The content of this chapter collects the common problems that everyone has feedback. If the official documents and this list can’t answer your questions, I recommend you to [Official Forum](https://github.com/mengshukeji/Luckysheet/discussions)
## What is the difference between data and celldata in luckysheetfile?
**<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)
**<spanstyle="font-size:20px;">A</span>**: We have collected the secondary development requirements for cell events, and planned the cell-related hook functions, refer to [cell hook function](/guide/config.html#cellrenderafter) (the TODO displayed is not yet open)
**<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 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.
**<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.
**<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.
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:
**<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).
**<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)
**<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.
- 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)
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).
**<spanstyle="font-size:20px;">A</span>**: The [luckysheet-vue](https://github.com/mengshukeji/luckysheet-vue) case is to provide an application integration solution.
**<spanstyle="font-size:20px;">A</span>**: You need to introduce a chart plugin to use it. You should configure the chart plugin to use when the workbook is initialized. Refer to
**<spanstyle="font-size:20px;">A</span>**: The custom attributes directly assigned to the cell object will be filtered. To make the custom attributes take effect, you need to edit the code to remove the filter attributes.
## How to enter text starting with `'='`? For example, `=currentDate('YYYY-MM-DD')`, it will remove the function by default, how to prohibit the function?
**<spanstyle="font-size:20px;">A</span>**: Just add a single quotation mark in front of it, and it will be forcibly recognized as a string, which is consistent with excel. For example: `'=currentDate('YYYY-MM-DD')`
**<spanstyle="font-size:20px;">A</span>**: The API method `luckysheet.create()` does not have a callback, but Luckysheet provides a hook function to execute the callback method at a specified location, such as:
**<spanstyle="font-size:20px;">A</span>**: When the cell is selected, it is highlighted by default, just remove the highlight, use API: [setRangeShow](/guide/api.html#setrangeshow-range-setting)
**<spanstyle="font-size:20px;">A</span>**: In the source code [src/controllers/hander.js](https://github.com/mengshukeji/Luckysheet/blob/master/src/controllers/handler.js), search for `event.which == "3"` to find the code executed by the right-click event.
**<spanstyle="font-size:20px;">A</span>**: No configuration is currently provided, you can refer to the implementation of the print button in the toolbar to modify the source code:
1. Search for `luckysheet-icon-print` globally to find the implementation of the print button, in [src/controllers/constant.js](https://github.com/mengshukeji/Luckysheet/blob/master/src/controllers/constant.js) add a similar template string, you need to customize a unique id
2. Modify [src/controllers/resize.js](https://github.com/mengshukeji/Luckysheet/blob/master/src/controllers/resize.js) and add a new record in the toobarConfig object
3. Modify [src/controllers/menuButton.js](https://github.com/mengshukeji/Luckysheet/blob/master/src/controllers/menuButton.js) to add an event listener
**<spanstyle="font-size:20px;">A</span>**: Two source codes need to be modified:
1. Add a formula to the `functionImplementation` object in the [src/function/functionImplementation.js](https://github.com/mengshukeji/Luckysheet/blob/master/src/function/functionImplementation.js) file, format refer to formulas such as `SUM`/`AVERAGE`
2. Modify all the language packs in the [src/locale](https://github.com/mengshukeji/Luckysheet/blob/master/src/locale) file directory, and add the new formula description to the `functionlist` array in. Among them, `t` is the category of the function, `m` is the number of parameters, the minimum number of parameters and the maximum number of parameters.
------------
## Is there a similar loadData interface, I want to load 10 records first, and then dynamically load the data, these data are appended to the table?
**<spanstyle="font-size:20px;">A</span>**: Yes. Our `loadSheetUrl` provides this function, which can be turned on by initializing `options.enablePage = true`.
Searching for `enablePage` in the source code, you can see that there is a `method.addDataAjax` method, which contains an ajax request to dynamically load data, which will be appended to the worksheet.
This function is now hidden in the document, because when we made this interface, the interface parameters were matched according to our actual business, which may not be universal. We are going to abstract and release it for everyone to use. If you want to use it yourself you can change it based on this.
It is recommended that you consider writing your own interface to load the data, and then use `setRangeValue` to append the data at the specified location, which has a higher degree of customization.
