I made this script:
var a = $(this).find('.q').val();
I'm trying to find the value for every .q input, but I seem to have got someting wrong. Can anyone explain to me what's wrong?
Update: I have multiple .q elements.
It sounds like you want to receive a list/array, like this:
["foo", "bar"]
where "foo" and "bar" are each values of .q elements.
If I'm right, here's what you want:
var listOfValues = $(this).find('.q').map(function() {
return $(this).val();
});
listOfValues will contain an array-like list of all values of each .q element. This is all thanks to the map function. More information here: http://api.jquery.com/map/
Pass each element in the current matched set through a function, producing a new jQuery object containing the return values.
As you have multiple .q elements you need to loop over them:
$(this).find('.q').each(function() {
var val = $(this).val();
// do something with the value here...
});
Related
Hi suppose I have a jQuery selector such as this:
var a = $(this);
var b = a.nextUntil("button").text();
This will retrieve all the DOM elements till the next button. I want to access all these DOM elements individually as separate objects. Is there way to do that?
If you want to execute a function for each of the elements, you can use .each
If you want all the objects to be in an array, you can do something like this:
var arr = a.nextUntil("button")
and then index it as an array.
console.log($(a[0]).text())
I am trying to figure out how to retrieve the values of a json of which i do not know the number of elements.
Example:
my json can be something like
var json = ["fixelement1":"value1","fixelement2":"value2","fixelement3":"value3","variableelement4":"value4","variableelement5":"value5"]
or
var json =["fixelement1":"value1","fixelement2":"value2","fixelement3":"value3","variableelement7":"value7","variableelement8":"value8", "variableelementN":"valueN"]
the only thing that I know is that the first 3 elements are always the same.
I use .indexOf() to search a value in fixelement3. What I would like to do is, if I find the element, I would like to retrieve the name of all the following elements (which number is variable and that are unknown) and their values.
javascript or jquery would work for me, but I have no idea..
thank you in advance!
var json ={
"fixelement1":"value1",
"fixelement2":"value2",
"fixelement3":"value3",
"variableelement7":"value7",
"variableelement8":"value8",
"variableelementN":"valueN"
}
for(prop in json){
console.log('key ======> value', prop, '=====>', json[prop]);
}
$.getJSON('./file-read?filename='+filename+'¶meter='+parameter, function(data) {
var firstElement = data[0][0];
var lastElement = ?
});
I try to find out the last Element in my JSON file.
My JSON File looks like this:
[[1392418800000,6.9],[1392419400000,7],[1392420000000,7.1],[1392420600000,7.2],[1392421200000,7.2]]
can anybody help me to read extract the last date(1392421200000) ?
Just pick the (length - 1)th element with this:
var lastElement = data[data.length-1][0];
Another way is to use array methods, e.g. pop which will return the last element of the array:
var lastElement = data.pop()[0];
N.B.: The first approach is the fastest way of picking the last element, however the second approach will implicitly remove the last element from data array. So if you plan to use the initial array later in your code, be sure to use either the first method or alternative solution provided by #matewka.
VisioN's answer is nice and easy. Here's another approach:
var lastElement = data.slice(-1)[0];
// output: [1392421200000,7.2]
Negative number in the slice method makes the slice count from the end of the array. I find this method more compact and simpler but the disadvantage is that it returns a smaller, 1-element array instead of the element you wanted to fetch. If you want to fetch only the timestamp you'd have to add another [0] to the end of the expression, like this:
var lastElement = data.slice(-1)[0][0];
// output: 1392421200000
You can use :
var data = " any json data";
var lastelement = data[ Object.keys(obj).sort().pop() ];
Object.keys (ES5, shimmable) returns an array of the object's keys. We then sort them and grab the last one.
How can I store the result of a function to a variable?
In navigating an object that contains an array, I am looking for one value, value1, once that is found I want to get the value of one of its properties, property1.
The code I am using below is an example and is incorrect.
function loadSets(id){
clworks.containers.find(function(i){
return i.get('property1')===id;
});
}
My intent is to navigate the object below:
clworks.containers
containers[0].property0.id
containers[1].property1.id
I am trying to determine how to find which item in the array has a property value equal to the id used in the function and then store it as a variable.
Simply:
var myVar = loadSets(id);
EDIT
Ok, as much as I understand your question now, your situation is the following:
You have an array containing objects called containers;
You want to iterate through this array, looking for the property id of the property property1 which equals the one specified in the function called loadSets(id);
Once found, store the object with the requested id in a variable.
Am I right?
If so, this should solve your problem:
// This function iterates through your array and returns the object
// with the property id of property1 matching the argument id
function loadSets( id ) {
for(i=0; i < containers.length; i++) {
if( containers[i].property1.id === id )
return containers[i];
}
return false;
}
After this you just need to do what I said in the first answer to your question, triggering it however you want. I put up a quick JSBin for you. Try to put 10, or 20, in the input field and then hitting the find button; it will return the object you are looking for. Try putting any other number, it will return a Not found.
Currently your function, loadSets, isn't actually returning anything and so you cannot store a result from it.
Try:
function loadSets(id){
return Base.containers.find(function(i){
return i.get('entityid')===id;
});
}
And to get a result into a variable:
var result = loadSets(id);
I am refactoring some code where I grab the values inputted into textboxes and use said values for calculations. The problem is rather than using document.getElementByID multiple times I want to loop through each textbox on the page and assigning each value to this object which I will pass to my calculation functions. I would also like to set the property names of this object by looking at the input textbox IDs and using the ID strings for the object property names.
See code below:
$(document).ready(function() {
var calcObj = new Object();
$("input[id^='txt']").each(function(i, val) {
calcObj[i] = this.value;
});
$.each(calcObj, function(i, val) {
// alert(val);
});
});
As you can see when document is ready, object is created. There is a jquery .each loop to go through every input with id that contains txt. I am assigning this.value to object where index is i.
So I want to some how name the properties of this object and assign value so I can reference object property name elsewhere in the code where I pass this object to another function.
Thanks.
As far as I understand, you want:
calcObj[this.id] = this.value;
I don't exactly get what you're asking for, because it seems like you're already doing what I think you're asking.
Right now, you're doing:
calcObj[i] = this.value;
That's no different from assigning it like:
calcObj['foo'] = this.value;
// and later we can access that via
alert( calcObj.foo ); // or calcObj['foo']
You can be dynamic with that as well, like:
calcObj[this.id] = this.value;