #ccc; margin: 0; overflow: hidden; >.toolbar < background: #ccc; width: 150px; height: 75px; padding: 5px; >input[type=»color»], input[type=»button»] < width: 90%; margin: 0 auto; display: block; >input[type=»range»] < width: 70%; >span

var canvas = document.querySelector('.myCanvas'); var width = canvas.width = window.innerWidth; var height = canvas.height = window.innerHeight-85; var ctx = canvas.getContext('2d'); ctx.fillStyle = 'rgb(0,0,0)'; ctx.fillRect(0,0,width,height); var colorPicker = document.querySelector('input[type="color"]'); var sizePicker = document.querySelector('input[type="range"]'); var output = document.querySelector('.output'); var clearBtn = document.querySelector('input[type="button"]'); // covert degrees to radians function degToRad(degrees) < return degrees * Math.PI / 180; >; // update sizepicker output value sizePicker.oninput = function() < output.textContent = sizePicker.value; >// store mouse pointer coordinates, and whether the button is pressed var curX; var curY; var pressed = false; // update mouse pointer coordinates document.onmousemove = function(e) < curX = (window.Event) ? e.pageX : e.clientX + (document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft); curY = (window.Event) ? e.pageY : e.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop); >canvas.onmousedown = function() < pressed = true; >; canvas.onmouseup = function() < pressed = false; >clearBtn.onclick = function() < ctx.fillStyle = 'rgb(0,0,0)'; ctx.fillRect(0,0,width,height); >function draw() < if(pressed) < ctx.fillStyle = colorPicker.value; ctx.beginPath(); ctx.arc(curX, curY-85, sizePicker.value, degToRad(0), degToRad(360), false); ctx.fill(); >requestAnimationFrame(draw); > draw();

Specifications

Browser compatibility

The compatibility table on this page is generated from structured data. If you’d like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Desktop						Mobile
Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
type=»button»	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support Yes	Opera Full support Yes	Safari Full support 1	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support 1.0

Legend

See also

Источник

Html input type button title

An elements’ value attribute contains a string that is used as the button’s label.

input type="button" value="Click Me" /> 

Button without a value

If you don’t specify a value , you get an empty button:

Using buttons

A simple button

We’ll begin by creating a simple button with a click event handler that starts our machine (well, it toggles the value of the button and the text content of the following paragraph):

form> input type="button" value="Start machine" /> form> p>The machine is stopped.p> 

const button = document.querySelector("input"); const paragraph = document.querySelector("p"); button.addEventListener("click", updateButton); function updateButton()  if (button.value === "Start machine")  button.value = "Stop machine"; paragraph.textContent = "The machine has started!"; > else  button.value = "Start machine"; paragraph.textContent = "The machine is stopped."; > > 

The script gets a reference to the HTMLInputElement object representing the in the DOM, saving this reference in the variable button . addEventListener() is then used to establish a function that will be run when click events occur on the button.

Adding keyboard shortcuts to buttons

Keyboard shortcuts, also known as access keys and keyboard equivalents, let the user trigger a button using a key or combination of keys on the keyboard. To add a keyboard shortcut to a button — just as you would with any for which it makes sense — you use the accesskey global attribute.

In this example, s is specified as the access key (you’ll need to press s plus the particular modifier keys for your browser/OS combination; see accesskey for a useful list of those).

form> input type="button" value="Start machine" accesskey="s" /> form> p>The machine is stopped.p> 

const button = document.querySelector("input"); const paragraph = document.querySelector("p"); button.addEventListener("click", updateButton); function updateButton()  if (button.value === "Start machine")  button.value = "Stop machine"; paragraph.textContent = "The machine has started!"; > else  button.value = "Start machine"; paragraph.textContent = "The machine is stopped."; > > 

Note: The problem with the above example of course is that the user will not know what the access key is! In a real site, you’d have to provide this information in a way that doesn’t interfere with the site design (for example by providing an easily accessible link that points to information on what the site accesskeys are).

Disabling and enabling a button

To disable a button, specify the disabled global attribute on it, like so:

input type="button" value="Disable me" disabled /> 

Setting the disabled attribute

You can enable and disable buttons at run time by setting disabled to true or false . In this example our button starts off enabled, but if you press it, it is disabled using button.disabled = true . A setTimeout() function is then used to reset the button back to its enabled state after two seconds.

input type="button" value="Enabled" /> 

const button = document.querySelector("input"); button.addEventListener("click", disableButton); function disableButton()  button.disabled = true; button.value = "Disabled"; setTimeout(() =>  button.disabled = false; button.value = "Enabled"; >, 2000); > 

Inheriting the disabled state

If the disabled attribute isn’t specified, the button inherits its disabled state from its parent element. This makes it possible to enable and disable groups of elements all at once by enclosing them in a container such as a element, and then setting disabled on the container.

The example below shows this in action. This is very similar to the previous example, except that the disabled attribute is set on the when the first button is pressed — this causes all three buttons to be disabled until the two second timeout has passed.

fieldset> legend>Button grouplegend> input type="button" value="Button 1" /> input type="button" value="Button 2" /> input type="button" value="Button 3" /> fieldset> 

const button = document.querySelector("input"); const fieldset = document.querySelector("fieldset"); button.addEventListener("click", disableButton); function disableButton()  fieldset.disabled = true; setTimeout(() =>  fieldset.disabled = false; >, 2000); > 

Note: Firefox will, unlike other browsers, by default, persist the dynamic disabled state of a across page loads. Use the autocomplete attribute to control this feature.

Validation

Buttons don’t participate in constraint validation; they have no real value to be constrained.

Examples

div class="toolbar"> input type="color" aria-label="select pen color" /> input type="range" min="2" max="50" value="30" aria-label="select pen size" />span class="output">30span> input type="button" value="Clear canvas" /> div> canvas class="myCanvas"> p>Add suitable fallback here.p> canvas> 

body  background: #ccc; margin: 0; overflow: hidden; > .toolbar  background: #ccc; width: 150px; height: 75px; padding: 5px; > input[type="color"], input[type="button"]  width: 90%; margin: 0 auto; display: block; > input[type="range"]  width: 70%; > span  position: relative; bottom: 5px; > 

const canvas = document.querySelector(".myCanvas"); const width = (canvas.width = window.innerWidth); const height = (canvas.height = window.innerHeight - 85); const ctx = canvas.getContext("2d"); ctx.fillStyle = "rgb(0,0,0)"; ctx.fillRect(0, 0, width, height); const colorPicker = document.querySelector('input[type="color"]'); const sizePicker = document.querySelector('input[type="range"]'); const output = document.querySelector(".output"); const clearBtn = document.querySelector('input[type="button"]'); // covert degrees to radians function degToRad(degrees)  return (degrees * Math.PI) / 180; > // update sizepicker output value sizePicker.oninput = () =>  output.textContent = sizePicker.value; >; // store mouse pointer coordinates, and whether the button is pressed let curX; let curY; let pressed = false; // update mouse pointer coordinates document.onmousemove = (e) =>  curX = e.pageX; curY = e.pageY; >; canvas.onmousedown = () =>  pressed = true; >; canvas.onmouseup = () =>  pressed = false; >; clearBtn.onclick = () =>  ctx.fillStyle = "rgb(0,0,0)"; ctx.fillRect(0, 0, width, height); >; function draw()  if (pressed)  ctx.fillStyle = colorPicker.value; ctx.beginPath(); ctx.arc( curX, curY - 85, sizePicker.value, degToRad(0), degToRad(360), false, ); ctx.fill(); > requestAnimationFrame(draw); > draw(); 

Technical summary

Specifications

Источник