Thursday, October 22, 2020

New Drag and Drop ListView @pnp/spfx-controls-react

This post is about a feature that i was expecting some and was launch in @pnp/spfx-controls-react in version V2.1.0, that was the capability to use drag and drop of files in ListView and capture the file object to make the associated actions afterwards.

The following example explain how we can use the ListView Control to use drag and drop option and  retrieve the file object from the new handler onDrop event and copy to a SharePoint Document Library.

The first thing that needs to be made is to configure the ListView properties in the control with the following:

  • dragDropFiles as True, activates the drag and drop option.
  • OnDrop handler, Method this._getDropFiles retrieves files from drop handler.

The handler  OnDrop retrieves the files object that allow us to manage the content as we want.
This can be upload files to a libraries, validate what type of file, size of file, naming with capability or renaming, in the end multiple business requirements that can be stop or validated before file is included in the system.   


When you test the control using "gulp serve" base in a existing Document Library you can see the normal list of documents as working in the older version. 



To activate the drag and drop pick some files and drag to ListView area and upload information focus will appear, in this moment you can leave the files and the upload process can start.  


After you drop the files in the List View area the handler drop sends objects to method _getDropFiles and uploads the files to a Document Library as explain the code below.
This 

  /**
  * Method that retrieves files from drag and drop
  * @param files
  */
 private _getDropFiles = (files) =>{
  let count=0; 
  for (var i = 0; i < files.length; i++) {
    var file = files[i];
    if (file != undefined || file != null) {
      let spOpts : ISPHttpClientOptions = {
        headers: {
          "Accept": "application/json",
          "Content-Type": "application/json"
        },
        body: file        
      };

      var url = `${this.props.context.pageContext.web.absoluteUrl}/_api/Web/GetFolderByServerRelativeUrl('Shared%20Documents')/Files/Add(url='${file.name}', overwrite=true)`;

      this.props.context.spHttpClient.post(url, SPHttpClient.configurations.v1, spOpts).then((response: SPHttpClientResponse) => {

        console.log(`Status code: ${response.status}`);
        console.log(`Status text: ${response.statusText}`);
        response.json().then((responseJSON: JSON) => {
          count++;
          if(count=== (files.length) ) {
            this.componentDidMount();
          }
          console.log(responseJSON);
        });
      });

    }
  }
}
The following method is a reuse function componentDidMount to make refresh of ListView to display the uploaded files that was managed in method below.
public componentDidMount() {
    const restApi = `${this.props.context.pageContext.web.absoluteUrl}/_api/web/GetFolderByServerRelativeUrl('Shared%20Documents')/files?$expand=ListItemAllFields`;
    this.props.context.spHttpClient.get(restApi, SPHttpClient.configurations.v1)
      .then(resp => { return resp.json(); })
      .then(items => {
        this.setState({
          items: items.value ? items.value : []
        });
      });
 }
After refresh the ListView should display the files as defined in the method.


Simple and in my opinion a very useful feature that was missing for some time in my point of view.
It's always interesting how the concept of open source give opportunity that everyone could contribute, like i did with this new feature ListView Drag and Drop.
If you have a good idea for a improvement and feature that you can identify a very good business case, you can always propose or bug fixing to PNP community, they are pro active and very open to improvements.

Hope you like this simple articles, 
André Lage

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