I'm trying to get the value of a dropdown's option (there is an id on the select markup), when opening the web page
Using
$(document).ready(function() {
$('#cat_list').ready(function(){
var category = $(this).val();
alert(category);
});
});
I get a blank alert.
But Using .change (when selecting something else inside the dropdown) the following code works perfectly with the same function
$(document).ready(function() {
$('#cat_list').change(function(){
var category = $(this).val();
alert(category);
});
});
Finally, this works using basic javascript and it gets successfully the values on open, refresh, on form submit fail, ... etc
$(document).ready(function() {
$('#cat_list').ready(function(){
var e = document.getElementById("cat_list");
var category = e.options[e.selectedIndex].value;
alert(category);
});
});
Thanks for any help on why the first version .ready + $(this).val(); fails
Correct code is:
$(document).ready(function () {
var category = $('#cat_list').val();
alert(category);
});
$(document).ready itself means the whole document (including #cat_list) is ready to be processed. why are you checking if an element is ready or not!!??
you can directly use the value of the element like
$('#cat_list').val();
The documentation says that .ready:
Specify a function to execute when the DOM is fully loaded.
And 3 possible usage cases are:
$(document).ready(handler)
$().ready(handler) (this is not recommended)
$(handler)
However you can actually assign .ready to any element and it will be triggered:
$('#cat_list').ready(function(){
});
This code is fired. BUT this inside .ready function always refers to document.
It will work this way:
$(document).ready(function() {
$('#cat_list').ready(function(){
var category = $('#cat_list').val();
alert(category);
});
});
But actually your code is overengineered:
$(document).ready(function() {
var category = $('#cat_list').val();
alert(category);
});
Related
I am still new to JavaScript and jQuery, so I am confused as to why the following code is not working as I anticipated. All I am trying to do is save input on a button click (id=recordInput) and display it with another button click (id=displayInput). What I observe is that tempInput is stored, (the code works until that point) but assignment of displayInputs onclick attribute is not executed. My question is, can you not nest a $().click() call inside of another &().click() call?
<script>
$(document).ready(function () {
$('#recordInput').click(function(event) {
var tempInput = $('#testInput').val();
&('#displayInput').click(function(event) {
console.log(tempInput);
});
});
});
</script>
My thinking is this in pseudocode:
assign recordInput onclick attribute to the following function:
store tempInput
set displayInput onclick to alert the tempInput value
what is wrong with my thinking?
NOTE: I did not include any html tags but all of the ids are referenced correctly
It's not working because you have put & instead of $ here
$('#displayInput').click(function(event) {
Fixing this may work, but you shouldn't set event handlers this way. Because every time your first handler function is called it will set an event handler for the second one. You can try with your console.log and you will see that the number of console.log is increasing by every click on #recordInput. So you should better set it like this :
var tempInput;
$('#recordInput').click(function(event) {
tempInput = $('#testInput').val();
});
$('#displayInput').click(function(event) {
console.log(tempInput);
});
I would change
$(document).ready(function () {
$('#recordInput').click(function(event) {
var tempInput = $('#testInput').val();
&('#displayInput').click(function(event) {
console.log(tempInput);
});
});
});
to
$(function(){
var testInput = '';
$('#recordInput').click(function(){
testInput = $('#testInput').val();
});
$('#displayInput').click(function(){
if(testInput !== ''){
console.log(testInput);
}
});
});
You are using & instead of $. Of course, you don't have to format the code exactly like I did.
I keep getting an uncaught syntex error which I know usually means your code has a missing closing something. I keep failing to see what it is that I am missing.
The idea of the function is that it extracts the a links ID and Text content and add's it to an un-ordered list.
The links have a class of 'ingredient_add' and the unordered list has an ID of 'ingredientsAdded'.
I can't see what I've missed here.
$(document).ready(function() {
$('.ingredient_add').click(function() {
event.preventDefault();
var id = this.id;
var value = this.text();
$('#ingredientsAdded').append("<li id='"+id+"'>"+value+"</li>");
}); //end add to list
}); // end document ready()
The error you should be getting is Uncaught TypeError: undefined is not a function
$('.ingredient_add').click(function () {
event.preventDefault(); <-- what is event?
should be
$('.ingredient_add').click(function (event) {
event.preventDefault();
if you are still getting that error, there is something else going on that is not in your code.
Your syntax looks good. You do need to pass in the event to the function though.
$('.ingredient_add').click(function(event){
event.preventDefault();
Check out Jonathan Lonowskis comment on your .text().
Hello your problem was just a simple mistake.
var value = $(this).text();
Here is a jsfiddle: http://jsfiddle.net/Grimbode/pFLXf/1/
I updated your code. Watch out not to use the same id more than once.
$(document).ready(function(){
var counter = 0;
$('.ingredient_add').click(function(event){
event.preventDefault();
var id = this.id;
var value = $(this).text();
$('#ingredientsAdded').append('<li id="'+id+counter+'">'+value+'</li>');
counter+=1;
}); //end add to list
}); // end document ready()
You missed an argument in click handler function.
$(document).ready(function(){
$('.ingredient_add').click(function(event){
event.preventDefault();
var id = this.id;
var value = this.text();
$('#ingredientsAdded').append("<li id='"+id+"'>"+value+"</li>");
}); //end add to list
}); // end document ready()
I am developing web app, I have such a requirement that whenever user click on text inside span i need convert it into input field and on blur i need to convert it back to span again. So i am using following script in one of my jsp page.
Java Script:
<script type="text/javascript">
function covertSpan(id){
$('#'+id).click(function() {
var input = $("<input>", { val: $(this).text(),
type: "text" });
$(this).replaceWith(input);
input.select();
});
$('input').live('blur', function () {
var span=$("<span>", {text:$(this).val()});
$(this).replaceWith(span);
});
}
JSP Code:
<span id="loadNumId" onmouseover="javascript:covertSpan(this.id);">5566</span>
Now my problem is, everything works fine only for the first time. I mean whenever i click on the text inside span for the first time it converts into input field and again onblur it coverts back from input field to normal text. But if try once again to do so it won't work. Whats wrong with above script?
Would be good to change your dom structure to something like this (note that the span and the input are side by side and within a shared parent .inputSwitch
<div class="inputSwitch">
First Name: <span>John</span><input />
</div>
<div class="inputSwitch">
Last Name: <span>Doe</span><input />
</div>
Then we can do our JS like this, it will support selecting all on focus and tabbing to get to the next/previous span/input: http://jsfiddle.net/x33gz6z9/
var $inputSwitches = $(".inputSwitch"),
$inputs = $inputSwitches.find("input"),
$spans = $inputSwitches.find("span");
$spans.on("click", function() {
var $this = $(this);
$this.hide().siblings("input").show().focus().select();
}).each( function() {
var $this = $(this);
$this.text($this.siblings("input").val());
});
$inputs.on("blur", function() {
var $this = $(this);
$this.hide().siblings("span").text($this.val()).show();
}).on('keydown', function(e) {
if (e.which == 9) {
e.preventDefault();
if (e.shiftKey) {
$(this).blur().parent().prevAll($inputSwitches).first().find($spans).click();
} else {
$(this).blur().parent().nextAll($inputSwitches).first().find($spans).click();
}
}
}).hide();
I understand you think that element replacement is a nice thing, however, I would use a prompt to get the text. Why? It is a lot easier and actually a bit prettier for the user as well. If you are curious on how to do it, I show you.
html:
<span class='editable'>foobar</span>
js:
$(function()
{
$('span.editable').click(function()
{
var span = $(this);
var text = span.text();
var new_text = prompt("Change value", text);
if (new_text != null)
span.text(new_text);
});
});
http://jsfiddle.net/qJxhV/1/
First, you need to change your click handler to use live() as well. You should take note, though, that live() has been deprecated for quite a while now. You should be using on() in both cases instead.
Secondly, when you replace the input with the span, you don't give the element an id. Therefore, the element no longer matches the selector for your click handler.
Personally, I would take a different (and simpler) approach completely. I would have both the span and in the input in my markup side by side. One would be hidden while the other is shown. This would give you less chance to make mistakes when trying to recreate DOM elements and improve performance since you won't constantly be adding/removing elements from the DOM.
A more generic version of smerny's excellent answer with id's can be made by slightly altering two lines:
$input.attr("ID", "loadNum"); becomes $input.attr("ID", $(this).attr("ID")); -- this way, it simply takes the current id, and keeps it, whatever it is.
Similarly,
$span.attr("ID", "loadNum"); becomes $span.attr("ID", $(this).attr("ID"));
This simply allows the functions to be applied to any div. With two similar lines added, both id and class work fine. See example.
I have done little change in code, By using this input type cant be blank, it will back to its real value.
var switchToInput = function () {
var $input = $("<input>", {
val: $(this).text(),
type: "text",
rel : jQuery(this).text(),
});
$input.addClass("loadNum");
$(this).replaceWith($input);
$input.on("blur", switchToSpan);
$input.select();
};
var switchToSpan = function () {
if(jQuery(this).val()){
var $text = jQuery(this).val();
} else {
var $text = jQuery(this).attr('rel');
}
var $span = $("<span>", {
text: $text,
});
$span.addClass("loadNum");
$(this).replaceWith($span);
$span.on("click", switchToInput);
}
$(".loadNum").on("click", switchToInput);
jsFiddle:- https://jsfiddle.net/svsp3wqL/
I want my textArea to resize when the page is fully loaded. I found that
$(document).ready(function() {
// Handler for .ready() called.
});
can help me, so I try to test it and put next code into that function:
$(document).ready(function() {
var element = $('#elementId');
alert(element.value);
});
But when the page is loading, alert shows undefined value of textArea, however there is text inside it.
How can I fetch those value inside ready function?
$(document).ready(function() {
var element = $('#elementId');
alert(element.val());
});
element isn't a DOM element but a jQuery wrapped object, it doesn't have any value property.
Use
$(document).ready(function() {
var element = $('#elementId');
alert(element.val());
});
or
$(document).ready(function() {
var element = document.getElementById('elementId');
alert(element.value);
});
or
$(document).ready(function() {
var element = $('#elementId');
alert(element.get(0).value);
});
You need to use DOM object to use value property and you have jQuery object you need to use val() on it.
$(document).ready(function() {
var element = $('#elementId');
alert(element[0].value);
//or
alert(element.val());
});
I define a tag picker which will generate checkbox inputs based on "group". If I select the tags I want and press done button, it should return a string to set the value of a text input.
Here are the related codes. The problem is it only works well at the first time. For example, for the first time, if I checked 'jquery','javascript' in the tags,
console.log('output is:' + tags);
print out 'output is: jquery,javascript'. Works!
Then I use it again and select 'jquery','javascript','bootstrap',
it will return
output is: jquery,javascript,bootstrap
output is:
One more time for 'jquery','javascript','bootstrap', it returns
output is: jquery,javascript,bootstrap
output is:
output is:
Seems the done button pressed, the function is called repeatedly. Being stuck with it for several hours but can't figure out. Really appreciate for your answer! Thanks
(function(){
$.fn.tagPicker = function(source,options){
var settings = $.extend({
perRow : 3
},options);
$.fn.attachRow = function(row,col){
//codes here
...
}
$.fn.attachPicker = function(){
//codes here
// generate html for checkbox inputs
...
};
var $input = this;
if($('.tag-picker').length == 0){
$input.attachPicker();
$('body').on('click','.tag-picker .close-picker',function(){
$('.tag-picker').remove();
})
$('.tag-picker .close-picker').off();
$('body').on('click','.tag-picker #btn-done', function(){
var tags = getTags();
$('.tag-picker').remove();
console.log('output is:' + tags);
$input.val(tags);
});
}
function getTags(){
var t = [];
$('.tag-picker input').each(function(){
if($(this).is(':checked')) t.push($(this).attr('id'));
})
return t.join(',');
}
}
})(jQuery);
$('body').on('click','input.participant',function(){
$(this).val('');
$(this).tagPicker(group);
})
You are initialising the plugin every time the elements are clicked. You should initialise it once, on DOM ready.
OR if you want to do this anyway; you could use .one() for the event to run only once and remove itself. Use .off() to detach an event, attached with .on().