How can I get hold on the <option> that was just selected when listening to the select2:select event? Note that this is simple when using a single-select, as when only one option is selected, that must be the one that was just selected. I would like to also be able to find the option that was just selected when using a multiple-select (<select multiple>).
In the select2:unselect event, the unselected <option> is available through e.params.data.element, but it is not so in the select2:select event. I do not see a reason why the <option> should not be available, since it is created at this time. For the select2:selecting event, however, the <option> is not yet created, and obviously cannot be available when the event is fired.
I've used the following to get the current selected in Select2 (it's for version 4 and up):
// single value
var test = $('#test');
test.on("select2:select", function(event) {
var value = $(event.currentTarget).find("option:selected").val();
console.log(value);
});
UPDATE: Multi Selected Values (with and without last selected)
// multi values, with last selected
var old_values = [];
var test = $("#test");
test.on("select2:select", function(event) {
var values = [];
// copy all option values from selected
$(event.currentTarget).find("option:selected").each(function(i, selected){
values[i] = $(selected).text();
});
// doing a diff of old_values gives the new values selected
var last = $(values).not(old_values).get();
// update old_values for future use
old_values = values;
// output values (all current values selected)
console.log("selected values: ", values);
// output last added value
console.log("last added: ", last);
});
$('#test').on('select2:select', function(e) {
var data = e.params.data;
console.log(data);
});
Related
The Angular Material documentation gives a nice example for how to add selection to a table (Table Selection docs). They even provide a Stackblitz to try it out.
I found in the code for the SelectionModel constructor that the first argument is whether there can be multiple selections made (true) or not (false). The second argument is an array of initially selected values.
In the demo, they don't have any initially selected values, so the second argument in their constructor (line 36) is an empty array ([]).
I want to change it so that there is an initially selected value, so I changed line 36 to:
selection = new SelectionModel<PeriodicElement>(true, [{position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'}]);
This changes the checkbox in the header to an indeterminate state (as expected), but does not cause the row in the table to be selected. Am I setting the initial value incorrectly, or what am I missing here? How can I set an initially selected value?
Tricky one. You need to initialize the selection by extracting that particular PeriodicElement object from your dataSource input, and passing it to the constructor.
In this particular case, you could code
selection = new SelectionModel<PeriodicElement>(true, [this.dataSource.data[1]);
It's because of the way SelectionModel checks for active selections.
In your table markup you have
<mat-checkbox ... [checked]="selection.isSelected(row)"></mat-checkbox>
You expect this binding to mark the corresponding row as checked. But the method isSelected(row) won't recognize the object passed in here as being selected, because this is not the object your selection received in its constructor.
"row" points to an object from the actual MatTableDataSource input:
dataSource = new MatTableDataSource<PeriodicElement>(ELEMENT_DATA);
But the selection initialization:
selection = new SelectionModel<PeriodicElement>(true, [{position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'}]);
happens with a new object you create on the fly. Your selection remembers THIS object as a selected one.
When angular evaluates the bindings in the markup, SelectionModel internally checks for object identity. It's going to look for the object that "row" points to in the internal set of selected objects.
Compare to lines 99-101 and 16 from the SelectionModel source code:
isSelected(value: T): boolean {
return this._selection.has(value);
}
and
private _selection = new Set<T>();
I was facing the same issue, I used dataSource to set the initial value manually in ngOnInit()
ngOnInit() {
this.dataSource.data.forEach(row => {
if (row.symbol == "H") this.selection.select(row);
});
}
If you do the following, it works too
selection = new SelectionModel<PeriodicElement>(true, [ELEMENT_DATA[1]])
To select all you can do
selection = new SelectionModel<PeriodicElement>(true, [...ELEMENT_DATA])
I hope the answer is helpful
Or more dynamically if you have a set of values and you want to filter them before:
selection = new SelectionModel<PeriodicElement>(true, [
...this.dataSource.data.filter(row => row.weight >= 4.0026)
]);
This gets more tricky if you have data loading asynchronously from an api. Here is how I did it:
Firstly I have implemented the DataSource from "#angular/cdk/table". I also have an RxJS Subject that fires whenever data is loaded (first time or when user changes page in the pagination section)
export abstract class BaseTableDataSource<T> implements DataSource<T>{
private dataSubject = new BehaviorSubject<T[]>([]);
private loadingSubject = new BehaviorSubject<boolean>(false);
private totalRecordsSubject = new BehaviorSubject<number>(null);
public loading$ = this.loadingSubject.asObservable();
public dataLoaded$ = this.dataSubject.asObservable();
public totalRecords$ = this.totalRecordsSubject.asObservable().pipe(filter(v => v != null));
constructor(){}
connect(collectionViewer: CollectionViewer): Observable<T[]>{
return this.dataSubject.asObservable();
}
disconnect(collectionViewer: CollectionViewer): void {
this.dataSubject.complete();
this.loadingSubject.complete();
this.totalRecordsSubject.complete();
}
abstract fetchData(pageIndex, pageSize, ...params:any[]) : Observable<TableData<T>>;
abstract columnMetadata(): {[colName: string]: ColMetadataDescriptor };
loadData(pageIndex, pageSize, params?:any[]): void{
this.loadingSubject.next(true);
this.fetchData(pageIndex, pageSize, params).pipe(
finalize(() => this.loadingSubject.next(false))
)
.subscribe(data => {
this.totalRecordsSubject.next(data.totalNumberOfRecords);
this.dataSubject.next(data.records)
});
}
}
Now when I want to pre-select a row, I can write a function like this in my component which hosts a table that uses an implementation of the above mentioned data source
selectRow(rowSelectionFn: (key: string) => boolean){
this.dataSource.dataLoaded$.pipe(takeUntil(this.destroyed$))
.subscribe(data => {
const foundRecord = data.filter(rec => rowSelectionFn(rec));
if(foundRecord && foundRecord.length >= 0){
this.selection.toggle(foundRecord[0]);
}
});
}
I just upgraded to version 4 and now my set data is not working
I'm doing the following, which worked fine before the update
Init
$("#fertilizer").select2({
data: listToLoad,
placeholder: mf('pleaseSelectFertilizer',"please select fertilizer")
}).on('change', function (e) {
var concentration = $("#fertilizer").select2('data')[0].concentration;
$("#typesOfConcentration").text(concentration);
$("#typesOfConcentrationDiv").removeClass("hide");
});
var fertilizer = $("#orders").select2('data')[0].fertilizer;
var fertilizerId = $("#orders").select2('data')[0].id;
var concentration = $("#orders").select2('data')[0].concentration;
$("#fertilizer").select2("data", {id: fertilizerId, text:fertilizer});
As noted in the release notes (twice actually), .select2("data") is read-only now. This will actually trigger a warning if you put Select2 into debug mode (setting the option debug to true).
In your case, you don't need to use .select2('data') at all. You appear to only be using it so you can re-map fertilizer to text, which should be done way before the option is selected. The id and text properties are required and it doesn't take much to re-map them before passing data to Select2.
var listToLoad = $.map(listToLoad, function (obj) {
obj.text = obj.text || obj.fertilizer;
return obj;
});
$("#fertilizer").select2({
data: listToLoad,
placeholder: mf('pleaseSelectFertilizer',"please select fertilizer")
}).on('change', function (e) {
var concentration = $("#fertilizer").select2('data')[0].concentration;
$("#typesOfConcentration").text(concentration);
$("#typesOfConcentrationDiv").removeClass("hide");
});
For everyone else who actually used .select2('data'), you should be able to use .val() now and just pass in the id that needs to be set. If you need to select an option which doesn't actually exist, you can just create the <option> for it (like you would in a standard <select>) ahead of time.
I want to display a previous value on Min Miles and that should not be editable. I want like
Default value of Min Miles is 0.
When I click on Add More Range then In the new form - Min Value should be Max Value of Previous Form.
I am using semantic form for. Please Help Me. How can I do this...
Regarding your second question, and assuming that the new form appears through javascript, without page reloading, you can grab the
field value with javascript and use it as the default value for the
new field. The "add new range"
Something Like
function getvalue(){
var inputTypes_max = [],inputTypes_min = [],inputTypes_amount = [];
$('input[id$="max_miles"]').each(function(){
inputTypes_max.push($(this).prop('value'));
});
$('input[id$="amount"]').each(function(){
inputTypes_amount.push($(this).prop('value'));
});
var max_value_of_last_partition = inputTypes_max[inputTypes_max.length - 2]
var amount_of_last_partition = inputTypes_amount[inputTypes_amount.length - 2]
if (max_value_of_last_partition == "" || amount_of_last_partition == "" ){
alert("Please Fill Above Details First");
}else{
$("#add_more_range_link").click();
$('input[id$="min_miles"]').each(function(){
inputTypes_min.push($(this).prop('id'));
});
var min_id_of_last_partition=inputTypes_min[inputTypes_min.length - 2]
$("#"+min_id_of_last_partition).attr("disabled", true);
$("#"+min_id_of_last_partition).val(parseInt(max_value_of_last_partition) + 1)
}
}
I have Used Jquery's End Selector In a loop to get all value of max and amount field as per your form and get the ids of your min_miles field and then setting that value of your min_miles as per max_miles
It worked For me hope It works For You.
Default value of a field can just be passed in the form builder as a second parameter:
...
f.input :min_miles, "My default value"
Of course I do not know your model structure but you get the idea.
Regarding your second question, and assuming that the new form appears through javascript, without page reloading, you can grab the field value with javascript and use it as the default value for the new field. The "add new range" click will be the triggerer for the value capture.
Something like (with jQuery):
var temp_value = '';
$('#add_more_range').click(function(){
temp_value = $('#my_form1 #min_miles').value();
$('#my_form2 #max_miles').value(temp_value);
});
Again I am just guessing the name of the selectors, but the overall approach should work.
If you are also adding dinamically to the page the "Add new range" buttons/links, then you should delegate the function in order to be inherited also for the so new added buttons:
$('body').on('click', '#add_more_range', function(){...});
I am using kendoUI tree view with check boxes implementation.
I am able to check all children's check boxes,when i select the parent checkbox.
now,I want to get all the children's text values when i select the parent check box.
I used template for check box operation in tree view
$("#ProjectUsersTreeView [type=checkbox]").live('change', function (e) { var chkbox = $(this);
var parent = chkbox.parent();
var pBox = $(parent).closest('.k-item').find(":checkbox");
if (this.checked || pBox.length>0) {
$(pBox).prop('checked',this.checked ? "checked": "")
}
Instead of using your code for checking children I do recommend using KendoUI configuration option checkChildren.
tree = $("#ProjectUsersTreeView").kendoTreeView({
checkboxes:{
checkChildren: true
},
...
}).data("kendoTreeView");
Then for getting all selected text use:
$("#ProjectUsersTreeView [type=checkbox]").live('change', function (e) {
var checked = $("input:checked", tree);
$.each(checked, function(idx, elem) {
console.log("text", tree.text(elem));
})
});
In checked I get all input elements from the tree that are actually checked and display its text on console by getting it using text method.
NOTE: Realize that I've defined tree as $("#ProjectUsersTreeView").data("kendoTreeView") and then use it in change handler.
I am trying to process multiple input selects in a form each one has a unique name and id.
here is my first try, this is broken when y = value.val(); executes
var selects = $("#pmWorkOrderProcedureStepsForm").find('select');
$.each(selects,
function(index, value)
{
y = value.val();
});
I can see in chrome debug that value has a reference to something that looks like
HTMLSelectElement#select-choice-400139826
Where select-choice-400139826 is my first select input name.
How do I get just the name and the selected value of the input from here.
New to jquery mobile!
You can use the following code snippet:
var selects = $("#pmWorkOrderProcedureStepsForm").find("select");
$.each(selects,function(){
name = $(this).attr('name');
value = $(this).val();
});
A demo here - http://jsfiddle.net/5xg6F/
Let me know if that helps.