Get size of a View in React Native

Question

Is it possible to get the size  width and height  of a certain view  For example  I have a view showing the progress    lt View ref  progressBar  style   backgroundColor  red  flex this state progress     gt     I need to know the actual width of the view to align other views properly  Is this possible

User · Answer

Maybe you can use measure   measureProgressBar         this refs welcome measure this logProgressBarLayout       logProgressBarLayout ox  oy  width  height  px  py      console log  ox      ox     console log  oy      oy     console log  width      width     console log  height      height     console log  px      px     console log  py      py

User · Answer

This is the only thing that worked for me   import React    Component   from  react   import     AppRegistry    StyleSheet    Text    View    Image   from  react-native    export default class Comp extends Component      find dimesions layout       const  x  y  width  height    layout      console warn x       console warn y       console warn width       console warn height         render         return          lt View onLayout   event    gt    this find dimesions event nativeEvent layout     style  styles container  gt           lt Text style  styles welcome  gt            Welcome to React Native           lt  Text gt           lt Text style  styles instructions  gt            To get started  edit index android js          lt  Text gt           lt Text style  styles instructions  gt            Double tap R on your keyboard to reload    n             Shake or press menu button for dev menu          lt  Text gt         lt  View gt                const styles   StyleSheet create     container        flex  1      justifyContent   center       alignItems   center       backgroundColor    F5FCFF          welcome        fontSize  20      textAlign   center       margin  10         instructions        textAlign   center       color    333333       marginBottom  5            AppRegistry registerComponent  Comp        gt  Comp

User · Answer

Basically if you want to set size and make it change then set it to state on layout like this   import React    Component   from  react   import   AppRegistry  StyleSheet  View   from  react-native    const styles   StyleSheet create     container        flex  1      backgroundColor   yellow          View1        flex  2      margin  10      backgroundColor   red       elevation  1         View2        position   absolute       backgroundColor   orange       zIndex  3      elevation  3         View3        flex  3      backgroundColor   green       elevation  2         Text        fontSize  25      margin  20      color   white             class Example extends Component      constructor props        super props        this state           view2LayoutProps            left  0          top  0          width  50          height  50                        onLayout event        const  x  y  height  width    event nativeEvent layout      const newHeight   this state view2LayoutProps height   1      const newLayout             height  newHeight           width  width          left  x          top  y                this setState   view2LayoutProps  newLayout            render         return          lt View style  styles container  gt           lt View style  styles View1  gt             lt Text gt  this state view2LayoutProps height  lt  Text gt           lt  View gt           lt View onLayout   event    gt  this onLayout event                  style   styles View2  this state view2LayoutProps     gt           lt View style  styles View3    gt         lt  View gt                  AppRegistry registerComponent Example     You can create many more variation of how it should be modified  by using this in another component which has Another view as wrapper and create an onResponderRelease callback  which could pass the touch event location into the state  which could be then passed to child component as property  which could override onLayout updated state  by placing   styles View2  this state view2LayoutProps  this props touchEventTopLeft   and so on

User · Answer

As of React Native 0 4 2  View components have an onLayout prop  Pass in a function that takes an event object  The event s nativeEvent contains the view s layout    lt View onLayout   event    gt      var  x  y  width  height    event nativeEvent layout       gt    The onLayout handler will also be invoked whenever the view is resized   The main caveat is that the onLayout handler is first invoked one frame after your component has mounted  so you may want to hide your UI until you have computed your layout

User · Answer

You can directly use the Dimensions module and calc your views sizes  Actually  Dimensions give to you the main window sizes   import   Dimensions   from  Dimensions    Dimensions get  window   height  Dimensions get  window   width    Hope to help you   Update  Today using native StyleSheet with Flex arranging on your views help to write clean code with elegant layout solutions in wide cases instead computing your view sizes     Although building a custom grid components  which responds to main window resize events  could produce a good solution in simple widget components

User · Answer

Here is the code to get the Dimensions of the complete view of the device   var windowSize   Dimensions get  window     Use it like this   width windowSize width heigth windowSize width 0 565

User · Answer

for me setting the Dimensions to use   is what worked for me width  100

[ios] Get size of a View in React Native

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