Question

After reading this article, I’ve managed to change rendering.

I’m calling an internal function:

renderer: this.onRenderCell

And this function is like this:

onRenderCell: function(value, metaData, record, rowIndex,
  colIndex, store, view) {
  metaData.css = 'ini-cell-pas-traduit';
  return '«'+value+'»';
}   

If you read carefully I return '«'+value+'»'; so for each value it is transformed to: ‘«value»‘; . This is a proof that on every single line, it works perfectly. So should it be for the css. But the css is applied one time out of two!! This drives me nuts.

Here’s what it gives (latest Firefox, same with latest Chrome):

Any idea where I should take a look?

Here’s a big sample of my source code:

Ext.define('Lang.grid.Panel', {
    extend: 'Ext.grid.Panel',
    alias: 'widget.langgrid',

    requires: [
        'Ext.grid.plugin.CellEditing',
        'Ext.form.field.Text',
        'Ext.toolbar.TextItem'
    ],

    initComponent: function(){

        this.editing = Ext.create('Ext.grid.plugin.CellEditing');

        Ext.apply(this, {
            iconCls: 'icon-grid',
            plugins: [this.editing],
            dockedItems: [{
                xtype: 'toolbar',
                items: [{
                    iconCls: 'icon-add',
                    text: 'Add',
                    scope: this,
                    handler: this.onAddClick
                }, {
                    iconCls: 'icon-delete',
                    text: 'Delete',
                    disabled: true,
                    itemId: 'delete',
                    scope: this,
                    handler: this.onDeleteClick
                }]
            }],
            columns: [{
                text: 'label',
                flex:2,
                sortable: true,
                dataIndex: 'label'
            },{
              header: 'fr',
              flex: 3,
              sortable: true,
              dataIndex: 'fr',
              renderer: this.onRenderCell,
              field: {
                type: 'textfield'
              }
            },{
              header: 'es',
              flex: 3,
              sortable: true,
              dataIndex: 'es',
              renderer: this.onRenderCell,
              field: {
                type: 'textfield'
              }
            },{
              header: 'us',
              flex: 3,
              sortable: true,
              dataIndex: 'us',
              renderer: this.onRenderCell,
              field: {
                type: 'textfield'
              }
            }
            ]
        });
        this.callParent();
        this.getSelectionModel().on('selectionchange', this.onSelectChange, this);
    },

    (...)
    (snip useless code)
    (...)

    onRenderCell: function(value, metaData, record, rowIndex,
      colIndex, store, view) {
      metaData.css = 'ini-cell-pas-traduit';
      return '<span style="color:red; font-weight:bold;">&laquo;'+
        value+'&raquo;</span>';
    }
});

Answer 1

In the metadata.css (ini-cell-pas-traduit) do this for background-color

background-color : red !important //or whichever color you've specified.

EDIT :
This is happening because the grid is configured with stripeRows : true. I dunno if this is done by default or you did it in the config but forgot to mention it here. When you use stripeRows it sets a background-color which can be overriden using the !important keyword.