In-depth analysis and solutions to the fixed column failure problem of Ng-Zorro Table

When using Ng-Zorro Ant Design Table, the fixed column feature may not take effect even if the nzLeft or nzRight properties are configured correctly. This article delves into this common problem and reveals its root cause - a seemingly innocuous CSS rule. ant-table-measure-now { display: none; }. This rule will interfere with Ng-Zorro's internal layout measurement mechanism, causing fixed column rendering exceptions. The article provides detailed solutions and debugging suggestions to help developers avoid such conflicts.

Ng-Zorro Table fixed column failure phenomenon

Ng-Zorro Ant Design Table provides powerful data presentation capabilities, including column fixation through the nzLeft and nzRight properties, which is particularly useful when dealing with wide tables. However, developers sometimes encounter a confusing problem: even if [nzScroll]="{ x: '...', y: '...' }" is set on nz-table and the nzLeft or nzRight attribute is added on

or , the desired fixed column effect is not achieved, and these columns will still move as the table scrolls.

For example, here is a typical Ng-Zorro Table configuration where an attempt is made to fix the first two columns and the last column:

 <nz-table x: y:>
  <thead>
    <tr>
      <th nzwidth="200px" nzleft>Full Name</th>
      <th nzleft>Age</th>
      <th>Column 1</th>
      <!-- ...other columns... -->
      <th nzright>Action</th>
    </tr>
  </thead>
  <tbody>
    <tr data of fixedtable.data>
      <td nzleft>{{ data.name }}</td>
      <td nzleft>{{ data.age }}</td>
      <td>{{ data.address }}</td>
      <!-- ...other columns... -->
      <td nzright>
        <a>action</a>
      </td>
    </tr>
  </tbody>
</nz-table>

In this configuration, if fixed columns don't work as expected, the first suspicion would usually be Angular or Ng-Zorro version compatibility, component import issues, or misconfiguration of the nzScroll property. However, in many cases, the problem is not with these common factors.

Source of the problem: CSS style conflict

After in-depth investigation, it was found that the root cause of such fixed column failure problems is often a specific CSS rule conflict. Ng-Zorro Table uses some hidden helper elements internally to accurately calculate column widths and layout, especially when fixed columns and scrolling are involved. One of the key auxiliary elements is .ant-table-measure-now.

If the following CSS rules exist in the project:

 .ant-table-measure-now {
  display: none;
}

This rule will force hiding of the internal elements used by the Ng-Zorro Table for measurement layout. When these measurement elements are hidden by display: none;, the table will not be able to correctly obtain the column size information, causing the fixed column positioning and rendering mechanism to fail. Although this CSS rule may have been added in other scenarios to hide certain unnecessary elements, it had an unexpected and disruptive effect on the inner workings of the Ng-Zorro Table.

solution

The solution to this problem is very straightforward: remove or comment out the conflicting CSS rules.

Check your global CSS files (such as styles.css or index.scss), component-specific CSS files, or any areas where external styles may be introduced, and look for the .ant-table-measure-now { display: none; } rule. Once found, delete or comment it out.

Example:

If you find code similar to the following in your project:

 /* May exist in your global style file or a component style file */
.some-custom-class {
  /* ... */
}

/* Error example: Be sure to remove or comment out this rule*/
.ant-table-measure-now {
  display: none; /* Remove or comment out this line*/
}

.another-style {
  /* ... */
}

Modify it to:

 /* Correct approach: Ensure that the display attribute of Ng-Zorro’s internal measurement element is not overridden*/
/* .ant-table-measure-now {
  display: none;
} */

After modifying and saving the CSS file, recompile and run your Angular application, and the fixed column function of Ng-Zorro Table should return to normal.

Precautions and debugging suggestions

1. Global CSS review: Check global style files first, as they are most likely to inadvertently affect internal elements of third-party UI libraries.
2. Browser developer tools:
   • Use the developer tools of Chrome/Firefox and other browsers to check the Ng-Zorro Table structure.
   • Locate the div.ant-table-wrapper, div.ant-table-container and other elements inside the table.
   • Pay special attention to whether there are elements with the ant-table-measure prefix such as div.ant-table-measure-row or div.ant-table-measure-now.
   • Check the Computed styles of these elements to see if the display property is set to none and which CSS rule causes this setting. This will point directly to the problem.
3. Style isolation: In Angular projects, it is recommended to use the component's style isolation mechanism (such as encapsulation: ViewEncapsulation.Emulated, which is the default behavior) to reduce the impact of component internal styles on the global world. But for global CSS rules that directly modify elements inside third-party libraries, style isolation may not completely prevent their effect. Therefore, you need to be careful when using global styles.
4. Avoid overriding UI library internal styles at will: UI libraries (such as Ng-Zorro) usually have their own internal layout and rendering logic, which rely on specific DOM structures and default styles. Overriding these internal styles at will, especially key attributes such as display, visibility, position, etc., may cause unexpected problems. When modifying the UI library style, you should give priority to using the API provided by it or the officially recommended customization method.

Summarize

Ng-Zorro Ant Design Table fixed column failure problem, although the function is not working, the underlying reason is often a seemingly irrelevant CSS rule. ant-table-measure-now { display: none; } interferes with the internal measurement mechanism of the library. The problem can be resolved quickly by carefully reviewing and removing or commenting out this conflicting CSS rule. This reminds us that when using third-party UI libraries, we should be wary of potential conflicts that may be caused by global CSS styles, and make good use of browser developer tools for debugging to accurately identify and solve style problems.

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