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書名： Ext JS 3.0 Cookbook
作者名： Jorge Ramon
本章字數： 146字
更新時間： 2021-04-01 13:43:45

Effortless range checking for numbers

Now, you'll see how to use Ext JS in order to guarantee that a number falls within a certain range.

How to do it...

The following steps illustrate how to perform range checking on numeric values:

Create your sample numbers:
```
var number1 = 30;
var number2 = 75;
```

Check whether your numbers are within a range:

var constrained = number1.constrain(25, 50);
// constrained is 30 because number1 is
// within the specified range
constrained = number2.constrain(25, 50);
// constrained is 50 because number2 is
// greater than the max. value in the range

How it works...

Ext.Number is a one-function extension of the JavaScript Number object. The only function of Ext.Number is constrain(min, max), which simply uses methods of the Math JavaScript object to accomplish the range checks on the given number.

constrain: function(min, max) {
return Math.min(Math.max(this, min), max);
}

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Ext JS 3.0 Cookbook

Effortless range checking for numbers

How to do it...

How it works...