This can be especially important if the page design doesn't offer descriptive labels for each By default, the up and down buttons provided for you to step the number up and down will step the value up and down by 1.

W3Schools is optimized for learning, testing, and training. If the This value must be less than or equal to the value of the A Boolean attribute which, if present, means this field cannot be edited by the user. If you haven’t already created an account, you will be prompted to do so after signing in. If you input the number 1 and click the up arrow, it will increase to 2. You can change this by providing a In this example, you should find that the up and down step arrows will increase and decrease the value by 10 each time, not 1. If the This value must be greater than or equal to the value of the The minimum value to accept for this input. If you try to enter a number with a decimal (such as "1.0"), it will be considered invalid. You can set a default value for the input by including a number inside the In addition to the attributes commonly supported by all The maximum value to accept for this input. Any floating-point number, or empty. The step attribute specifies the interval between legal numbers in an element. This looks very similar to the validation styling we saw before; nothing remarkable here.After declaring a few variables, an event listener is added to the (Note that we're not converting back and forth between meters and feet/inches here, which a real-life web application would probably do. If you'd like to contribute to the data, please check out The “step” attribute is less intuitive: by playing with different values, you would most likely work out that it controls the increase/decrease when clicking the up/down buttons on the field. The following screenshot is taken from Firefox for Android:In its most basic form, a number input can be implemented like this:A number input is considered valid when empty and when a single number is entered, but is otherwise invalid. Tip: The step attribute can be used together with the max and min attributes to create a range of legal values. An HTML form with an input field with a specified legal number intervals:The step attribute specifies the interval between legal numbers in an element.Example: if step="3", legal numbers could be -3, 0, 3, 6, etc.The numbers in the table specify the first browser version that fully supports the attribute.If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: The defines a field for entering a number. step 属性规定输入字段的合法数字间隔（假如 step="3"，则合法数字应该是 -3、0、3、6，以此类推）。 提示： step 属性可以与 max 以及 min 属性配合使用，以创建合法值的范围。 注释： step、max 以及 min 属性适用于以下 类型：number, range, date, datetime, datetime-local, month, time … allowInvalid.If a non-number is entered in the input, the browser will report the value as an empty string, which means the view / model values in ngModel and subsequently the scope value will also be an empty string. If you want to enter a value that requires decimals, you'll need to reflect this in the For example, to adjust the width of the input to be only as wide as is needed to enter a three-digit number, we can change our HTML to include an Then we add some CSS to narrow the width of the element with the You can provide a list of default options from which the user can select by specifying the We have already mentioned a number of validation features of The following example exhibits all of the above features, as well as using some CSS to display valid and invalid icons, depending on the Try submitting the form with different invalid values entered — e.g., no value; a value below 0 or above 100; a value that is not a multiple of 10; or a non-numerical value — and see how the error messages the browser gives you differ with different ones.It's far too easy for someone to make adjustments to the HTML that allow them to bypass the validation, or to remove it entirely.

It's also possible for someone to bypass your HTML and submit the data directly to your server.If your server-side code fails to validate the data it receives, disaster could strike when improperly-formatted data is submitted (or data which is too large, is of the wrong type, and so forth).The rationale for this is that number inputs won't be valid if they contain anything except numbers, and you can constrain the minimum and maximum number of valid digits using the We've already covered the fact that by default, the increment is In the following example is a form for entering the user's height. You can still manually enter a number outside these bounds, but it will be considered invalid.One issue with number inputs is that their step size is 1 by default. Examples might be simplified to improve reading and basic understanding. This is because the default step is 1… jrandi. Sign in to enjoy the benefits of an MDN account. value - Specifies the default value. The number input type provides a nice way for to deal with numbers. Since we want to accept a meter value in centimeters, we've set the We've hidden the feet and inches inputs initially using Now, onto the CSS. Tip: Always add the tag for best accessibility practices! You can still manually enter a number that's not a multiple of 10, but it will be considered invalid.In this updated version, you should find that the up and down step buttons will not allow you to go below 0 or above 100. The input for the height in meters accepts decimals to two places.You'll see that we are using many of the attributes we've already looked at in the article earlier on.

)If you didn't do this, you'd have to fill in both feet/inches Get the latest and greatest from MDN delivered straight to your inbox.The newsletter is offered in English only at the moment. Example: if step="3", legal numbers could be -3, 0, 3, 6, etc. In browsers that follow the HTML5 specification, input [number] does not work as expected with ngModelOptions.

「min="1"」にすると、またちょっと変わった動きになります。 例えば、入力欄に「12」が入力されている状態で ボタンを押すと、「12」→「14」→「16」とは増えず、まず「13」になり「15」と増えていきます。 You can set a default value for the input by including a number inside the value attribute, like so: Beiträge gesamt: 794. step - specifies the legal number intervals. But what if we want […] You can set bounds with the min and max attributes and users can press up and down to go add or remove 1, or if you add the step attribute, go up or down by a step. HTML5 constraint validation and allowInvalid. A Number representing the value of the number entered into the input. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. If you'd like to contribute to the interactive examples project, please clone The compatibility table on this page is generated from structured data. Its Mobile browsers further help with the user experience by showing a special keyboard more suited for entering numbers when the user tries to enter a value. The source for this interactive example is stored in a GitHub repository. 定义和用法. min - specifies the minimum value allowed.