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# bi.grid_view
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## 可以合并单元格，指定行列可以删除看不见的元素,基类[BI.Widget](/core/widget.md)
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{% method %}
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[source](https://jsfiddle.net/fineui/fkntzLq5/)
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{% common %}
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```javascript
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BI.createWidget({
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type: "bi.grid_view",
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width: 400,
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height: 300,
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estimatedRowSize: 30,
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estimatedColumnSize: 100,
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items: [],
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scrollTop: 100,
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rowHeightGetter: function () {
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return 30;
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},
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columnWidthGetter: function () {
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return 100;
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}
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});
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```
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{% endmethod %}
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## API
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##### 基础属性
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| 参数 | 说明 | 类型 | 可选值 | 默认值
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| :------ |:------------- | :-----| :----|:----
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| items | 子组件数组 | array | — | [ ] |
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| overflowX | 是否显示横向滚动条| boolean | true,false | true |
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| overflowY | 是否显示纵向滚动条 | boolean | true,false | true |
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| overscanColumnCount| 超出可视范围区域预加载多少列 | number|— | 0 |
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| overscanRowCount| 超出可视范围区域预加载多少行 | number | — | 0 |
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| width | 行宽，必设 |number| — | — |
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| height | 列宽，必设 | number | —| — |
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| rowHeightGetter| 每格行宽 |number,function | —| function |
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| columnWidthGetter| 每格列宽 | number,function |— | function |
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| estimatedColumnSize| 预估行宽，columnWidthGetter为function时必设 |number,function |— | function |
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| estimatedRowSize | 预估列宽，rowHeightGetter为function时必设 | number,function | —| function |
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| scrollLeft | 滚动条相对于左边的偏移 | number | — | 0 |
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| scrollTop | 滚动条相对于顶部的偏移 | number | —|0 |
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## 对外方法
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| 名称 | 说明 | 回调参数
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| :------ |:------------- | :-----
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| setScrollLeft | 设置滚动条相对于左边的偏移 | scrollLeft|
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| setScrollTop | 设置滚动条相对于顶部的偏移 | scrollTop |
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| setOverflowX | 设置是否显示横向滚动条 | b |
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| setOverflowY | 设置是否显示横向滚动条 | b|
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| getScrollLeft | 获取滚动条相对于左边的偏移 | —|
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| getScrollTop | 获取滚动条相对于顶部的偏移 | — |
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| getMaxScrollLeft | 获取滚动条相对于左边的最大偏移 | — |
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| getMaxScrollTop | 获取滚动条相对于顶部的最大偏移 |—|
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| setEstimatedColumnSize | 设置列宽 |width|
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| setEstimatedRowSize | 设置行宽 | height |
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| restore | 还原列表设置 | — |
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| populate | 刷新列表 | items |
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## 事件
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| 事件 | 说明 | 回调参数
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| :------ |:------------- |:----------|
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|BI.GridView.EVENT_SCROLL| 滚动时触发的事件 | {scrollLeft: scrollLeft, scrollTop: scrollTop} |
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---
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