HTMLInputElement.stepUp()

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HTMLInputElement.stepUp() method increments the value of a numeric type of <input> element by the value of the step attribute, or the default step value if the step attribute is not explicitly set. The method, when invoked, increments the 值 by ( step * n), where n 默认为 1 if not specified, and step defaults to the default value for step if not specified.

Input type	Default step value	Example step declaration
date	`1` (day)	7 day (one week) increments: `<input type="date" min="2019-12-25" step="7">`
month	`1` (month)	12 month (one year) increments: `<input type="month" min="2019-12" step="12">`
week	`1` (week)	Two week increments: `<input type="week" min="2019-W23" step="2">`
time	`60` (seconds)	900 second (15 minute) increments: `<input type="time" min="09:00" step="900">`
datetime-local	`1` (day)	Same day of the week: `<input type="datetime-local" min="019-12-25T19:30" step="7">`
number	`1`	0.1 increments `<input type="number" min="0" step="0.1" max="10">`
range	`1`	Increments by 2: `<input type="range" min="0" step="2" max="10">`

The method, when invoked, changes the form control's value by the value given in the step attribute, multiplied by the parameter, within the constraints set on the form control. The default value for the parameter, if no value is passed, is 1 . The method will not cause the value to exceed the set max value, or defy the constraints set by the step 属性。

If the value before invoking the stepUp() method is invalid—for example, if it doesn't match the constraints set by the step attribute—invoking the stepUp() method will return a value that does match the form controls constraints.

If the form control is non time, date, or numeric in nature, and therefore does not support the step attribute (see the list of supported input types in the the table above), or if the step value is set to any ， InvalidStateError exception is thrown.

句法

element.stepUp( [ stepIncrement ] );

参数

stepIncrement: 可选 stepIncrement paremeter is a numeric value. If no parameter is passed, stepIncrement 默认为 1 .

范例

Click the button in this example to increment the number input type:

HTML

<p>
  <label>Enter a number between 0 and 400 that is divisible by 5:
   <input type="number" step="5" id="theNumber" min="0" max="400">
  </label>
</p>
<p>
  <label>Enter how many values of step you would like to increment by or leave it blank:
   <input type="number" step="1" id="incrementer" min="0" max="25">
  </label>
</p>
<input type="button" value="Increment" id="theButton">

JavaScript

/* make the button call the function */
let button = document.getElementById('theButton')
button.addEventListener('click', function() {
  steponup()
})
function steponup() {
  let input = document.getElementById('theNumber')
  let val = document.getElementById('incrementer').value
  if (val) {  /* increment with a parameter */
    input.stepUp(val)
  } else {    /* or without a parameter. Try it with 0 */
    input.stepUp()
  }
}

CSS

input:invalid {
  border: red solid 3px;
}

结果

Note if you don't pass a parameter to the stepUp method, it defaults to 1 . Any other value is a multiplier of the step attribute value, which in this case is 5 . If you pass 4 作为 stepIncrement , the input will stepUp by 4 * 5 ，或 20 . If the parameter is 0 , the number will not be incremented. The stepUp will not allow the input to out of range, in this case stopping when it reaches 400 , and rounding down any floats that are passed as a parameter.

Try setting the step increment to 1.2 . What happens when you invoke the method?

Try setting the value to 4 , which is not valid. What happens when you invoke the method?

规范

规范	状态	注释
HTML 实时标准 The definition of 'stepUp()' in that specification.	实时标准
HTML 5.1 The definition of 'stepUp()' in that specification.	推荐
HTML5 The definition of 'stepUp()' in that specification.	推荐	初始定义

浏览器兼容性

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`stepUp`	Chrome Yes	Edge 12	Firefox 16 注意事项 Disabled 16 注意事项 Disabled Experimental, and without specific UI. There are still differences with the latest spec: bug 835773 . Disabled ). To change preferences in Firefox, visit about:config.	IE ?	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

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