如何在 reactjs ES6 中的 JSONArray 上使用 .map() 函数

Question

I have a JSONArray returned by the server. I want to use .map() on it so that i can get key,values pairs of every object present in that array. I have written following code but i am getting error "files.map is not a function". Can anyone please help me resolve this?

showUploadedFiles()
  {
    const page = 1;
    const items_per_page = this.state.event.file_ids.length;
    getAllTaskFiles(this.state.event.id, page, items_per_page).then((allFiles) => {
      this.renderUploadedFiles(allFiles);
    });

  }

  renderUploadedFiles(files)
  {
    let details = null;
    details = files.map((singleFile) => {
    return (
      <div>
        <a href="#" >{singleFile.filename}</a> 
        <a href="#" >{singleFile.file_path}</a>
      </div>
      );
    });
  }  

My JSONArray is:

[{"file_id": 5224879255191552, "filename": "children_walk_friends_forest_116878_3840x2160.jpg", "file_path": "/api/files/encoded_gs_file%3AdHJhY2tpbmctYXBpL3YxL2FjY291bnRzLzU2Mjk0OTk1MzQyMTMxMjAvdGFza3MvNDk5NjE4MDgzNjYxNDE0NC81MjI0ODc5MjU1MTkxNTUyL2Zha2UtemRNeklhZ1RTYl9PN3RXY2pXbkhVQT09"}, {"file_id": 4943404278480896, "filename": "banner_old.jpg", "file_path": "/api/files/encoded_gs_file%3AdHJhY2tpbmctYXBpL3YxL2FjY291bnRzLzU2Mjk0OTk1MzQyMTMxMjAvdGFza3MvNDk5NjE4MDgzNjYxNDE0NC80OTQzNDA0Mjc4NDgwODk2L2Zha2UtcmJjbDBVdVFzVmZkMjRtRUV2ME1xZz09"}] 

Answer 1

As pointed out by other users, you have to use JSON.parse() to get object from your string. Here is the code snippet, storing your files in an array.

 const str = '[{"file_id": 5224879255191552, "filename": "children_walk_friends_forest_116878_3840x2160.jpg", "file_path": "/api/files/encoded_gs_file%3AdHJhY2tpbmctYXBpL3YxL2FjY291bnRzLzU2Mjk0OTk1MzQyMTMxMjAvdGFza3MvNDk5NjE4MDgzNjYxNDE0NC81MjI0ODc5MjU1MTkxNTUyL2Zha2UtemRNeklhZ1RTYl9PN3RXY2pXbkhVQT09"}, {"file_id": 4943404278480896, "filename": "banner_old.jpg", "file_path": "/api/files/encoded_gs_file%3AdHJhY2tpbmctYXBpL3YxL2FjY291bnRzLzU2Mjk0OTk1MzQyMTMxMjAvdGFza3MvNDk5NjE4MDgzNjYxNDE0NC80OTQzNDA0Mjc4NDgwODk2L2Zha2UtcmJjbDBVdVFzVmZkMjRtRUV2ME1xZz09"}]'; const files = JSON.parse(str); const details = files.map((singleFile) => { return ( `<div> <a href="#">{singleFile.filename}</a> <a href="#">{singleFile.file_path}</a> </div>` ); }); console.log(details);

 .as-console-wrapper { max-height: 100% !important; top: 0; }