angular - Run Method on FormControl's valueChanges Event -


i have following code angular 2 type-ahead component:

this.question["input"] = new formcontrol(); this.question["input"].valuechanges         .debouncetime(400)         .switchmap(term => this.question['callback'](term))         .subscribe(             data => {                 this.question["options"].length = 0;                 this.question["options"].push(...data);             }         );

which working great, attempting add loading animation event, i.e. animation starts when formcontrol's value changes, , ends when data returned.

with said there way tap method chain code such following?

...     .valuechanges     /* start animation or run custom function here */     .switchmap(term => /* run ajax here */)     .subscribe(         data => {             /* end animation here */         }     ); ...

any assistance appreciated.

this has not been tested, similar code i've used in app... hope helps:

this.question["input"] = new formcontrol(); this.question["input"].valuechanges   .debouncetime(400)   .switchmap(term => this.question['callback'](term))   .subscribe(      data => {         this.question["options"].length = 0;         this.question["options"].push(...data);         this.startanimation();      },      () => {this.completeanimation()}   );  startanimation() {    //start animation code here }  completeanimation() {    //complete animation here. }

-

Comments

Post a Comment

Popular posts from this blog

unity3d - Rotate an object to face an opposite direction -

i have object , b. when click on object b, rotates object b (a faces b). b doesn't face a. need following : when faces b, need face opposite direction. have code rotating @ b. how rotate face opposite direction after that? vector3 targetdirection = target - transform.position; float step = speed * time.deltatime; vector3 newdirection = vector3.rotatetowards (turretdome.transform.forward, targetdirection, step, 0.0f); turretdome.transform.rotation = quaternion.lookrotation (newdirection); you object facing object b, want inverse direction of object after that? objecta.transform.rotation = quaternion.inverse(objecta.transform.rotation) but lets assume example turretdome object a, (negate direction): turretdome.transform.rotation = quaternion.lookrotation (-newdirection); naturally, both of these snippets not show how smoothen rotation, seem know how use time.deltatime. just incase unsure, quaternion.lerp this
Read more

angular - Is it possible to get native element for formControl? -

i've got angular2 reactive form . created formcontrol s , assigned input fields by [formcontrol]=... . understand creates nativeelement <-> formcontrol link. my question: possible nativeelement formcontrol ? wanna myformcontrol.nativeelement.focus() i can share 1 terrible solution works me. in reactive forms can use either 1) formcontroldirective ts mycontrol = new formcontrol('') template <input type="text" [formcontrol]="mycontrol"> or 2) formcontrolname ts myform: formgroup; constructor(private fb: formbuilder) {} ngoninit() { this.myform = this.fb.group({ foo: '' }); } template <form [formgroup]="myform"> <input type="text" formcontrolname="foo"> </form> so these directives write patch like 1) formcontroldirective const originformcontrolngonchanges = formcontroldirective.prototype.ngonchanges; formcontroldirective.proto...
Read more

javascript - Why jQuery Select box change event is now working? -

i working on product filters user select select box according his/her preference not getting selected value user in jquery. html code:- <select name="product_filter" id="product_filter"> <option value="price_low_first">price : low high</option> <option value="price_high_first">price : high low</option> <option value="latest">latest</option> <option value="popular">most popular</option> </select> jquery code: $(function () { $("#product_filter").change(function () { alert("hi") var selectedtext = $(this).find("option:selected").text(); var selectedvalue = $(this).val(); alert("selected text: " + selectedtext + " value: " + selectedvalue); }); }); hi believe code perfect. once please check jquery.min.js ...
Read more