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JavaScript Grid - blockSelectionValidate Event

const grid = new dhx.Grid("grid_container", {
    columns: [
        { id: "a", header: [{ text: "A" }] },
        { id: "b", header: [{ text: "B" }] },
    ],
    data: [
        { id: "1", a: "A1", b: "B1" },
        { id: "2", a: "A2", b: "B2" },
    ],
    blockSelection: true
});

grid.block.events.on("blockSelectionValidate", (validateCell, handle, event) => {
    if (cell.column.id === "b") {
        console.log("Selection cannot start from column B");
        return false;
    }
});

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