Update value in select depending from other field in Angular 8 - javascript

I'm trying to update the value in select in Angular 8.
I found that I can use:
$('#selectSeccion').val("SeccionOption");
This select is the next one:
<select name="seccion" class="form-control" id = "selectSeccion">
<option *ngFor="let seccion of seccion" [ngValue]="seccion">{{seccion.seccion}}</option>
</select>
jQuery code is not working when I use the select with Angular, only works when select is normal html like the next one:
<select class="form-control" id = "prueba">
<option value = ""></option>
<option value = "other">other</option>
</select>
How can I update the value on the "ng" select?

I would not recommend using jQuery along with Angular.
you can read more about it here: http://www.learnangularjs.net/using-jquery-with-angular.php
The simplest way
component.html:
<select [(ngModel)]="selectModel" (change)="selectionChange()">
<option [value]="seccion" *ngFor="let seccion of seccions"> {{seccion}}</option>
</select>
component.ts:
selectionChange() {
console.log(this.selectModel)
}
changing the selectModel parameter will trigger the select to change as well.

Based on previous recommendation I can updated using Angular, which always was the best way by the way. No jQuery. I have to change my select to the next one
<select name="seccion" class="form-control" id = "selectSeccion" [(ngModel)]="value" #ctrl="ngModel">
<option *ngFor="let seccion of seccion" >{{seccion.seccion}}</option>
</select>
Adding this on select tag > [(ngModel)]="value" #ctrl="ngModel" and updating the ts file with this lines:
value : string = '';
updatingFunction(){ this.value = "SeccionUpdated"; }
I left it if there someone needs it

Related

Angular2 - update select template from component

I have a select element in my component template that is hooked up a selectedEmp model.I want to be able to update the selectedEmp in the component and have the correct value show in the select element. My current setup is not letting this happen. Instead the select value does not display the selectedEmp. I console logged the selectedEmp, and its value is changing. I think this is because the option element is never set to any value when i do it via the component. Does anyone know a way to do this.
Component.html
<select name="sel1" class="form-control" (ngModelChange)="onChange($event.target.value)" [(ngModel)]="selectedEmp">
<option [value]="employee" *ngFor="let employee of employees">
{{employee}}
</option>
</select>
Component.ts
employees:Array<string> = ["Andrew","Allen","Kevin","Phil"];
visable:boolean = false;
selectedEmp:any = null;
constructor(){}
// Selection change
onChange(value:any):void {
console.log(value);
}
updateModel(){
this.selectedEmp = "Allen"
}
It's not quite clear from your question but I did see one error on your (ngModelChange) event binding, since the items are strings, $event.target.value fails try (ngModelChange)="onChange($event)".
But that was only for console anyway, so removing it leaves:
<button type="button" (click)="updateModel()">Select Allen</button>
<select name="sel1" [(ngModel)]="selectedEmp">
<option [value]="employee" *ngFor="let employee of employees">
{{employee}}
</option>
</select>

Getting value from select drop-down [duplicate]

Usually I use $("#id").val() to return the value of the selected option, but this time it doesn't work.
The selected tag has the id aioConceptName
html code
<label for="name">Name</label>
<input type="text" name="name" id="name" />
<label for="aioConceptName">AIO Concept Name</label>
<select id="aioConceptName">
<option>choose io</option>
<option>roma</option>
<option>totti</option>
</select>
For dropdown options you probably want something like this:
For selected text
var conceptName = $('#aioConceptName').find(":selected").text();
For selected value
var conceptName = $('#aioConceptName').find(":selected").val();
The reason val() doesn't do the trick is because clicking an option doesn't change the value of the dropdown--it just adds the :selected property to the selected option which is a child of the dropdown.
Set the values for each of the options
<label for="aioConceptName">AIO Concept Name</label>
<select id="aioConceptName">
<option value="0">choose io</option>
<option value="1">roma</option>
<option value="2">totti</option>
</select>
$('#aioConceptName').val() didn't work because .val() returns the value attribute. To have it work properly, the value attributes must be set on each <option>.
Now you can call $('#aioConceptName').val() instead of all this :selected voodoo being suggested by others.
I stumbled across this question and developed a more concise version of Elliot BOnneville's answer:
var conceptName = $('#aioConceptName :selected').text();
or generically:
$('#id :pseudoclass')
This saves you an extra jQuery call, selects everything in one shot, and is more clear (my opinion).
Try this for value...
$("select#id_of_select_element option").filter(":selected").val();
or this for text...
$("select#id_of_select_element option").filter(":selected").text();
If you are in event context, in jQuery, you can retrieve the selected option element using :
$(this).find('option:selected') like this :
$('dropdown_selector').change(function() {
//Use $option (with the "$") to see that the variable is a jQuery object
var $option = $(this).find('option:selected');
//Added with the EDIT
var value = $option.val();//to get content of "value" attrib
var text = $option.text();//to get <option>Text</option> content
});
Edit
As mentioned by PossessWithin, My answer just answer to the question : How to select selected "Option".
Next, to get the option value, use option.val().
Have you considered using plain old javascript?
var box = document.getElementById('aioConceptName');
conceptName = box.options[box.selectedIndex].text;
See also Getting an option text/value with JavaScript
$('#aioConceptName option:selected').val();
For good practice you need to use val() to get value of selected options not text().
<label>Name</label>
<input type="text" name="name" />
<select id="aioConceptName">
<option value="choose">choose io</option>
</select>
You can use
$("#aioConceptName").find(':selected').val();
Or
$("#aioConceptName :selected").val();
Reading the value (not the text) of a select:
var status = $("#Status").val();
var status = $("#Status")[0].value;
var status = $('#Status option:selected').val();
How to disable a select?
in both variants, value can be changed using:
A
User can not interact with the dropdown. And he doesn't know what other options might exists.
$('#Status').prop('disabled', true);
B
User can see the options in the dropdown but all of them are disabled:
$('#Status option').attr('disabled', true);
In this case, $("#Status").val() will only work for jQuery versions smaller than 1.9.0. All other variants will work.
How to update a disabled select?
From code behind you can still update the value in your select. It is disabled only for users:
$("#Status").val(2);
In some cases you might need to fire events:
$("#Status").val(2).change();
With JQuery:
If you want to get the selected option text, you can use $(select element).text().
var text = $('#aioConceptName option:selected').text();
If you want to get selected option value, you can use $(select element).val().
var val = $('#aioConceptName option:selected').val();
Make sure to set value attribute in <option> tag, like:
<select id="aioConceptName">
<option value="">choose io</option>
<option value="roma(value)">roma(text)</option>
<option value="totti(value)">totti(text)</option>
</select>
With this HTML code sample, assuming last option is selected:
var text will give you totti(text)
var val will give you totti(value)
$(document).on('change','#aioConceptName' ,function(){
var val = $('#aioConceptName option:selected').val();
var text = $('#aioConceptName option:selected').text();
$('.result').text("Select Value = " + val);
$('.result').append("<br>Select Text = " + text);
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="aioConceptName">
<option value="io(value)">choose io</option>
<option value="roma(value)">roma(text)</option>
<option value="totti(value)">totti(text)</option>
</select>
<p class="result"></p>
you should use this syntax:
var value = $('#Id :selected').val();
So try this Code:
var values = $('#aioConceptName :selected').val();
you can test in Fiddle: http://jsfiddle.net/PJT6r/9/
see about this answer in this post
to find correct selections with jQuery consider multiple selections can be available in html trees and confuse your expected output.
(:selected).val() or (:selected).text() will not work correct on multiple select options. So we keep an array of all selections first like .map() could do and then return the desired argument or text.
The following example illustrates those problems and offers a better approach
<select id="form-s" multiple="multiple">
<option selected>city1</option>
<option selected value="c2">city2</option>
<option value="c3">city3</option>
</select>
<select id="aioConceptName">
<option value="s1" selected >choose io</option>
<option value="s2">roma </option>
<option value="s3">totti</option>
</select>
<select id="test">
<option value="s4">paloma</option>
<option value="s5" selected >foo</option>
<option value="s6">bar</option>
</select>
<script>
$('select').change(function() {
var a=$(':selected').text(); // "city1city2choose iofoo"
var b=$(':selected').val(); // "city1" - selects just first query !
//but..
var c=$(':selected').map(function(){ // ["city1","city2","choose io","foo"]
return $(this).text();
});
var d=$(':selected').map(function(){ // ["city1","c2","s1","s5"]
return $(this).val();
});
console.log(a,b,c,d);
});
</script>
see the different bug prone output in variant a, b compared to correctly working c & d that keep all selections in an array and then return what you look for.
Just this should work:
var conceptName = $('#aioConceptName').val();
$(function() {
$('#aioConceptName').on('change', function(event) {
console.log(event.type + " event with:", $(this).val());
$(this).prev('input').val($(this).val());
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<label>Name</label>
<input type="text" name="name" />
<select id="aioConceptName">
<option>choose io</option>
<option>roma</option>
<option>totti</option>
</select>
Using jQuery, just add a change event and get selected value or text within that handler.
If you need selected text, please use this code:
$("#aioConceptName").change(function () {
alert($("#aioConceptName :selected").text())
});
Or if you need selected value, please use this code:
$("#aioConceptName").change(function () {
alert($("#aioConceptName :selected").attr('value'))
});
For anyone who found out that best answer don't work.
Try to use:
$( "#aioConceptName option:selected" ).attr("value");
Works for me in recent projects so it is worth to look on it.
Use the jQuery.val() function for select elements, too:
The .val() method is primarily used to get the values of form elements
such as input, select and textarea. In the case of select elements, it
returns null when no option is selected and an array containing the
value of each selected option when there is at least one and it is
possible to select more because the multiple attribute is present.
$(function() {
$("#aioConceptName").on("change", function() {
$("#debug").text($("#aioConceptName").val());
}).trigger("change");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select id="aioConceptName">
<option>choose io</option>
<option>roma</option>
<option>totti</option>
</select>
<div id="debug"></div>
Straight forward and pretty easy:
Your dropdown
<select id="aioConceptName">
<option>choose io</option>
<option>roma</option>
<option>totti</option>
</select>
Jquery code to get the selected value
$('#aioConceptName').change(function() {
var $option = $(this).find('option:selected');
//Added with the EDIT
var value = $option.val(); //returns the value of the selected option.
var text = $option.text(); //returns the text of the selected option.
});
For get value of tag selected:
$('#id_Of_Parent_Selected_Tag').find(":selected").val();
And if you want to get text use this code:
$('#id_Of_Parent_Selected_Tag').find(":selected").text();
For Example:
<div id="i_am_parent_of_select_tag">
<select>
<option value="1">CR7</option>
<option value="2">MESSI</option>
</select>
</div>
<script>
$('#i_am_parent_of_select_tag').find(":selected").val();//OUTPUT:1 OR 2
$('#i_am_parent_of_select_tag').find(":selected").text();//OUTPUT:CR7 OR MESSI
</script>
You can try to debug it this way:
console.log($('#aioConceptName option:selected').val())
I hope this also helps to understand better and helps
try this below,
$('select[id="aioConceptName[]"] option:selected').each(function(key,value){
options2[$(this).val()] = $(this).text();
console.log(JSON.stringify(options2));
});
to more details please
http://www.drtuts.com/get-value-multi-select-dropdown-without-value-attribute-using-jquery/
If you want to grab the 'value' attribute instead of the text node, this will work for you:
var conceptName = $('#aioConceptName').find(":selected").attr('value');
Here is the simple solution for this issue.
$("select#aioConceptName").change(function () {
var selectedaioConceptName = $('#aioConceptName').find(":selected").val();;
console.log(selectedaioConceptName);
});
try to this one
$(document).ready(function() {
$("#name option").filter(function() {
return $(this).val() == $("#firstname").val();
}).attr('selected', true);
$("#name").live("change", function() {
$("#firstname").val($(this).find("option:selected").attr("value"));
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.3.0/jquery.min.js"></script>
<select id="name" name="name">
<option value="">Please select...</option>
<option value="Elvis">Elvis</option>
<option value="Frank">Frank</option>
<option value="Jim">Jim</option>
</select>
<input type="text" id="firstname" name="firstname" value="Elvis" readonly="readonly">
$('nameofDropDownList').prop('selectedIndex', whateverNumberasInt);
Imagine the DDL as an array with indexes, you are selecting one index. Choose the one which you want to set it to with your JS.
You can use $("#drpList").val();
to fetch a select with same class= name you could do this, to check if a select option is selected.
var bOK = true;
$('.optKategorien').each(function(index,el){
if($(el).find(":selected").text() == "") {
bOK = false;
}
});
I had the same issue and I figured out why it was not working on my case
The html page was divided into different html fragments and I found that I have another input field that carries the same Id of the select, which caused the val() to be always empty
I hope this saves the day for anyone who have similar issue.
Try
aioConceptName.selectedOptions[0].value
let val = aioConceptName.selectedOptions[0].value
console.log('selected value:',val);
<label>Name</label>
<input type="text" name="name" />
<select id="aioConceptName">
<option>choose io</option>
<option>roma</option>
<option>totti</option>
</select>
There is only one correct way to find selected option - by option value attribute. So take the simple code:
//find selected option
$select = $("#mySelect");
$selectedOption = $select.find( "option[value=" + $select.val() + "]" );
//get selected option text
console.log( $selectedOption.text() );
So if you have list like this:
<select id="#mySelect" >
<option value="value1" >First option</option>
<option value="value2" >Second option</option>
<option value="value3" selected >Third option</option>
</select>
If you use selected attribute for option, then find(":selected") will give incorrect result because selected attribute will stay at option forever, even user selects another option.
Even if user will selects first or second option, the result of $("select option:selected") will give two elements! So $("select :selected").text() will give a result like "First option Third option"
So use value attribute selector and don't forget to set value attribute for all options!
You many try this:
var ioConceptName = $('#ioConceptName option:selected').text();

Blank select option #ngValue

How can I avoid blank option in the form output?
<select class="form-control" ng-model="item.type" >
<option ng-value="0">Real</option>
<option ng-value="1">Fake</option>
<option ng-value="2">Both</option>
</select>
item.type is set in the controller
The issue slightly different from what I saw in similar topics because of usage of ng-value and the fact, that value of item.type is already set
Edit: Changing ng-value to value solved the issue.
How is item.type set in the controller?
The blank line is the current value of item.type. If you set it as an object in the controller, it's normal to be shown that way. Try setting it to one of the 3 choices you have like this:
angular.module('yourModule').controller('ctrl', function($scope)){
$scope.item = {}; //edited
$scope.item.type = "1"; // or 2, or 0
}
This is how angular handles two-way databinding. If the value of your item.type does not match any of the options, it is normal to add another blank line.
EDIT:
<select class="form-control" ng-model="item.type" >
<option value="0">Real</option>
<option value="1">Fake</option>
<option value="2">Both</option>
</select>
The problem of blank option is due to the ng-model is not matching with the ng-option values. Could you just print the value of item.type in view using {{item.type}}.
Make the following changes.
In controller set the item.type as
$scope.item = {};
$scope.item.type = "1";
make the following changes in html.
<select class="form-control" ng-model="item.type" >
<option value="0">Real</option>
<option value="1">Fake</option>
<option value="2">Both</option>
</select>

make a select dependent with js

I would like to do a select option dependent of another select, i saw there's a way using array with fixed values, but my array is reloaded every time we add a new form field on the form. I would like something like when i select op1, then it just show op1 options on second select.
<select id="id1" name="optionshere">
<option relone="op1">opt one</option>
<option relone="op2">opt two</option>
</select>
<select id="id2" name="resulthere">
<option relone="op1">ans 1 op1</option>
<option relone="op1">ans 2 op2</option>
<option relone="op2">ans 1 op2</option>
</select>
Any idea?
thanks all
Here's a method without jQuery:
When you select an option in the first selectbox, it will hide everything that doesn't match its relone.
var id1 = document.getElementById("id1");
var id2 = document.getElementById("id2");
id1.addEventListener("change", change);
function change() {
for (var i = 0; i < id2.options.length; i++)
id2.options[i].style.display = id2.options[i].getAttribute("relone") == id1.options[id1.selectedIndex].getAttribute("relone") ? "block" : "none";
id2.value = "";
}
change();
<select id="id1" name="optionshere">
<option relone="op1">opt one</option>
<option relone="op2">opt two</option>
</select>
<select id="id2" name="resulthere">
<option relone="op1">ans 1 op1</option>
<option relone="op1">ans 2 op1</option>
<option relone="op2">ans 1 op2</option>
</select>
If Jquery is an option you may go with something like this:
<script type='text/javascript'>
$(function() {
$('#id1').change(function() {
var x = $(this).val();
$('option[relone!=x]').each(function() {
$(this).hide();
});
$('option[relone=x]').each(function() {
$(this).show();
});
});
});
</script>
Then to expand:
There really are many ways in which you can solve this predicament, depending on how variable your pool of answers is going to be.
If you're only interested in using vanilla javascript then let's start with the basics. You're going to want to look into the "onchange" event for your html, so as such:
<select onchange="myFunction()">
Coming right out of the w3schools website, on the Html onchange event attribute:
The onchange attribute fires the moment when the value of the element
is changed.
This will allow you to make a decision based on this element's value. Then inside your js may branch out from here:
You may use Ajax and pass to it that value as a get variable to obtain those options from a separate file.
You may get all options from the second div through a combination of .getElementbyId("id2") and .getElementsByTagName("option") then check for their individual "relone" attribute inside an each loop, and hide those that don't match, and show those that do.
Really, it's all up to what you want to do from there, but I personally would just go for the Jquery approach

angular best practice for select show options when other select changes

i'm trying to build a select box that trigger show on options of other select in angular way.
the json that i use build select boxs is
[
{"item_id":1,"item":"rubber","type":"x","facility":"school a"},
{"item_id":2,"item":"pen","type":"x","facility":"school b"},
{"item_id":3,"item":"book","type":"y","facility":"school b"},
]
what i need is 3 select boxes, first one shows all unique type. in above json that would be 'x,y'.
when user select one of them, then it should show all unqiue facility values in other selectbox that has same type as selected.
--if user selected x, then it would show school a and school b
when user select facility, a 3rd selectbox show all uiqiue item as label, and item_id as value where facility = selected facility
<select ng-model="selected.type">
<!-- need to show unique types here -->
</select>
<select ng-model="selected.facility">
<option ng-repeat="s in json" ng-if='selected.type == s.type'>{{s.item}}</option>
</select>
<select ng-model="selected.item">
<option ng-repeat="s in json" ng-if='selected.facility == s.facility'>{{s.item}}</option>
</select>
Current solution
currently what i'm doing is that i wrote a filter
.filter('unique', function() {
return function (arr, field) {
var r = [],final=[];
for(i in arr){
if(r.indexOf(arr[i][field]) == -1){
r.push(arr[i][field]);
final.push(arr[i]);
}
}
return final;
};
})
and doing
<select class="form-control" ng-model="nrequest.facility">
<option ng-repeat="s in facility_services |unique:'facility'" value="{{s.facility}}">{{s.facility}}</option>
</select>
<select class="form-control" ng-model="nrequest.item">
<option ng-repeat="s in facility_services" ng-if='s.facility == nrequest.facility'>{{s.item}}</option>
</select>
it works yet i'm not sure if this is correct way to do it angular way, since i'm still learning this new toy i was hoping for some directions on how to achieve this using ngoptions, or other angularjs best practice

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