在ExtJS 4 GridPanel列中使用Ext.create渲染动态组件。

I've got an ExtJS (4.0.7) GridPanel that I'm populating from a store. The values that I display in the GridPanel's column need to have a different view depending on the type of data that's in the record.

我有一个ExtJS (4.0.7) GridPanel，我正在从一个商店中填充它。我在GridPanel的列中显示的值需要根据记录中的数据类型有不同的视图。

The ultimate goal is that records with "double" or "integer" value for the record's type property present a slider to the user that they can adjust, and a type of "string" just renders some read-only text.

最终的目标是，记录的类型属性的“double”或“integer”值的记录会向用户显示一个滑动条，它们可以进行调整，而一种“字符串”只是呈现一些只读文本。

I've created a custom Column to do this. It inspects the type in the renderer and determines what to render.

我创建了一个自定义列来执行这个操作。它检查渲染器中的类型并确定要呈现什么。

I've got the "string" working fine with the code below, but struggling with how I can dynamically create and render the more complicated slider control in the column.

我已经得到了下面的代码的“string”工作，但是我还在为如何动态创建和呈现列中更复杂的slider控件而挣扎。

This simplified example is just trying to render a Panel with a date control in it as if I can get that going, I can figure out the rest of the slider stuff.

这个简化的例子就是试图用一个日期控件来呈现一个面板，就好像我可以让它运行一样，我可以计算出其他的滑块。

Ext.define('MyApp.view.MyColumn', {
    extend: 'Ext.grid.column.Column',
    alias: ['widget.mycolumn'],

    stringTemplate: new Ext.XTemplate('code to render {name} for string items'),

    constructor: function(cfg){
        var me = this;
        me.callParent(arguments);

        me.renderer = function(value, p, record) {
            var data = Ext.apply({}, record.data, record.getAssociatedData());

            if (data.type == "string") {
                return me.renderStringFilter(data);
            } else if (data.type == "double" || data.type == "integer") {
                return me.renderNumericFilter(data);
            } else {
                log("Unknown data.type", data);

        };
    },

    renderStringFilter: function(data) {
        // this works great and does what I want
        return this.stringTemplate.apply(data);
    },

    renderNumericFilter: function(data) {

        // ***** How do I get a component I "create" to render 
        // ***** in it's appropriate position in the gridpanel?
        // what I really want here is a slider with full behavior
        // this is a placeholder for just trying to "create" something to render

        var filterPanel = Ext.create('Ext.panel.Panel', {
            title: 'Filters',
            items: [{
                xtype: 'datefield',
                fieldLabel: 'date'
            }],
            renderTo: Ext.getBody() // this doesn't work
        });
        return filterPanel.html;  // this doesn't work
    }
});

My problem really is, how can I Ext.create a component, and have it render into a column in the gridpanel?

我的问题是，如何创建一个组件，并将其呈现在gridpanel中的一个列中?

3 个解决方案

#1

There are a few ways that I have seen this accomplished. Since the grid column is not an Ext container it can not have Ext components as children as part of any configuration the way other container components can. Post grid-rendering logic is required to add Ext components to cells.

有一些方法我已经看到完成了。由于网格列不是一个Ext容器，所以它不能像其他容器组件那样，将Ext组件作为任何配置的一部分。Post网格呈现逻辑需要将Ext组件添加到单元格中。

This solution modifies your custom column render so that it puts a special css class on the rendered TD tag. After the grid view is ready, the records are traversed and the custom class is found for appropriate special columns. A slider is rendered to each column found.

这个解决方案修改了您的自定义列，使它在呈现的TD标记上放置一个特殊的css类。在网格视图准备好之后，将遍历记录，并为适当的特殊列找到自定义类。每个列都显示一个滑块。

The code below is a modified version of the ext js array grid example provided in the Sencha examples. The modification mixes in the custom column renderer and the post grid rendering of sliders to TD elements.

下面的代码是在Sencha示例中提供的ext js数组网格示例的修改版本。在自定义列渲染器中进行了修改，并将滑块的后网格呈现给了TD元素。

This example only includes enough modification of the Sencha example to show the implementation ideas. It lacks separated view and controller logic.

本例仅包含Sencha示例的足够修改，以显示实现思想。它缺乏分离的视图和控制器逻辑。

This is modified from here

这是从这里修改的。

 Ext.require([
     'Ext.grid.*',
     'Ext.data.*',
     'Ext.util.*',
     'Ext.data.Model'
 ]);


 Ext.onReady(function() {

     // sample static data for the store
     Ext.define('Company', {
         extend: 'Ext.data.Model',
         fields: ['name', 'price', 'change', 'pctChange', 'lastUpdated', 'type']
     });

     var myData = [
         ['3m Co', 71.72, 2, 0.03, '9/1/2011', 'integer'],
         ['Alcoa Inc', 29.01, 4, 1.47, '9/1/2011', 'string'],
         ['Altria Group Inc', 83.81, 6, 0.34, '9/1/2011', 'string'],
         ['American Express Company', 52.55, 8, 0.02, '9/1/2011', 'string'],
         ['American International Group, Inc.', 64.13, 2, 0.49, '9/1/2011', 'integer'],
         ['AT&T Inc.', 31.61, 4, -1.54, '9/1/2011', 'integer'],
         ['Boeing Co.', 75.43, 6, 0.71, '9/1/2011', 'string'],
         ['Caterpillar Inc.', 67.27, 8, 1.39, '9/1/2011', 'integer'],
         ['Citigroup, Inc.', 49.37, 1, 0.04, '9/1/2011', 'integer'],
         ['E.I. du Pont de Nemours and Company', 40.48, 3, 1.28, '9/1/2011', 'integer'],
         ['Exxon Mobil Corp', 68.1, 0, -0.64, '9/1/2011', 'integer'],
         ['General Electric Company', 34.14, 7, -0.23, '9/1/2011', 'integer']
     ];

     // create the data store
     var store = Ext.create('Ext.data.ArrayStore', {
         model: 'Company',
         data: myData
     });

     // existing template
     stringTemplate = new Ext.XTemplate('code to render {name} for string items');

     // custom column renderer
     specialRender = function(value, metadata, record) {
         var data;

         data = Ext.apply({}, record.data, record.getAssociatedData());

         if (data.type == "string") {
             return stringTemplate.apply(data);;
         } else if (data.type == "double" || data.type == "integer") {
             // add a css selector to the td html class attribute we can use it after grid is ready to render the slider
             metadata.tdCls = metadata.tdCls + 'slider-target';
             return '';
         } else {
             return ("Unknown data.type");

         }
     };

     // create the Grid
     grid = Ext.create('Ext.grid.Panel', {
         rowsWithSliders: {},
         store: store,
         stateful: true,
         stateId: 'stateGrid',
         columns: [{
             text: 'Company',
             flex: 1,
             sortable: false,
             dataIndex: 'name'
         }, {
             text: 'Price',
             width: 75,
             sortable: true,
             renderer: 'usMoney',
             dataIndex: 'price'
         }, {
             text: 'Change',
             width: 75,
             sortable: true,
             dataIndex: 'change',
             renderer: specialRender,
             width: 200
         }, {
             text: '% Change',
             width: 75,
             sortable: true,
             dataIndex: 'pctChange'
         }, {
             text: 'Last Updated',
             width: 85,
             sortable: true,
             renderer: Ext.util.Format.dateRenderer('m/d/Y'),
             dataIndex: 'lastUpdated'
         }],
         height: 350,
         width: 600,
         title: 'Irm Grid Example',
         renderTo: 'grid-example',
         viewConfig: {
             stripeRows: true
         }
     });

     /**
      * when the grid view is ready this method will find slider columns and render the slider to them
      */
     onGridViewReady = function() {
         var recordIdx,
             colVal,
             colEl;

         for (recordIdx = 0; recordIdx < grid.store.getCount(); recordIdx++) {
             record = grid.store.getAt(recordIdx);
             sliderHolder = Ext.DomQuery.select('.slider-target', grid.view.getNode(recordIdx));
             if (sliderHolder.length) {
                 colEl = sliderHolder[0];

                 // remove div generated by grid template - alternative is to use a new template in the col
                 colEl.innerHTML = '';

                 // get the value to be used in the slider from the record and column
                 colVal = record.get('change');

                 // render the slider - pass in the full record in case record data may be needed by change handlers
                 renderNumericFilter(colEl, colVal, record)
             }
         }

     }

     // when the grids view is ready, render sliders to it
     grid.on('viewready', onGridViewReady, this);

     // modification of existing method but removed from custom column 
     renderNumericFilter = function(el, val, record) {

         var filterPanel = Ext.widget('slider', {
             width: 200,
             value: val,
             record: record,
             minValue: 0,
             maxValue: 10,
             renderTo: el
         });

     }
 });

#2

I did something like this when I needed to render a small chart (essentially a spark chart) in a grid column. This solution is similar to sha's, but it's more robust and delegates the rendering to the component being rendered rather than the Column, which doesn't really have a render chain.

当我需要在网格列中呈现一个小图表(本质上是一个星图)时，我就这样做了。这个解决方案类似于sha，但是它更健壮，并且将呈现给呈现给组件而不是列，而不是真正的呈现链。

First, the column class:

首先,列类:

Ext.define("MyApp.view.Column", {
    extend: "Ext.grid.column.Column",

    // ...

    renderer: function (value, p, record) {
        var container_id = Ext.id(),
            container = '<div id="' + container_id + '"></div>';

        Ext.create("MyApp.view.Chart", {
            type: "column",
            // ...
            delayedRenderTo: container_id
        });

        return container;
    }
});

Note the delayedRenderTo config option. Just like renderTo, this will be the DOM ID of the element that the chart component will render to, except that it doesn't need to be present in the DOM at the time of creation.

请注意delayedRenderTo配置选项。就像renderTo一样，这将是图表组件将呈现的元素的DOM ID，只是在创建时不需要出现在DOM中。

Then the component class:

然后组件类:

Ext.define("MyApp.view.Chart", {
    extend: "Ext.chart.Chart",

    // ...

    initComponent: function () {
        if (this.delayedRenderTo) {
            this.delayRender();
        }

        this.callParent();
    },

    delayRender: function () {
        Ext.TaskManager.start({
            scope: this,
            interval: 100,
            run: function () {
                var container = Ext.fly(this.delayedRenderTo);

                if (container) {
                    this.render(container);
                    return false;
                } else {
                    return true;
                }
            }
        });
    }
});   

So during initComponent(), we check for delayed render and prepare that if necessary. Otherwise, it renders as normal.

因此，在initComponent()中，我们检查延迟呈现并在必要时准备。否则，它呈现为正常。

The delayRender() function itself schedules a task to check every so often (100ms in this case) for the existence of an element with the given ID — i.e., to check whether the column has rendered. If not, returns true to reschedule the task. If so, renders the component and returns false to cancel the task.

delayRender()函数本身调度一个任务，以便经常检查(本例中为100ms)是否存在带有给定ID的元素—即。，检查列是否已呈现。如果没有，返回true来重新安排任务。如果是，则呈现组件并返回false以取消任务。

We've had good luck with this in the field, so I hope it works for you too.

我们在这个领域运气不错，所以我希望它对你也有用。

---

By the way, I was developing this as a part of answering my own question about ExtJS charting. That thread has the results of my performance testing. I was rendering 168 chart components in grid columns in 3-4s across most browsers and OSes. I imagine your sliders would render much faster than that.

顺便说一下，我是在开发这个作为回答我自己关于ExtJS制图的问题的一部分。这个线程有我的性能测试的结果。在大多数浏览器和操作系统中，我在3-4的网格列中渲染了168个图表组件。我想你们的滑块会比这快得多。

#3

Try something like this:

试试这样:

renderNumericFilter: function () {
    var id = Ext.id();
    Ext.defer(function () {
        Ext.widget('slider', {
            renderTo: id,
            width: 200,
            value: 50,
            increment: 10,
            minValue: 0,
            maxValue: 100,
        });
    }, 50);
    return Ext.String.format('<div id="{0}"></div>', id);
}

But I must say whatever you're trying to do - it doesn't sound right :) I don't think a bunch of sliders inside the grid will look good to the user.

但我必须说，无论你想做什么——这听起来都不正确:)我不认为网格中的一堆滑动器会对用户有好处。