**<spanstyle="font-size:20px;">A</span>**: Use one-dimensional array format [celldata](/guide/sheet.html#celldata), after the initialization is completed, the data converted into a two-dimensional array format is used for storage and update, and celldata is no longer used.
If you need to take out `data` as initial data, you need to execute [transToCellData(data)](/guide/api.html#transtocelldata-data-setting) to convert it to celldata data.
Among them, the celldata in `{ r, c, v }` format is converted to a two-dimensional array using [transToData(celldata)](/guide/api.html#transtodata-celldata-setting)
**<spanstyle="font-size:20px;">A</span>** : Refer to [Table data format](/guide/sheet.html#calcchain) ,just set the calcChain corresponding to the cell data.
**<spanstyle="font-size:20px;">A</span>**: [loadUrl](/guide/config.html#loadurl). Configure loadUrl, Luckysheet will request the entire table data through ajax, and updateUrl will be used as the interface address for collaborative editing in real-time saving.
Note: Initial data needs to be configured with loadUrl parameter, while for collaborative editing, the four parameters of loadUrl, updateUrl and allowUpdate can be configured to take effect.
**<spanstyle="font-size:20px;">A</span>**: Each sheet page has a unique id, which is `index`, which can be incremented by numbers or a random string. And `order` is the sorting situation of all sheets, starting from 0, can only be numbers `0,1,2...`.
**<spanstyle="font-size:20px;">A</span>**: The excel import and export library developed with Luckysheet-[Luckyexcel](https://github.com/mengshukeji/Luckyexcel) has realized the excel import function, and the export function is under development.You can refer to these 2 blog posts for excel export at this stage:
- [Development of Excel download function based on LuckySheet online form](https://www.cnblogs.com/recode-hyh/p/13168226.html)
- [Use exceljs to export luckysheet form](https://blog.csdn.net/csdn_lsy/article/details/107179708)
## **<span style="font-size:20px;">Q</span>** How does 'Luckysheet' save the data from the table to the database? Is there a soulution for storage and collaboration?
**<spanstyle="font-size:20px;">A</span>** :There are two options：
- 1. after the table operation is completed, you can use `luckysheet.getAllSheets()` to get all sheet data that stroed in the back-end.
- 2. enable the collaborative editing function to transmit data to the back-end in real-time.
## **<span style="font-size:20px;">Q</span>** Does the project use jQuery?
**<spanstyle="font-size:20px;">A</span>** ：yes. At the beginning, Luckysheet uses jQuery。The packaging tool will package the jQuery to this file `./plugins/js/plugin.js`
If your project (such as react / Vue) also references jQuery globally and causes conflicts, you can try to remove a jQuery.
if you want to remove jQuery in `Luckysheet`, you can find `jQuery` in source code folder `gulpfile.js`：[src/plugins/js/jquery.min.js](https://github.com/mengshukeji/Luckysheet/blob/master/gulpfile.js)，then delete information related to jQuery.
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## **<span style="font-size:20px;">Q</span>** How to add a field to a cell object?
**<spanstyle="font-size:20px;">A</span>** reference [cell object format](/guide/cell.html)，then read this annotation[src/controllers/postil.js](https://github.com/mengshukeji/Luckysheet/blob/master/src/controllers/postil.js)。the annotation is a configuration in a cell object.
## **<span style="font-size:20px;">Q</span>** The toolbar icon is on the loading stage all the time.
**<spanstyle="font-size:20px;">A</span>** The luckysheet use iconfont icon in this project, if any icon cannot be loaded ,plz check your iconfont.css. we are so sorry that we did not describe it clearly in the old version documents.
## **<span style="font-size:20px;">Q</span>** Can't run Luckyexcel after package.
**<spanstyle="font-size:20px;">A</span>** Terminal does not show `end`, but if the `dist` folder has this file `luckyexcel.js`, it is normal.
Lucky excel is an excel import and export library. The project uses `gulp` as a packaging tool. There is a problem with the old version of the packaging tool, but it is fixed now. if this problem still troubles you, plz check the following steps：
1. pull the latest code.
2.`npm i`
3.`npm run build`
more information：[Luckyexcel](https://github.com/mengshukeji/Luckyexcel/)
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## **<span style="font-size:20px;">Q</span>** How to disable editing of cells？How to open sheet protection?
**<spanstyle="font-size:20px;">A</span>** Sheet protection includes disable editing of cells that you need to make some configurations on each sheets. `config.authority`, the latest configurations[sheet protection](/guide/sheet.html#config-authority)。
In order to make it easier for you to understand the function of sheet protection, the following video shows how to make the whole sheet uneditable, but allow a column of cells to be edited:
**<spanstyle="font-size:20px;">A</span>** there is the configuration of data validation，[data validation](/guide/sheet.html#dataVerification)。Also there is the API that you can use `data validation` in any time. [setDataVerification](/guide/api.html#setdataverification-optionitem-setting).
## **<span style="font-size:20px;">Q</span>** Is there a case for using Luckysheet with CDN?
**<spanstyle="font-size:20px;">A</span>** Luckysheet supports CDN. reference：[The case of using luckysheet by CDN](https://www.cnblogs.com/DuShuSir/p/13859103.html)
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## **<span style="font-size:20px;">Q</span>** how to limit the adaptive height of a picture in a cell？
**<spanstyle="font-size:20px;">A</span>** First of all, you need to move the picture and adjust the cell size, and then there are the following situations:
- if the cell contains a picture and you expand the cell, the picure will not be expanded.
- if the cell contains a picture and you shorten the cell to the edge of the picture, the picture will shrink.
- When the picture exceeds the border of the cell, the size of this picture will change with the size of the cell.
if you want to get the position of the picture, you can overlap the picture with the border of the cell.(in the source code, it needs to overlap more than 2px.)The following demo video shows how to limit the image to the adaptive width and height of the cell.
## **<span style="font-size:20px;">Q</span>** How to get the default row height and column width of the worksheet?
**<spanstyle="font-size:20px;">A</span>** There are two ways to get it
- 1. use `luckysheet.getLuckysheetfile()` to get all configuration data, so you can get the `defaultRowHeight` and `defaultColWidth` in the sheet configuration data。
- 2. use API to get the default row height [getDefaultRowHeight](/guide/api.html#getdefaultrowheight-setting) and column width.[getDefaultColWidth](/guide/api.html#getdefaultcolwidth-setting)
## **<span style="font-size:20px;">Q</span>** Why is the official new feature ineffective?
**<spanstyle="font-size:20px;">A</span>** The first step is to check whether you have used CDN to import,
The CDN link used in the Luckysheet tutorial is the service provided by [jsdelivr](https://www.jsdelivr.com/package/npm/luckysheet), and the code is from [npmjs.com](https://www.npmjs.com/) automatically sync the past, not from [Github](https://github.com/mengshukeji/Luckysheet/). Because our newly submitted code still needs to be tested for a period of time, it will not be released to npm immediately, causing the npm code to lag behind Github.
If you need to try the latest code, we strongly recommend that you pull the code from the [Luckysheet Github](https://github.com/mengshukeji/Luckysheet/) main repository. After our version is stable, we will consider releasing the npm package in real time.
The second step, if it is to import the packaged code of the github repository, test to determine whether there is a bug, you can find the problem and try to fix it, and then [submit a PR](https://github.com/mengshukeji/Luckysheet/pulls), if can't fix it, please [submit issues](https://github.com/mengshukeji/Luckysheet/issues).
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## **<span style="font-size:20px;">Q</span>** `npm run dev` reported an error: ʻError: Cannot find module'rollup'`?
**<spanstyle="font-size:20px;">A</span>** It may be a problem with the npm package installation, try the following steps:
1.`npm cache clean --force`
2.`npm i rimraf -g`
3.`rimraf node_modules`
4. Delete the package-lock.json file
5.`npm i`
6.`npm run dev`
Tip: Most other npm installation problems can also be solved by trying above steps.
## **<span style="font-size:20px;">Q</span>**How to carry out secondary development of Luckysheet in Vue project?
**<spanstyle="font-size:20px;">A</span>** The [luckysheet-vue](https://github.com/mengshukeji/luckysheet-vue) case is to provide an application integration solution.
If directly developed locally:
1. Start both the Luckysheet project and your own Vue project. For example, the Luckysheet project is at http://localhost:3001
2. Import Luckysheet to use in the Vue project through `http://localhost:3001`
In this case, after Luckysheet is modified in real time, the changes can be seen in the Vue project
