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How to mark as selected the default text of multiple textarea on tabindex?

I have few textarea on which I want to get the default text selected when I tabbing upon it.
For a single textarea I've found a script which I adapted to my situation but is not an elegant solution.
How can I shorten it.
<script type="text/javascript">
var textBox1 = document.getElementById("textarea_1");
var textBox2 = document.getElementById("textarea_2");
var textBox3 = document.getElementById("textarea_3");
textBox1.onfocus = function() {
textBox1.select();
// Work around Chrome's little problem
textBox1.onmouseup = function() {
// Prevent further mouseup intervention
textBox1.onmouseup = null;
return false;
};
};
textBox2.onfocus = function() {
textBox2.select();
textBox2.onmouseup = function() {
textBox2.onmouseup = null;
return false;
};
};
textBox3.onfocus = function() {
textBox3.select();
textBox3.onmouseup = function() {
textBox3.onmouseup = null;
return false;
};
};
</script>

You can add a dedicated class name and refactor the code to be more generic using class name as selector an make it work for multiple textareas like this:
// Add the class 'auto-selectable' to the desired <texarea/> elements
var textBoxes = document.getElementByClassName('auto-selectable');
for(var i = 0; i < textBoxes.length; i++) {
var textBox = textBoxes[i];
textBox.select();
// Work around Chrome's little problem
textBox.onmouseup = function() {
// Prevent further mouseup intervention
textBox.onmouseup = null;
return false;
};
}

a small correction to Plamen's answer: Elements not Element
var textBoxes = document.getElementsByClassName('auto-selectable');
instead of:
var textBoxes = document.getElementByClassName('auto-selectable');

Java Script function link combine issue in my case

I have issue in flask project, i need set up two js with one link if both was clicked or checked.
For example my data table do changes if clicked check box or selected from multi select some options.
But need make them both if selected and clicked (can be only selected or only just clicked). But need make and option for both
For make issue more clearly after get checked send value in the python function.
I think problem with url.
My js code.
// MULTISELECT
$('.selectpicker').on('change', function() {
selectedServices = $(this).val();
alert(selectedServices)
var url = '/api/VERSION/DATABALE/get?groupFilter='+ selectedServices
console.log('new URL'+url);
table.ajax.url(url).load();
table.ajax.reload();
});
// CHECK BOX
$('input[name="checkboxGroup1"]').on("click", function(){
console.log("Filter clicked")
var own = false;
var own = false;
// var id = parseInt($(this).val(), 10);
if($('#own').is(":checked")) { var f_own = true;}
else { var f_own = false; }
if($('#research').is(":checked")) { var f_research = true;}
else { var f_research = false; }
var url = '/api/VERSION/DATABALE/get?f_own='+ f_own +'&f_research='+ f_research
console.log('new URL'+url);
table.ajax.url(url).load();
table.ajax.reload();
});
So need somehow combine this js. IF only selected options send this selectedServices if checked checkbox send only values from checkbox js. IF selected or clicked both send both values.
I try combine like this
$('.selectpicker').on('change'); or ('input[name="checkboxGroup1"]').on("click", function(){
selectedServices = $(this).val();
console.log("Filter clicked")
var own = false;
var research = false;
if($('#own').is(":checked")) { var f_own = true;}
else { var f_own = false; }
if($('#research').is(":checked")) { var f_research = true;}
else { var f_research = false; }
alert(selectedServices)
var url = '/api/VERSION/DATABALE/get?groupFilter='+ selectedServices + '&f_own='+ f_own +'&f_research='+ f_research
console.log('new URL'+url);
table.ajax.url(url).load();
table.ajax.reload();
});
I dont getting any error, but it not change date in my datatable too, when i combine my js code
Any idea how to solve it? all help will be appreciated

localStorage clears on refresh, parse & stringify not working

Working on a practice app with localStorage, but the stored data is getting cleared on page refresh. Based on answers to similar questions, I've used JSON.stringify(); on setItem, and JSON.parse(); on getItem, but still no luck. Am I using those methods in the wrong way? For reference, #petType and #petName are input IDs, and #name and #type are ul IDs. Thanks!
var animalArray = [];
var addPet = function(type,name) {
var type = $("#petType").val();
var name = $("#petName").val();
localStorage.setItem("petType", JSON.stringify(type));
localStorage.setItem("petName", JSON.stringify(name));
animalArray.push(type,name);
};
var logPets = function() {
animalArray.forEach( function(element,index) {
//empty array
animalArray.length = 0;
//empty input
$("input").val("");
var storedName = JSON.parse(localStorage.getItem("petName"));
var storedType = JSON.parse(localStorage.getItem("petType"));
//append localStorage values onto ul's
$("#name").append("<li>" + storedName + "</li>");
$("#type").append("<li>" + storedType + "</li>");
});
};
//click listPets button, call logPets function
$("#listPets").on("click", function() {
logPets();
$("#check").html("");
});
//click enter button, call addPet function
$("#enter").on("click", function() {
addPet(petType,petName);
$("#check").append("<i class='fa fa-check' aria-hidden='true'></i>");
});

It appears to clear because you are not loading data from it when the page loads. There are multiple bugs in the code:
It appears that you're only saving the last added pet to localStorage, which would create inconsistent behaviour
Setting animalArray.length to 0 is incorrect
animalArray.push(type, name); is probably not what you want, since it adds 2 items to the array, do something like animalArray.push({type: type, name: name});
logPets can just use the in memory array, since it's identical to the one saved
Fixed code:
var storedArray = localStorage.getItem("animalArray");
var animalArray = [];
if(storedArray) {
animalArray = JSON.parse(storedArray);
}
var addPet = function(type,name) {
var type = $("#petType").val();
var name = $("#petName").val();
animalArray.push({type: type, name: name});
localStorage.setItem("animalArray", JSON.stringify(animalArray));
};
var logPets = function() {
animalArray.forEach( function(element,index) {
//empty input
$("input").val("");
//append localStorage values onto ul's
$("#name").append("<li>" + element.name + "</li>");
$("#type").append("<li>" + element.type + "</li>");
});
};
//click listPets button, call logPets function
$("#listPets").on("click", function() {
logPets();
$("#check").html("");
});
//click enter button, call addPet function
$("#enter").on("click", function() {
addPet(petType,petName);
$("#check").append("<i class='fa fa-check' aria-hidden='true'></i>");
});
A quick fiddle to demo it: https://jsfiddle.net/rhnnvvL0/1/

Dynamic dropdowns filtering options with jquery

I am trying to filter one dropdown from the selection of another in a Rails 4 app with jquery. As of now, I have:
$(document).ready(function(){
$('#task_id').change(function (){
var subtasks = $('#subtask_id').html(); //works
var tasks = $(this).find(:selected).text(); //works
var options = $(subtasks).filter("optgroup[label ='#{task}']").html(); // returns undefined in console.log
if(options != '')
$('#subtask_id').html(options);
else
$('#subtask_id').empty();
});
});
The task list is a regular collection_select and the subtask list is a grouped_collection_select. Both which work as expected. The problem is that even with this code listed above I can't get the correct subtasks to display for the selected task.
NOTE: I also tried var tasks=$(this).find(:selected).val() that return the correct number but the options filtering still didn't work.

Try something like this instead (untested but should work).
$(function () {
var $parent = $('#task_id'),
$child = $('#subtask_id'),
$cloned = $child.clone().css('display', 'none');
function getParentOption() {
return $parent.find('option:selected');
}
function updateChildOptions($options) {
$child.empty();
$child.append($options);
}
$parent.change(function (e) {
var $option = getParentOption();
var label = $option.prop('value'); // could use $option.text() instead for your case
var $options = $cloned.find('optgroup[label="' + label + '"]');
updateChildOptions($options);
});
});

jQuery Call within JavaScript class instances leads to last instance

I have problem with two classes and a jquery call. Unfortunatly if a call a method in one class it thinks it is the other one.
Here in detail:
I am writing a form, where the user can write down two customer numbers in two different input fields. The website will query each customernumber via jQuery AJAX and display details from the customer numbers.
So I wrote a class for not duplicating the code and assigning the behaviour to each input field.
CustomerData = function(settings){
this.name = '';
this.street = '';
this.zipcode ='';
this.town = '';
this.inputField = settings.inputfield;
this.init();
}
CustomerData.prototype.init = function() {
this.associateClassWithUi();
}
//here I assign the class with the inputfield via jQuery
CustomerData.prototype.associateClassWithUi = function() {
_this = this;
console.log("associate " +this.inputField);
$(this.inputField).focus(function() {
console.log(' focus on '+_this.inputField);
});
$(this.inputField).blur(function() {
customerId = $(this).val();
console.log("blur event " + _this.inputField);
if(customerId != ''){
_this.main(customerId);
} else {
_this.setEmpty();
_this.propertiesToUi();
}
});
}
I am defining the classes this way:
var DataCustomer1 = new CustomerData({
inputField: '#customer1'
});
var DataCustomer2 = new CustomerData({
inputField: '#customer2'
});
console.log gives me the following:
associate #customer1
associate #customer2
But clicking on the input fields (#customer1 and #customer2) I always get this
focus on #customer2
focus on #customer2
focus on #customer2
Of course if I change the order of instantiation
var DataCustomer2 = new CustomerData(...);
var DataCustomer1 = new CustomerData(...);
each of them thinks he is customer1
What am I missing?

Use var _this = this; otherwise it is being declared globally and overwritten each time.

When you declare a variable without var then it always becomes global. If you have this HTML:
<ul>
<li id="customer1">Customer 1</li>
<li id="customer2">Customer 2</li>
</ul>
The following code works as expected:
CustomerData = function(settings){
this.inputField = settings.inputField;
this.init();
}
CustomerData.prototype.init = function() {
this.associateClassWithUi();
}
CustomerData.prototype.associateClassWithUi = function() {
var _this = this;
console.log("associate " +this.inputField);
$(this.inputField).click(function() {
console.log('click on '+_this.inputField);
});
}
var DataCustomer1 = new CustomerData({
inputField: '#customer1'
});
var DataCustomer2 = new CustomerData({
inputField: '#customer2'
});
You can find more information about JavaScripts variables here