Here is my code
var input_buttons = ["#one","#two","#three"];
var substr = input_buttons.split(',');
for(var i=0; i< substr.length; i++)
{
substr.attr('value', '');
}
Why doesn't this work?
Your first problem is calling split(',') on an array. However, if you just want to set the values of all those to a blank string you can do:
$('#one,#two,#three').val('');
If you want to set different values you'd need to loop through:
$('#one,#two,#three').each(function() {
// this == the HTML node (not a jQuery element)
this.value = someValue; // someValue would set outside
};
You already have an array, there is nothing to split, this only works on strings. You'd also have to pass the ID to jQuery before you can cal attr. In this case val is even better.
var input_buttons = ["#one","#two","#three"];
for(var i=input_buttons.length; i--;) {
$(input_buttons[i]).val('');
}
But shorter would be using the multiple selector:
$('#one, #two, #three').val('');
or if you already have the array, create a string by joining the IDs:
$(input_buttons.join(',')).val('');
I'm wondering why you are calling:
var substr = input_buttons.split(',');
By the nature of your input_buttons, you already have an array. All you should have to do is:
var input_buttons = ["#one","#two","#three"];
for(var i=0; i< substr.length; i++)
{
$(input_buttons[i]).attr('value', '');
}
var input_buttons = ["#one","#two","#three"];
$.each(input_buttons, function(idx, value) {
$(value).val('');
});
Or even better and shorter:
$('#one, #two, #three').val('');
You could also give those elements a common class name and then use this:
$('.className').val('');
your array contains just the id but not the actual object
try this
var input_buttons = ["#one","#two","#three"];
for(var i=0; i< input_buttons.length; i++)
{
$(input_buttons[i]).removeAttr('value');
}
input_buttons is already an array - don't split it.
To use .attr you need it to be a jquery object, so call $(input_buttons[i]).attr
Try the following to remove an attribute:
var input_buttons = ["#one","#two","#three"];
for(var i=0; i< input_buttons.length; i++)
{
$(input_buttons[i]).removeAttr('value');
}
The reason your code does not work is in the overloading of jQuery functions. .attr('value', '') evaluates to .attr('value'), which returns the value of value as opposed to setting it. The reason is that '' evaluates to false.
Related
I would like to use document.getElementsByTagName('input')
to set as required (or unset it) for a list of inputs.
is it possible?
I've tried:
document.getElementsByTagName('input').required = false;
or (for a different purpose)
document.getElementsByTagName('input').value = ""
but it doesn't seem work.
Moreover: is it possible to catch a certain type of input (i.e. text or radio)?
Thank you!!!
ObOnKen
getElementsByTagName() returns a collection of elements so you need to iterate over the collection...
var elements = document.getElementsByTagName('input');
for(var i = 0; i < elements.length; i++)
{
if(elements[i].type == "text")
{
elements[i].value = "";
}
}
getElementsByTagName() returns a live HTMLCollection. If you want to do something to each item returned, you'll have to explicitly iterate across them:
var inputs = table.getElementsByTagName('input');
for (var i = 0; i < inputs.length; i++) {
inputs[i].required = false;
}
However, if you use some libraries, you may be able to operate on each of the contents of a collection (or, as some of the libraries call them, selection) en-masse with a syntax as you seem to expect.
You should use for loop for iterating all inputs, because document.getElementsByTagName returns a HTMLCollection of elements with the given tag name.
var values = document.getElementsByTagName('input');
for (var i = 0; i < values.length; i++) {
values[i].required = false;
}
To catch a certain type of input:
var textInput = document.querySelector("input[type=text]");
querySelector returns the first element within the document.
I have a array that has IDs in JavaScript:
["1649545","1649546","1649547"] etc.
And I want to print the values of this array in a URL, so something like this the foreach function of PHP does;
foreach
www.google.com/[valueofarray]
end
I know the solution could be very easy, but I just cannot manage to find it.
I made a fiddle and used a for loop this is without the use of jQuery but only javascript. I made an example array called myArray, I used .length so that javascript stops when he's been through all of the strings in the example array.
var myArray = ['12345', '123456', '1234567'];
for (var i = 0; i < myArray.length; i++) {
console.log('http://foo.com/' + myArray[i]);
// alert(myArray[i]);
}
See it work (and be sure to open your browsers console or use alert instead for viewing the output)
jsFiddle
var p='http:',a=["1649545","1649546","1649547"],u='www.google.com';for(i=0; i<a.length; ++i) console.log([p,'',u,a[i]].join('/'));
Try this:
var idArray = ["1649545","1649546","1649547"];
var url = "www.google.com/";
idArray.forEach(function(id){
console.log("http://" + url + id);
});
https://jsfiddle.net/tcmn2Lda/
so I'm looping through a json response and I'm trying to use the counter (var i) to say data.newarray[i].time+i so with each loop the next array is chosen and the time also increases in number. So 1st loop will spit out data.newarray[0].time0 then data.newarray[1].time1 then data.newarray[2].time2 and so on. The bit that is currently failing is my concatenation time+i at the end. How do I format this to work?
var data = JSON.parse(xmlHTTP.responseText);
for(var i=0; i<data.newarray.length; i++)
{
alert(data.newarray[i].time+i);
}
You can access variable property names by using the quoted notation: obj['prop'] instead of obj.prop.
The solution is:
var data = JSON.parse(xmlHTTP.responseText);
for(var i=0; i<data.newarray.length; i++)
{
alert(data.newarray[i]['time'+i]);
}
Try something like this:
for(var i=0; i<data.newarray.length; i++) {
alert(data.newarray[i]['time'+i]);
}
I have an application in which i am storing values in localstorage. By default my first value is null due to which i am getting error to run the code so i want to remove the first element and continue the processes. can anyone please help me how to remove first element from list?
Piece of my code is below:
var str = localStorage.getItem("appidlist");
var mySplitResult = str.split(",");
for(var i = 0; i < mySplitResult.length; i++) {
if (.....) {
.
.
}
}
where str returns null,1,2,3,.....
I hope my question is clear can anybody help me.
This should also work:
var str = localStorage.getItem("appidlist");
var mySplitResult = str.split(",");
mySplitResult.splice(0, 1);
You can use .shift().
mySplitResult.shift()
Instead of uing the shift() function, I would suggest you to create a function that return a new clean array. This will solve even the case where there are more than one (and in any postion) null value.
You can use this solution
This should do the trick:
var str = localStorage.getItem("appidlist");
var mySplitResult = str.split(",").splice(1); // Remove the first item.
for(var i = 0; i < mySplitResult.length; i++) {
// Stuff
}
I have been trying forever but it is just not working, how can I check the array of urls I got (document.getElementsByTagName('a').href;) to see if any of the websites are in another array?
getElementByTagName gives you a nodelist (an array of nodes).
var a = document.getElementsByTagName('a');
for (var idx= 0; idx < a.length; ++idx){
console.log(a[idx].href);
}
I really suggest that you use a frame work for this, like jquery. It makes your life so much easier.
Example with jquery:
$("a").each(function(){
console.log(this.href);
});
var linkcheck = (function(){
if(!Array.indexOf){
Array.prototype.indexOf = function(obj){
for(var i=0; i<this.length; i++){
if(this[i]===obj){
return i;
}
}
return -1;
}
}
var url_pages = [], anchor_nodes = []; // this is where you put the resulting urls
var anchors = document.links; // your anchor collection
var i = anchors.length;
while (i--){
var a = anchors[i];
anchor_nodes.push(a); // push the node object in case that needs to change
url_pages.push(a.href); // push the href attribute to the array of hrefs
}
return {
urlsOnPage: url_pages,
anchorTags: anchor_nodes,
checkDuplicateUrls: function(url_list){
var duplicates = []; // instantiate a blank array
var j = url_list.length;
while(j--){
var x = url_list[j];
if (url_pages.indexOf(x) > -1){ // check the index of each item in the array.
duplicates.push(x); // add it to the list of duplicate urls
}
}
return duplicates; // return the list of duplicates.
},
getAnchorsForUrl: function(url){
return anchor_nodes[url_pages.indexOf(url)];
}
}
})()
// to use it:
var result = linkcheck.checkDuplicateUrls(your_array_of_urls);
This is a fairly straight forward implementation of a pure JavaScript method for achieving what I believe the spec calls for. This also uses closures to give you access to the result set at any time, in case your list of urls changes over time and the new list needs to be checked. I also added the resulting anchor tags as an array, since we are iterating them anyway, so you can change their properties on the fly. And since it might be useful to have there is a convenience method for getting the anchor tag by passing the url (first one in the result set). Per the comments below, included snippet to create indexOf for IE8 and switched document.getElementsByTagName to document.links to get dynamic list of objects.
Using Jquery u can do some thing like this-
$('a').each(function(){
if( urls.indexOf(this.href) !- -1 )
alert('match found - ' + this.href );
})
urls is the your existing array you need to compare with.