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Data not showing in select dropdown after value is set

the foundation of my code is that I am taking data from ag-grid and showing that data into select drop-down (inside a popup) when "Edit" button is clicked.
But the data is not showing in the select drop-down.
When I click Edit, "YES" or "NO" should show as already selected in the drop-down based on the data I get from the grid. The code I used is mentioned below:-
<!-- Alter Part -->
<div class="form-group row">
<label for="alter_part" class="col-sm-3 col-form-label">Alter Part</label>
<div class="col-sm-9">
<select id="alter_part" class="form-control" onchange="alternatefunc();" required>
<option value="1">YES</option>
<option value="0">NO</option>
</select>
</div>
</div>
<!-- Test Type -->
<div class="form-group row">
<label for="test_type" class="col-sm-3 col-form-label">Select Test Type</label>
<div class="col-sm-9">
<select id="test_type" class="form-control" required>
<option value="1">YES</option>
<option value="0">NO</option>
</select>
</div>
</div>
function getInitialData(params)
{
//Setting value using grid data
document.getElementById('alter_part').value = params.node.data[params.columnApi.getAllGridColumns()[3].colId];
document.getElementById('test_type').value = params.node.data[params.columnApi.getAllGridColumns()[7].colId];
}
I have verified that the select drop-down stores the value from grid,
var a = document.getElementById('test_type').value;
variable "a" here returns the correct value of the grid row.

How to show the dropdown list based on the picklist values

I have an angular application in that I have to show the dropdown list based on the picklist values.
.service.ts
public getLists() {
let baseUrl = `/endpoint`;
this._restfulService
.restfulGetData(baseUrl)
.subscribe(
(LookupData: LookupData) => {
if (LookupData) {
this.option1data = LookupData.option1Data;
this.option2data = LookupData.option2Data;
this.option3data = LookupData.option3Data;
this.option4data = LookupData.option4Data;
}
},
(err) => {
console.error(err);
}
);
}
.component.html
<div class="row">
<div class="form-group">
<div class="col-sm-3">
<label for="action"> <b>Category</b></label>
</div>
<div class="col-sm-7">
<select>
<option value="" disabled [selected]="true"></option>
<option>option1</option>
<option>option2</option>
<option>option3</option>
<option>option4</option>
</select>
</div>
</div>
</div>
<div class="row>
<div class="form-group">
<div class="col-sm-3>
<label for="action"> <b>Lists</b></label>
</div>
<div class="col-sm-7">
<select>
<option value="" disabled [selected]="true"></option>
<option>
//In this dropdown I have to show the lists based on the selection of picklists
</option>
</select>
</div>
</div>
</div>
So In tha above code if I select option1 from the picklist I have to show the option1Data dropdownlist etc..
can anyone helpme on this

<div class="row">
<div class="form-group">
<div class="col-sm-3">
<label for="action"> <b>Lists</b></label>
</div>
<div class="col-sm-7">
<select>
<option disabled selected="true">Select pick</option>
<option *ngFor="let items of LookupData" [ngValue]="items.name">
{{ items.name }}
</option>
</select>
</div>
</div>
</div>
please put the above code in the HTML file. Hope this code will helpful to you

How to show or hide the data based on dropdown selection

In my angular application I have a dropdown list and below that some data is in div.
component.html
<select class="form-control" id="power" required>
<option value="" disabled selected>Select a category</option>
<option *ngFor="let category of categoryNames">{{ category }}</option>
</select>
<!--below code I have to show or hide-->
<div class="row">
<div class="col-sm-8">
<p>Slect Habits</p>
<h5 class="formxp">Slect Items</h5>
</div>
<div class="col-sm-4">
<p>Slect Habits</p>
<h5 class="formxp">Slect Items</h5>
</div>
</div>
So my requirement is when I click on any of the items from the dropdown list I have to show the div (after the dropdown in above code)
Can anyone help me regarding the same.

You can define a template variable (e.g. #mySelect) on the <select> element, then use it to determine the selected value: mySelect.value.
In case you need to display the div if the selected category equals to 'Habit', you can try the following:
<!-- #mySelect is declared on <select> element -->
<select class="form-control" id="power" required #mySelect>
<option value="" disabled selected>Select a category</option>
<option *ngFor="let category of categoryNames">{{ category }}</option>
</select>
<div class="row" *ngIf="mySelect.value === 'Habits'">
<div class="col-sm-8">
<p>Slect Habits</p>
<h5 class="formxp">Slect Items</h5>
</div>
<div class="col-sm-4">
<p>Slect Habits</p>
<h5 class="formxp">Slect Items</h5>
</div>
</div>
You can read more about the Angular Template Variable here:
https://angular.io/guide/template-reference-variables

First dropdown selection is not filtering second dropdown

I'm trying to filter dropdown based on selection of first dropdown, in my console log, everything is fine, but second dropdown allways showing all results, not filtered one, here is how I did it:
<!--Group-->
<div class="form-group">
<label class="control-label dash-control-label col-xs-3">GROUP:</label>
<div class="col-xs-9">
<select class="form-control" style="width: 100%;"
data-minimum-results-for-search="Infinity" name="articleGroups" required (change)="filterSubById(article.mainGroup.id)" [(ngModel)]="article.mainGroup">
<option disabled [ngValue]="null">-/-</option>
<option [ngValue]="group" *ngFor="let group of mainGroups">{{group.title}}</option>
</select>
</div>
</div>
<!--Subgroup-->
<div class="form-group">
<label class="control-label dash-control-label col-xs-3">SUBGROUP:</label>
<div class="col-xs-9">
<select class="form-control" style="width: 100%;" name="subGroup" required [(ngModel)]="article.subGroup">
<option disabled [ngValue]="null">-/-</option>
<option [ngValue]="subgroup" *ngFor="let subgroup of subGroups">{{subgroup.title}}</option>
</select>
</div>
</div>

You need to pass the outcome of the filterBySubId method back to the view. You're not doing anything with the returned value.
I'd do something like this:
filterSubById(Id) {
this.filteredSubGroups = this.subGroups.filter(item => item.parentId == Id);
}
and in view
<option [ngValue]="subgroup"
*ngFor="let subgroup of filteredSubGroups">{{subgroup.title}}</option>

Hide the form when clicked on a particular option of dropdown and show the form when clicked on a particular option of dropdown

I want to show a form when clicked on a particular option of a dropdown and hide the form when clicked on a particular option of a dropdown
This is my html code:
<div class="form-group" id="venue-select">
<select class="form-control venue-dropdown" id="" onchange="myFunction()">
<option value="none" id="#hide" ><b>Select Venue Type</b></option>
<option>Theme Restaurant</option>
<option>Blah restaurant</option>
<option>Flana Restaurant</option>
<option>Woops Restaurant</option>
</select>
</div>
<div class="row bgcolor show-form" style="display:none;">
<div class="col-lg-6 col-md-6 col-xs-12 col-sm-12">
<form>
<div class="form-group">
<label><strong>Venue Name</strong><sup class = "venue-imp">*</sup></label>
<input type="text" class="form-control input-lg" placeholder="Jhanqar Banquet Hall">
</div>
</form>
</div>
<div class="col-lg-6 col-md-6 col-xs-12 col-sm-12">
<form>
<div class="form-group">
<label><strong>Venue Price</strong><sup class = "venue-imp">*</sup></label>
<input type="text" class="form-control input-lg" placeholder="Jhanqar Banquet Hall">
</div>
</form>
</div>
</div>
it's working perfectly when i click on any venue in the dropdown but i want the form to hide when i click on select any venue
this is my javascript code:
/*show fom*/
function myFunction() {
$('.show-form').show();
// $('.show-form').hide();
}

Try to this
<select class="form-control venue-dropdown" id="" onchange="myFunction(this.value)">
<option value="Theme Restaurant 1">Theme Restaurant 1</option>
<option value="Theme Restaurant 2">Theme Restaurant 2</option>
</select>
<script>
function myFunction(select_value) {
if(select_value == 'Theme Restaurant 1')
{
$('.show-form').show();
}
}
</script>