To be honest, I have never touched Javascript before today. On basic search I have seen a few scripts use the change function but the samples seem very specific (using .indexOf and changing numbers/text boxes doesn't apply here).
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You can ignore the code that's there. essentially what I'm looking for is when 1 (disease) becomes yes, 6 option is changed to patient, and if 6 (poster_type) value = patient then 7 is selected as yes.
If someone could walk me through the change function that'd be fine too.
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Code and explanation below
So, the code says whenever disease dropdown is changed
if its selected value is "1"
change the poster_type dropdown to Patient.
change the patient_exp dropdown to "1"
else
change the poster_type dropdown to Unknown.
change the patient_exp dropdown to "0"
$("select[name='disease']").change(function(){
if($("select[name='disease']").val() == "1"){
$("select[name='poster_type']").val("Patient");
$("select[name='patient_exp']").val("1");
}
else
{
$("select[name='poster_type']").val("Unknown");
$("select[name='patient_exp']").val("0");
}
});
For change in value of poster_type dropdown,
if current selected value in poster_type is Patient
set value of patient_exp dropdown to "1"
else
set value of patient_exp dropdown to "0"
$("select[name='poster_type']").change(function(){
if($("select[name='poster_type']").val() == "Patient")
{
$("select[name='patient_exp']").val("1");
}
else
{
$("select[name='patient_exp']").val("0");
}
});
Basically you need to bind to the change event:
$('select[name=disease]').on('change', function(e){
// here the user have changed the value
});
Then you can get current value with val():
$('select[name=disease]').val();
// yes or no
Val is also the method you use to change an input value:
$('input[name=myInput]').val('newVal');
So you're looking for something like this:
$('select[name=disease]').on('change', function(e){
if($('select[name=disease]').val() === 'yes'){
$('input[name=myInput]').val('my-new-value');
}
});
Related
I wanna to try to researching around on how to achieve this but I am not sure about how to make the solution for this.
Basically I have a form that contains some select list, radio buttons, and checkboxes. Each option on the form has a corresponding numeric value that will be accumulated and displayed to the user when the form gets submitted.
What I am not sure about is how to be able to add or deduct a value if the user chooses to change the a choice on the form.
For example, when a user is on the first dropdown element, and they choose option 2 which has a value of 5 then the current accummulated value us 5. Then on question 2, they choose option 1 which has a value of 2 which makes the accummulated value 7. Then the user changes the answer for question one from option 2 to option one which means 5 will be deducted from the accumulated value and 2 will be added since it is the value for option 1 which changes the accumulated value to 4.
I know the description I mentioned might be all over the place but I hope it makes sense.
I am trying to use jQuery and so far, my approach would be to check if any of the form element's value has changed:
(function($) {
var score = 0;
$(".the-form #step-5 :input").change(function() {
console.log($(this).val());
});
})(jQuery);
But I can't seem to figure out how to get the previous value of the option that was selected if the user changes their answer.
Any suggestion would be appreciated.
Can you recalculate across the whole form each time the user changes any of the elements?
$(".the-form :input").change(calculateChanges);
function calculateChanges() {
// Retrieve the current values of all elements and add them together
}
When a user submits, then start doing the calculations or when a select is changed, i.e. attach it to the event. Score is now a local variable
function calcValue() {
var score = 0;
//select all the elements using example below
$(".the-form :input").each(function( index ) {
//i forgot jQuery exact syntax but $(this).val or //$(this).val()
score += $( this ).val();
});
console.log(score);
}
In this case you can attach it to the submit
function submit() {
var score = calcValue();
}
Or you can put it in a change event of a select
function selectChanged() {
var score = calcValue();
}
I have provided a user with an interface where they can select from 30 options(hardcoded), displayed in a bootstrap dualListBox.
This works perfectly however I would like to set the max amount of options that can be selected to 10.
After which, all the options that could have been selected on the left side, become disabled.
Should the user remove a selected option, the others can then become available for selection again.
I realize that I will be using jquery to achive this, however I am unsure as to how I will count the amount selected and how I will target remaining selections to disable or make them available again.
Is there any advice on how to correctly solve this problem?
The plugin I am using for the dual listbox can be found here:
Bootstrap dualListBox
First I would bind a change event, then I would check if the number of selected items is equal or exceeds then max number of elements, if so I will disable it.
If I understand your question correct it would be something like:
$('#selector-id').on('change', function(e){
var selectedElements = $(this).val();
if(selectedElements && selectedElements.length >= 10){
$(this).prop('disabled', true);
} else {
$(this).prop('disabled', false);
}
});
(This is not tested code)
please I have a drop down list like
creation
creation from scratch
creation without data
creation pay
modification
modification/specific
modification/clean
and this script
function checkTicketType(tipo) {
console.log("Tipo cambia: "+tipo);
if (tipo.indexOf('Creation')>-1) {
$('#itemId').parent().show(500);
}
else if (tipo.indexOf('Modification')>-1) {
$('#itemId').parent().hide(500);
}
}
When the creation status are selected the itemId box appear, desappear when the modifications are selected.
My problem I want to use the itemId (it can appear only if the status "modification/specific" is selected no more).
Thank you in advance.
Attach change event to select dropdown. Check for selected text on change event.
If it contains modification hide the itemId box (assuming its text input) else if it contains creation show it.
//Change event for dropdown with id ddForEg
$("#ddForEg").change(function(){
if($("#ddForEg option:selected").text().includes('modification'))
{
alert($("#ddForEg option:selected").text());
$('#itemId').hide();
alert($("#ddForEg").val()); //Another way to see value selected. If you assign value to options. No string operations required in that case.
}
else if($("#ddForEg option:selected").text().includes('creation'))
{
$('#itemId').show();
}
})
Fiddle: https://jsfiddle.net/mwoavoqd/
I have a top level select box that when a user makes a selection here, I want this value to be used for all the below select boxes relating to this top level box.
The problem I am having is that, if any one of the lower select boxes is disabled, I want the above process to ignore this select box as it has already been assigned a value.
Obviously, if the lower select box is enabled then I want to assign the top select value to it.
To disable the select list based on a particular value, I have used:
$("select[name=f03]").eq(index).attr('disabled', 'disabled');
Here is the jQuery that I have used but is not working:
var top_select = $("select[name=f07]").val();
$("select[name=f03]").each(function(index){
if $("select[name=f03]").eq(index).is(':enabled'){
$("select[name=f03]").eq(index).val(top_select);
}
});
From this code, it is the lower selects ([name=f03]) that I am trying to set only when it is enabled.
First I would disable select like this:
$("select[name=f03]").eq(index).prop('disabled', true);
Second, your function should be much simpler:
$("select[name=f03]").each(function(){
if ($(this).prop('disabled')) return;
$(this).val(top_select);
});
you should use jquery :enabled selector as follow
$("select[name=f03]:enabled").each(function(){
//execution
});
or
$("select[name=f03]:enabled").val("value");
here is jsfiddle example http://jsfiddle.net/kso2oqr5/1/
When you are disabling elements use .prop(property,value)
var top_select = $("select[name=f07]").val();
$('select[name="f03"]').val(function(){
if(!this.disabled){
return top_select;
}
});
DEMO
I have a dropdown select list on my page of class="TypeFilter".
I have a jQuery event that fires when a value in that list is selected.
$(".TypeFilter").change(function()
{
// Extract value from TypeFilter and update page accordingly
));
I now have to add another list to the page, and I want to implement functionality which will prevent the .change(function() from running unless both are selected.
In both lists the first option in the list is some text instructing the user to select one of the items, so I was thinking of just writing some logic to test that both lists have a selected index greater than 0.
I think this is a touch unclean though, especially considering that other pages that have a TypeFilter use the same logic.
Is there any nifty functionality in jQuery that can do this?
edit I should specify that the user needs to be able to update the page by selecting either dropdown, so I can't put the onchange on the second element and test that the first element has a selected value, as suggested in one of the answers
If you bind the same event to all dropdowns, you can get a collection of all the dropdowns and check that all of them are selected. Example:
$('.Dropdown').change(function(){
var elements = $('.Dropdown');
if (
elements.filter(function(){
return this.selectedIndex > 0;
}).length == elements.length
) {
// all dropdowns are selected
}
});
As you partly mention, put the onchange on the second element and test that the first element has a selected value before you fire off any logic.
Use bind instead, and as the eventdata, send a function that checks that either that both are selected or that the other is selected. Untested code:
function checker() {
// test your conditions
}
$(".TypeFilter").bind('change', {test: checker}, function(event)
{
if (event.data.test && event.data.test()) {
// Extract value from TypeFilter and update page accordingly
}
));
This way the other pages that use the same function will not notice any changes.