Hi there Dojo developers, I have a drop down form.select, and it has few options, how do set an option to be selected. Say I want to have the third option displayed in the select element. I was looking at the dojo docs and I do not see setSelected() or similar.
Thanks
You need to use displayedValue property in addition to value to set the displayed option. Use something like:
selector.set("displayedValue", "the_text_of_the_option");
or you can search the underlying store of your drop down by using :
selectorStore.fetch({query:{id: value}, onComplete: function (items) {
dojo.forEach(items, function(item){
selector.set("displayedValue", "the_text_of_the_option");
selector.set("value", "the_value_of_the_option");
});
}});
Hope that helps.
I found it, it is selector.attr("value", "the_name_of_the_option");
Thank you, this is true and working. I have tested it. However i discovered my bug: I was creating the options dynamically, and when I set .selected = true as soon as I add it to the selector it changes the sated to the first one being selected.
Or if I apply selector.set("displayedValue", "the_text_of_the_option");
It displays visually the selected one but in fact behind the selected is still the first one does not meter if I change it with the above selector.set. So I solved it by manually creating the selected state. This way when I add it letter id stays in the desired one and changes it accordingly.
Snipped here:
//populate latitude selector
match = false;
optionsArr = [];
for(var i = 0; i < namesLength; i++){
for(var j = 0, len2 = latNames.length; j < len2; j++){
if(fieldNames[i].toLowerCase() == latNames[j]){
for (var a = 0; a < namesLength; a++) {
var option = {};
option.label = fieldNames[i];
option.value = i+"";
if(i==a){
option.selected = true;
}
optionsArr.push(option);
}
match = true;
}
}
}
if(match){
var drop1 = dijit.byId("selectLatitude");
drop1.addOption(optionsArr);
}else{
var drop1 = dijit.byId("selectLatitude");
drop1.addOption(options);//options is an array of options created originally
}
Related
I am trying to add options to a select drop down list. I am doing this dynamically with js.
When I do this with one select list it works but I need to dynamically add more select list as the user wants to add more sets.
My one list works just fine like this:
<body>
<select class="js-example-basic-single" name="state"></select>
</body>
<script>
$(document).ready(function() {
$('.js-example-basic-single').select2();
});
load_workout_lst({{workout_list | tojson}});
let lst = {{workout_list | tojson}};
let e = document.getElementsByName('state');
console.log(e);
for(var i = 0, l = lst.length; i < l; i++){
var option2 = lst[i];
e[0].options.add(new Option(option2));
}
</script>
I notice when I console.log(e) I get a NodeList. Since I know there is only one item in that list I choose the first one. I access its options and add to it. It works great.
When I add the select menu dynamically I do this:
let exercise = $("#exercise");
var input;
var input = $("<select>").attr("type", "text").attr("name", exerciseName).attr("tabindex", tabIndexNum);
var br = $("<br>");
exercise.append(br);
exercise.append(input);
input.select2();
console.log(input);
for(var i = 0, l = workout_lst.length; i < l; i++){
console.log(workout_lst[i]);
var item = workout_lst[i];
input.options.add(new Option(item));
}
tabIndexNum++;
var workout_lst = [];
function load_workout_lst(lst){
for (let i = 0; i < lst.length; i++){
workout_lst.push(lst[i]);
}
}
Error:
Uncaught TypeError: input.options is undefined
When I console.log(input) here I get an Object. I'm sure that this is my problem I just don't know how to push or add to the Object. Is there a different way I need to be adding to an object? What am I doing wrong here?
I found the official select2 documentation very simple when it comes to managing options. For example, you can use the code snippet below to append and select option. For more details, i have left a reference.
var data = {
id: 1,
text: 'Barn owl'
};
var newOption = new Option(data.text, data.id, true, true);
$('#mySelect2').append(newOption).trigger('change');
Reference:
https://select2.org/programmatic-control/add-select-clear-items
I have the below code, is there a way to put this in a simpler format.
I am having to blank out 50 or more fields when a date in a certain key field is changed or made blank.
if (zEntry ==""){
document.getElementById("Q229I1226").value="";
document.getElementById("DQ230I1227").value="";
document.getElementById("DQ231I1228").value="";
document.getElementById("Q4I1001").value="";
//Date from fall to arrival
document.getElementById("Q232I1229").value="";
document.getElementById("DQ233I1230").value="";
document.getElementById("DQ234I1231").value="";
document.getElementById("Q5I1002").value="";
//Date Time of referral to T&O surgery
document.getElementById("Q238I1235").value="";
document.getElementById("DQ239I1236").value="";
document.getElementById("DQ240I1237").value="";
document.getElementById("Q15I1012").value="";
document.getElementById("Q17I1014").value="";
//Date seen T&O 1st on call
document.getElementById("Q241I1238").value="";
document.getElementById("DQ242I1239").value="";
document.getElementById("DQ243I1240").value="";
document.getElementById("Q16I1013").value="";
}
Thank you
You have to add common class to your inputs.
var array = document.getElementsByClassName('className');
for (var i = 0, lng = array.length; i < lng; i++) {
array[i].value = '';
}
If you want to clear out all fields with same tag you can just use
document.getElementsByTagName(arg) while arg being 'input', 'option' etc.
But if you want specific inputs to be cleared, you have to give them a class and use
document.getElementsByClassName(arg)
Add class to the input fields and try
var array_container = document.getElementsByClassName('example');
for (var i = 0, i < array_container.length; i++) {
array_container[i].value = '';
}
You may try this approach too:
// store all the element ids in an array
var element_ids = ['Q229I1226', 'DQ230I1227', 'DQ231I1228', 'Q4I1001',
'Q232I1229'];
element_ids.forEach(function(element_id){
document.getElementById(element_id).value = '';
});
Here is a solution of how to clear all input boxes/fields by looping.
Loop though all input boxes and clear them
I want to append multiple options in html select.
Currently I'm using the below code in a loop, but it make the working slow as it have to add new option every time.
Code Snippet:
s.options[s.options.length]= new Option(url, '1');
So I guess, if I can add all the options at once and not one by one like above, maybe it can make it little faster.
Please suggest a more fast function then this one. Thanks
Try this,
s.options[s.options.length]=function Option(url,'1') {
// statements go here
};
You may be able to do it with a DocumentFragment but I'm unsure about browser support. It certainly works in current versions of all browsers (including IE 10) but I doubt it works in old IE.
var frag = document.createDocumentFragment();
for (var i = 0; i < 10; ++i) {
var option = document.createElement("option");
option.value = "" + i;
option.text = "Option " + i;
frag.appendChild(option);
}
s.appendChild(frag);
Demo: http://jsfiddle.net/QsNpe/
Try this:
var tmpOptions = [];
for(var i=0; i<optionsLength; i++) {
tmpOptions[i] = new Option(url, i);
}
s.options = tmpOptions;
try this
var dataArr = [{'value':'val1','text':'text1'},
{'value':'val2','text':'text2'},
{'value':'val3','text':'text3'},
{'value':'val4','text':'text4'},
{'value':'val5','text':'text5'},
{'value':'val6','text':'text6'},
{'value':'val7','text':'text7'}];
// Removes all options for the select box
$('#optExample option').remove();
// .each loops through the array
$.each(dataArr, function(i){
$('#optExample').append($("<option></option>")
.attr("value",dataArr[i]['value'])
.text(dataArr[i]['text']));
});
I wonder if it's possible in Javascript to get the currently selected options in a <select multiple> field using the Selctors API rather than a "stupid" iteration over all options.
select.querySelectorAll('option[selected="selected"]') only returns the options that were marked as preselected in the original HTML, which is not what I'm looking for. Any ideas?
document.querySelectorAll('option:checked')
Works even on IE9 ;)
I was also experienced your issue, I have a feeling it's to do with JavaScript not recognising changes in the DOM.
Here is a solution:
jsFiddle
document.getElementById('test').onclick = function () {
var select = document.getElementById('select');
var options = getSelectedOptions(select);
console.log(options);
};
function getSelectedOptions(select) {
var result = [];
var options = select.getElementsByTagName('option');
for (var i = 0; i < options.length; i++) {
if (options[i].selected)
result.push(options[i]);
};
return result;
}
As described in
https://www.w3schools.com/jsref/prop_select_selectedindex.asp
you can get the currently selected index with
selectObject.selectedIndex
It also changes in a change eventListener.
For example:
id_selected = document.querySelector('#sel').selectedIndex;
console.log(document.querySelector('#sel')[id_selected]);
The following code triggers just before a page is loaded. Now I've managed to fill a select with values. But I'm not sure on how to make the first value to be the deafault selected value.
$(document).on('pagebeforeshow', '#searchpage',
//This function is the whole function that runs when the pagebefore event occurs
function () {
//This reads the universities from the api we created
$.getJSON(AddressAccess + "Home/university/format/json",
function (data) {
//The data is sent back in a collection of objects. We need to extract each object and do relative operations
for (var i = 0; i < data.length; i++) {
var university = data[i];
var SelectDropDown = document.getElementById("searchuniversity");
var NewOption = new Option(university.Name, university.UniverstiyID);
if (i == 1) {
SelectDropDown.add(NewOption, Selected);
} else {
SelectDropDown.add(NewOption);
}
};
});
});
Now if i use SelectDropDown.add(NewOption,Selected); Only one option is made as an option in the select and what I want is to just make the first option being read from my json data to be the default option appearing in the select.
Set selectedIndex of SelectDropDown to 1:
if (i == 1) {
SelectDropDown.add(NewOption);
SelectDropDown.selectedIndex = 1;
}
If you're really talking about the very first option from the options list, selectedIndex should be 0. The options array of a select element is zero based.
[edit] based on your comment:
maybe the select already contains a blank option. Try:
if (i < 1) {
SelectDropDown.options.length = 0;
SelectDropDown.add(NewOption);
SelectDropDown.selectedIndex = 0;
}
Just set the defaultSelected property of the element to true:
var newOption = new Option(university.Name, university.UniverstiyID);
newOption.defaultSelected = true;
Or use the parameters of the Option constructor:
var newOption = new Option(university.Name, university.UniverstiyID, true, true);