I have an Appmaker form to create a record that includes a many to one relation to another table. By default, the form creates a dropdown to select the related record from a list. This works fine, but I need to barcode scan (or type) the item name rather than select it.
When I change the dropdown to a text box and bind it to the related table, it greys out and becomes unusable when I preview it. (I get a circle with a line through it when hovering over.)
When I keep both the dropdown and the textbox on the same form, I can select a record from the dropdown and it populates the textbox. After that, the textbox becomes editable and works as desired.
How can I remove the dropdown and make the text box editable?
The problem is that when you bind the textbox to a relational field it is looking for a record not just a value.
My thought is you are going to want to create a text box where you enter/scan in the value and leave it unbound. then in probably the onValueChange event write a script to query the item in the related table that you are trying to relate and set that equal to the field you are trying to edit.I don't know that this code will work haven't tested it but should get you going in the right direction:
var ds = app.datasources.Parts;
ds.query.filters.Part._equals = newValue;
ds.load(function() {
if (ds.item === null) {
alert("Part not found!");
widget.root.descendants.FieldPart.value = null;
}
else {
widget.root.descendants.FieldPart.value = ds.item;
}
});
I know how to add a button to a datagridview. What I am having a problem with is changing the text displayed based on whether a associated record exists in another table. I would like to change the text on the button to "View SR" or "Add SR" depending on if a service request exists for the record. if it even possible, how I would go about this ?
You just need to capture the exact cell and cast it in a Grid View Button Cell to adjust the value displayed. Following is a tried solution:
if (SomeTrueValue)
{
((DataGridViewButtonCell)dataGridView1.Rows[0].Cells[0]).Value = "Hello";
}
else
{
((DataGridViewButtonCell)dataGridView1.Rows[0].Cells[0]).Value = "World";
}
in the Agenda view for the Kendo-UI scheduler, it displays "Date, Time, Event" columns. I also have an extra column that displays a different attribute of the event I am displaying.
What I want to accomplish is to switch the positioning of the extra column with the "Date" column. I had found a few things, such as kendo grid reordering and also using css to change placement in the scheduler, but neither method seems applicable to my situation. The css in particular was using float left/right, but that messes up the columns instead.
Below are links to the images of my issue as well as the classes they are assigned on the scheduler.
AgendaCols
classInfo
Also, as a bonus, I'd like to know if I can add a title in the orange part of the first picture, since it's currently blank while the other three each have a title that is built-in.
Thanks for your time,
Alpr
You can specify date: true specifically for the Agenda view by specifying this in the scheduler's options object:
views: [{
type: "agenda",
group: {
date: true
}
}, "week", "day"]
Notice that the group's date: true setting is inside the agenda entry in the views array.
when triggering navigation event, this solved my issue (this.schedule is what my kendo scheduler is declared as):
navigate(event: any) {
if (event != null) {
...omitted...
if (event.view == "agenda") {
this.schedule.options.group.date = true;
} else {
this.schedule.options.group.date = false;
}
...omitted...
};
};
How to define a Combo Column in Gridview which bind an Enum (as possibilities), but which has as default value coming from object coming from a List which bind the grid view?
The problem is coming from the bindlist which will display the different options in the combo should be a list of string... Kind of: 'None', 'True', 'False', 'Maybe'...
And the default value is coming from object.field1 which is coming from of List binded to the grid view.
Get it!!
settings.Columns.Add(column =>
{
column.FieldName = "field_name";
column.EditorProperties().ComboBox(p =>
{
p.DataSource = Enum.GetNames(typeof(Definition_of_Enum));
});
});
By Deveexpress support...
As is typical for grids in a "dashboard" application that monitors dynamically changing data, my (Telerik) Kendo UI grid is refreshed with fresh data periodically, every 60 seconds:
grid.dataSource.data(freshData);
grid.refresh(); // have been informed this refresh may not be necessary
The schema does not change, but some new rows might show up in the dataset and some might have been removed.
Although the grid.refresh() leaves the groupings intact, and the sort state is also preserved, any collapsed groups get expanded.
QUESTION: How to preserve (or restore) the expanded/collapsed state of the groups (so a user focusing on a particular expanded group with the other groups collapsed is not inconvenienced/frustrated by the periodic updates in which every group gets re-expanded by default)?
EDIT: Some Winforms grids provide a way to "take a snapshot" of the group expand/collapse state before refreshing data, and then to reapply that state after the datasource refresh. If the group header rows in the Kendo UI grid had UIDs (that survived a refresh) it could be done. But see the suggested approach below that does not involve persistent UIDs.
USE CASE:
Here is a typical if somewhat dramatic use case for this feature. Center for Disease Control is monitoring real-time outbreaks of a particular strain of flu, by city. Every 15 seconds the dataset is being refreshed. They happen to be focusing at the moment on Los Angeles and have that city expanded, and the other cities collapsed. If every 15 seconds the entire grid expands, it pisses off the doctors at the CDC and they go in and strangle the programmer and then they go home to play golf, and everyone in Los Angeles succumbs. Does Kendo really want to be responsible for that disaster?
POSSIBLE FEATURE ENHANCEMENT SUGGESTION:
Ignore my suggestion about a UID above. Here's a better way.
The grid has
<div class="k-group-indicator" data-field="{groupedByDataFieldName}">
...
</div>
Now, if that k-group-indicator div could contain a list of the distinct values of data-field with each key's associated data being the expanded/collapsed state of the corresponding section, it would then be possible to save that list to a buffer before making a call to the dataSource.data( someNewData) method, and then in the eventhandler listening for dataBound event, those expand states could be reapplied. To find the corresponding grouping section for the grouping value, it would be very helpful if the k-grouping-row could have a property called group-data-value which held the grouping value of the particular grouping section, e.g. "Sales" or "Marketing" if one were grouping by a data-field called Department.
<div class="k-group-indicator" data-field="dept" data-title="Dept" data-dir="asc">
...
<div class="k-group-distinct-values">
<div group-data-value="Sales" aria-expanded="false" />
<div group-data-value="Events Planning" aria-expanded="true" />
</div>
</div>
and then in the k-grouping-row: <tr class="k-grouping-row" group-data-value="Sales">
It is understandable that this isn't a built-in feature. It is pretty complicated because if you have nested groupings, you would have to remember each collapsed group in the hierarchy that it existed in. Since items will be moving in and out of the DataSource, this would be a pain to track.
That said, here is a very hackish way to accomplish what you want, as long as you don't get too complicated. It just uses the groupHeaderTemplate property to add a UID to each grouping row. I am just using the column name + value as the UID, which is technically wrong if you get into multiple groupings, but it is good enough for an example.
From there, before you refresh you can find the collapsed groups from the ARIA attribute that Kendo has now (side-note, you have to be using 2012 Q3 for this to work). Then drill down and get the UID that was added by the template.
After the refresh, you can find the rows with a matching UID and pass them to the grid's .collapseGroup() function to re-collapse it.
Here is a working jsFiddle that demonstrates this.
And the code from the jsFiddle copy/pasted in (please note that I only set the template on the City column, so only the City column will preserve grouping collapse in this example!):
HTML:
<button id="refresh">Refresh</button>
<div id="grid" style="height: 380px"></div>
JavaScript:
var _getCollapsedUids = function () {
var collapsedUids = [];
$("#grid .k-grouping-row span[data-uid]")
.each(function(idx, item) {
if($(item)
.closest(".k-grouping-row")
.children("td:first")
.attr("aria-expanded") === "false") {
collapsedUids.push($(item).data("uid"));
}
}
);
return collapsedUids;
};
var _collapseUids = function (grid, collapsedUids) {
$("#grid .k-grouping-row span[data-uid]")
.each(function(idx, item) {
if($.inArray($(item).data("uid"), collapsedUids) >= 0) {
console.log("collapse: " + $(item).data("uid"))
grid.collapseGroup($(item).closest("tr"));
}
}
);
};
var refresh = function () {
var collapsedUids = _getCollapsedUids();
var grid = $("#grid").data().kendoGrid;
grid.dataSource.data(createRandomData(50));
_collapseUids(grid, collapsedUids);
};
$("#refresh").click(refresh);
$("#grid").kendoGrid({
dataSource: {
data: createRandomData(50),
pageSize: 10
},
groupable: true,
sortable: true,
pageable: {
refresh: true,
pageSizes: true
},
columns: [ {
field: "FirstName",
width: 90,
title: "First Name"
} , {
field: "LastName",
width: 90,
title: "Last Name"
} , {
width: 100,
field: "City",
groupHeaderTemplate: '<span data-uid="City-#=value#">#= value #</span>'
} , {
field: "Title"
} , {
field: "BirthDate",
title: "Birth Date",
template: '#= kendo.toString(BirthDate,"dd MMMM yyyy") #'
} , {
width: 50,
field: "Age"
}
]
});
Personally I don't really like this solution at all. It is way too hacky and way too much DOM traversal. However without re-implementing the grid widget I can't think of a better way to do it. Maybe it will be good enough for what you are trying to accomplish or give you a better idea.
One last note; I checked the Kendo UI source code and it does not appear to track which groupings are expanded/collapsed. They do something similar to what I did with the aria attribute, but instead check the class that drives the icon state:
if(element.hasClass('k-i-collapse')) {
that.collapseGroup(group);
} else {
that.expandGroup(group);
}
If you are not using Kendo 2012 Q3 and can't use the aria-expanded attribute, you could change the code to check the icon class instead.
I've started a robust group state preservation grid extension that is designed to work with both Kendo Grid and ASP.Net RadGrid (control-specific implementations that utilize common functionality).
This extension makes significant improvements to Telerik's group state preservation example and enhances RadGrid, for which nothing else available even comes close to the Kendo UI example. You can see the list of improvements here, and you can check out the code here.
I'd like to know what you think.
"Answering" my own question just to get the better legibility of the code-formatting in the answer-editor. This is an extension of the discussion.
I agree that nested groupings are more complicated. If each k-grouping-row had a property containing a JSON-representation of the array of distinct data values on which the grouping is based, it would be possible for developers to extract the distinct combinations of data-values from each collapsed k-grouping-row. (It would help if the k-grouping-row directly indicated whether it was expanded or collapsed but that info can be obtained from the cell it contains, right?)
With this set of distinct-values for collapsed groups in hand, one could construct ones own map to the collapsed groups. The distinct data values could act as the key to the objects in this map; each distinct-data combination being unique and associated with only one grouping section in the grid, no matter how many levels of nesting are involved.
For example, for a two-tiered nesting by Department by ProductType we would see something like this:
<tr class="k-grouping-row" data-distinct-values="['Sales','Toys, Games and Videos']">.
The Department value is "Sales" and the ProductType value is "Toys, Games and Videos". The JSON handles commas in the data value.
For a three-tiered grouping by state, city, zipcode we would have:
... data-distinct-values="['California','Beverly Hills','90210']"
These data values are known when the group is created so they are available to be injected into the k-grouping-row as a unique handle to it.
Although the distinct-values are a unique handle, they do not eliminate the need to traverse the DOM, visiting each and every k-grouping-row when one wants to reapply the collapsed state. Yet the Kendo grid would not have to implement the restoration of the collapsed state by default, if it was felt that this was too expensive an operation. But you would be giving developers a simple way to accomplish it using data-distinct-values=[...], and the developers could decide for themselves whether the performance hit, if any, was justified by the requirements of the application.
This is not supported out of the box, but it can be achieved by maintaining an array of the expanded groups (or collapsed clusters).
At a high level - you use a marker to find if a group is collapsed or expanded. Then maintain a list of groups that expanded and only expand those when you refresh your grid.
In my case, I use the default kendo icon that is different for expanded groups (.k-i-collapse) versus collapsed groups (.k-i-expand).
var expandedGroups = [];
The expandedGroups is available globally to me. Modify this as per your need.
Then on save or discard changes of the kendo grid, I call the below method, that is - call it BEFORE your code is doing the grid.refresh() orgrid.dataSource.read() that is triggering the grouping states to be lost.
function updateExpandedGroupsList() {
expandedGroups = []; // reset state
// find the list of group labels adjacent to expanded group icons
var listOfExpandedGroupsLabels = $("#gridId .k-icon.k-i-collapse~span");
for (i = 0; i < listOfExpandedGroupsLabels .length; i++) {
expandedGroups.push(listOfExpandedGroupsLabels [i].innerHTML);
}
}
So what I'm doing in the above method is finding all the instances of the little expand arrow that is pointing downwards, then finding the sibling spans which have the names of the groups, that we need to store on our expandedGroups array for later use.
Now that we have that, your action that is resetting the grid will happen and likely the dataBound or another event will be fired after. In that piece of the code, you have something that is (let's say) collapsing all the groups by default. There, you need to do the reverse process: Find the span and the group name from the iterating group control and check if it is in the list of expandedGroups. If it is, then don't collapse it (or expand it).
collapseGroups(expandedGroups);
After calling the collapse groups and passing the array:
// method collapse groups, excluded groups will not be touched
function collapseGroups(listOfExcludedGroups) {
var grid = $("#gridId").data("kendoGrid");
if (!listOfExcludedGroups) {
listOfExcludedGroups = [];
}
$(".k-grouping-row").each(function () {
var groupName = $(this).find("span")[0].innerHTML;
if (groupName && listOfExcludedGroups.indexOf(groupName) > -1) {
return; // continue
}
grid.collapseGroup(this);
});
}
First of all you rarely need to call refresh from your code. The grid (and all data-bound Kendo widgets) are listening for changes of the data source and will refresh accordingly.
By design the expand/collapse state of the groups is not preserved. Changing the data source will cause all groups to get expanded (which is their default state).