element. 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. You can set a default value for the input by including a number inside the value attribute, like so: 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. 「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。 定义和用法. 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. It defaults to accepting a height in meters, but you can click the relevant button to change the form to accept feet and inches instead. 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 haven’t already created an account, you will be prompted to do so after signing in. 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. Beiträge gesamt: 794. 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. The defines a field for entering a number. Tip: The step attribute can be used together with the max and min attributes to create a range of legal values. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. 5. Definition and Usage.
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. If you input the number 1 and click the up arrow, it will increase to 2. 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. Any floating-point number, or empty. Use the following attributes to specify restrictions: max - specifies the maximum value allowed. input type number step=0 . Examples might be simplified to improve reading and basic understanding. 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. value - Specifies the default value. jrandi. The source for this interactive example is stored in a GitHub repository. 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. The number input type provides a nice way for to deal with numbers. W3Schools is optimized for learning, testing, and training. If the Sometimes it's helpful to offer an in-context hint as to what form the input data should take.
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 …
A Number representing the value of the number entered into the input. In browsers that follow the HTML5 specification, input [number] does not work as expected with ngModelOptions.
But what if we want […] step - specifies the legal number intervals. 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. If you try to enter a number with a decimal (such as "1.0"), it will be considered invalid. If the This value must be greater than or equal to the value of the The minimum value to accept for this input. 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 interactive examples project, please clone The compatibility table on this page is generated from structured data. 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. Tip: Always add the