Question

我有一个用户输入的表单并获取该条目并查询数据库并返回到视图。我设法让一个查询工作，但在尝试处理另一个查询时，它在视图中返回一个未定义的变量错误。见下文：

路线

var allItems:[Item]
var selectedItems[Item]

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    if collectionView == allItemsCV {
        let item = allItems[IndexPath.row]
        if let itemIndex = selectedItems.index(of:item) {
            selectedItems.remove(at:itemIndex)
            selectedItemsCV.deleteItems(at: [IndexPath(item: itemIndex, section:0)])
        } else {
            selectedItems.insert(item, at: 0)
            selectedItemsCV.insertItems(at: [IndexPath(item: 0, section:0)])
        }
        allItemsCV.deselectItem(at: indexPath, animated: true)
       // cell for item at indexPath needs to render the selected/deselected 
          state correctly based on the item being in the selectedItems array

        allItemsCV.reloadItems(at: [indexPath])

    }
}

@IBAction func removeButtonPressed(_ sender: UIButton) {
//...
    if let selectedItemPaths = selectedItemCV.indexPathsForSelectedItems {
        var allItemIndexPaths = [IndexPath]()
        var tempSelectedItems = Array(selectedItems) // Need to use a temporary copy otherwise the element indexes will change
        for itemPath in selectedItemPaths {
            let removeItem = selectedItems[itemPath.item]
            if let removeIndex = tempSelectedItems.index(of: removeItem) {
                tempSelectedItems.remove(at: removeItem)
            }
            if let allItemsIndex = allItems.index(of: removeItem) {
                allItemIndexPaths.append(IndexPath(item: allItemsIndex, section: 0))
            }
        }
        selectedItems = tempSelectedItems // Selected items array without the removed items
        selectedItemsCV.deleteItems(at:selectedItemPaths)
        allItemsCV.reloadItems(at: allItemIndexPaths)  // Reload to update the selected status
    }
}

控制器

Route::get('/shopsales', 'shopsalescontroller@index');

{

class shopsalescontroller extends Controller

}

shopales view

 public function index()
{
    $storeNum = request('storeNum');


   $result = shopsales::where('StoreNumber','=',$storeNum)
        ->get();

    return view('shopsales',compact('result'));


}

我已经使用了正在运行的查询的确切代码，正在努力理解为什么不这样做。

Answer 1

试试这个

import { Component } from '@angular/core';
import Chart from 'chart.js';

@Component({
 selector: 'app-root',
 templateUrl: './app.component.html'
 })

 export class AppComponent {
   title = 'Test';
   let myChart = new Chart({});
};

中的

App\Route

这会路由以下操作：Route::resource('/shopsales','ShopSalecontroller');，index，create，store，show，edit和update

将此功能添加到shopales模型

destroy

<{1>}索引中的

：

public function scopeNumber($query, $number){
    if($number != null){
        $query->where('storeNumber','=', "$number");
    }
}

请记住在索引视图中包含字段storeNumber

的表单

Answer 2

public function index()
{
   $storeNum = request('storeNum');
   $result = shopsales::where('StoreNumber','=',$storeNum)
        ->get();
    return view('shopsales',['result'=>compact('result')]);
}

更改上面的控制器代码。还要检查$ result是否为null。

Answer 3

尝试这样的事情

public function storeCheckout(Request $request) {
$storeNum=$request->get('storeNum');
$result = shopsales::where('StoreNumber','=',$storeNum)
        ->get();

    return view('shopsales',compact('result'));

}

Answer 4

解决了，虽然很抱歉浪费你的时间，我的一些观点应该有一个大写字母，修复了清除视图缓存，现在我有查询。

Answer 5

在行动指数中将var $ result更改为$ results

在视图索引中 @foreach（$结果为$ result） @endforeach

Laravel 5.0未定义的变量结果

5 个答案: