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Data Grid
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Gantt - Validation
The DevExtreme JavaScript Gantt component allows you to validate relationships between tasks and handle errors. Set the enableDependencyValidation property to true to enable task validation.
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Backend API
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@using DevExtreme.MVC.Demos.Models.SampleData
@using DevExtreme.MVC.Demos.Models.Gantt
<div class="options">
<div class="caption">Options</div>
<div class="option">
@(Html.DevExtreme().CheckBox()
.Value(true)
.Text("Auto Update Parent Tasks")
.OnValueChanged("ganttAutoUpdateParentTaskss_changed")
)
</div>
<div class="option">
@(Html.DevExtreme().CheckBox()
.Value(true)
.Text("Enable Dependency Validation")
.OnValueChanged("ganttEnableDependencyValidation_changed")
)
</div>
<div class="option">
@(Html.DevExtreme().CheckBox()
.Value(true)
.Text("Enable Predecessor Gap")
.OnValueChanged("ganttEnablePredecessorGap_changed")
)
</div>
</div>
@(Html.DevExtreme().Gantt<Task>()
.ID("gantt")
.Validation(v => v.AutoUpdateParentTasks(true)
.ValidateDependencies(true)
.EnablePredecessorGap(true))
.Tasks(t => t
.DataSource(ds => ds.Array().Data(SampleData.GanttTasksJohnsonResidence).Key("ID"))
.KeyExpr("ID")
.TitleExpr("Title")
.ParentIdExpr("ParentId")
.StartExpr("Start")
.EndExpr("End")
.ProgressExpr("Progress")
)
.Dependencies(d => d
.DataSource(ds => ds.Array().Data(SampleData.GanttDependenciesJohnsonResidence).Key("ID"))
.KeyExpr("ID")
.PredecessorIdExpr("PredecessorId")
.SuccessorIdExpr("SuccessorId")
.TypeExpr("Type")
)
.Editing(e => e.Enabled(true))
.Columns(columns => {
columns.AddFor(m => m.Title)
.Caption("Task")
.Width(300);
columns.AddFor(m => m.Start)
.Caption("Start Date");
columns.AddFor(m => m.End)
.Caption("End Date");
})
.TaskListWidth(500)
.TaskTitlePosition(GanttTaskTitlePosition.None)
)
<script>
function getGanttInstance() {
return $("#gantt").dxGantt("instance");
}
function ganttAutoUpdateParentTaskss_changed(e) {
var ganttInstance = getGanttInstance();
ganttInstance.option("validation.autoUpdateParentTasks", e.value);
}
function ganttEnableDependencyValidation_changed(e) {
var ganttInstance = getGanttInstance();
ganttInstance.option("validation.validateDependencies", e.value);
}
function ganttEnablePredecessorGap_changed(e) {
var ganttInstance = getGanttInstance();
ganttInstance.option("validation.enablePredecessorGap", e.value);
}
</script>
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The Gantt supports the following dependency validation rules:
- Finish to Start (FS) - A successor task's start point should be equal or later than the preceding task's end point.
- Start to Start (SS) - A successor task's start point should be equal or later than the preceding task's start point.
- Finish to Finish (FF) - A successor task's end point should be equal or later than the preceding task's end point.
- Start to Finish (SF) - A successor task's end point should be equal or later than a preceding task's start point.
The Gantt also has the autoUpdateParentTasks property that enables validation for parent-child relationship:
- A parent task's duration equals a summary duration of its child tasks.
- A parent task and its first child starts at the same time.
- A parent task and its last child ends at the same time.
- A parent task's progress is a summary progress of its child tasks.
The Gantt processes changes in task values before they are saved to a database. The component displays a popup window with a list of available actions if an error can be handled in several ways.