I'm trying to move a link around but when I try to include it within a string it doesn't work. If I remove the string it does though. Why is this happening and how do I fix it?
$(document).ready(function(){
var link = $('a');
//Remove the '<div>'s and it works...
$('div').after('<div>'+link+'</div>');
});
See pen for an example: http://cdpn.io/AKnsL
Thanks.
ED: I probably should of noted that this is a simplified version of what I am trying to do, I'm trying to rebuild a menu (don't ask why...) and I have each link assigned to a variable which is then added in place to a rather long string of divs and such, which is all then added in "after" another div. I only mention in case it changes the way this could be done, and I should mention I'm no JS pro :)
Thanks#2!
The issue is because a jQuery selector, such as $('a') returns an object, and appending a string and an object results in what you've seen.
If you want to move the link to a different element in the DOM, use append():
var link = $('a');
$('div').append(link);
$("a") is actually an object, not a string. If you use $("div").after(link), jQuery will work out that you actually want to append the DOM element.
The problem comes in when you do '<div>' + link + '</div>', where JavaScript is creating the string before jQuery gets involved. this is where [object Object] comes from - this is JavaScript's way of creating a sensible String value for an object. What's being evaluated is $("div").after("<div>[object Object]</div>");
You can get around this by first creating your new div, appending the a to that, then appending your new div to the original.
$(document).ready(function() {
var link = $("a"),
new_div = $("<div />").append(link);
$("div").after(new_div);
});
You could use:
$('div').after('<div/>',{html:link});
Try:
div.innerHTML=""+$('a').attr("href").toString()+"";
or:
var str="";
str+=""+$('a').attr("href").toString()+""; // str will contain links href in it
That will append text to div as a string with its href as text to be appended.
Related
Lets say I have an empty div:
<div id='myDiv'></div>
Is this:
$('#myDiv').html("<div id='mySecondDiv'></div>");
The same as:
var mySecondDiv=$("<div id='mySecondDiv'></div>");
$('#myDiv').append(mySecondDiv);
Whenever you pass a string of HTML to any of jQuery's methods, this is what happens:
A temporary element is created, let's call it x. x's innerHTML is set to the string of HTML that you've passed. Then jQuery will transfer each of the produced nodes (that is, x's childNodes) over to a newly created document fragment, which it will then cache for next time. It will then return the fragment's childNodes as a fresh DOM collection.
Note that it's actually a lot more complicated than that, as jQuery does a bunch of cross-browser checks and various other optimisations. E.g. if you pass just <div></div> to jQuery(), jQuery will take a shortcut and simply do document.createElement('div').
EDIT: To see the sheer quantity of checks that jQuery performs, have a look here, here and here.
innerHTML is generally the faster approach, although don't let that govern what you do all the time. jQuery's approach isn't quite as simple as element.innerHTML = ... -- as I mentioned, there are a bunch of checks and optimisations occurring.
The correct technique depends heavily on the situation. If you want to create a large number of identical elements, then the last thing you want to do is create a massive loop, creating a new jQuery object on every iteration. E.g. the quickest way to create 100 divs with jQuery:
jQuery(Array(101).join('<div></div>'));
There are also issues of readability and maintenance to take into account.
This:
$('<div id="' + someID + '" class="foobar">' + content + '</div>');
... is a lot harder to maintain than this:
$('<div/>', {
id: someID,
className: 'foobar',
html: content
});
They are not the same. The first one replaces the HTML without creating another jQuery object first. The second creates an additional jQuery wrapper for the second div, then appends it to the first.
One jQuery Wrapper (per example):
$("#myDiv").html('<div id="mySecondDiv"></div>');
$("#myDiv").append('<div id="mySecondDiv"></div>');
Two jQuery Wrappers (per example):
var mySecondDiv=$('<div id="mySecondDiv"></div>');
$('#myDiv').html(mySecondDiv);
var mySecondDiv=$('<div id="mySecondDiv"></div>');
$('#myDiv').append(mySecondDiv);
You have a few different use cases going on. If you want to replace the content, .html is a great call since its the equivalent of innerHTML = "...". However, if you just want to append content, the extra $() wrapper set is unneeded.
Only use two wrappers if you need to manipulate the added div later on. Even in that case, you still might only need to use one:
var mySecondDiv = $("<div id='mySecondDiv'></div>").appendTo("#myDiv");
// other code here
mySecondDiv.hide();
if by .add you mean .append, then the result is the same if #myDiv is empty.
is the performance the same? dont know.
.html(x) ends up doing the same thing as .empty().append(x)
Well, .html() uses .innerHTML which is faster than DOM creation.
.html() will replace everything.
.append() will just append at the end.
You can get the second method to achieve the same effect by:
var mySecondDiv = $('<div></div>');
$(mySecondDiv).find('div').attr('id', 'mySecondDiv');
$('#myDiv').append(mySecondDiv);
Luca mentioned that html() just inserts hte HTML which results in faster performance.
In some occassions though, you would opt for the second option, consider:
// Clumsy string concat, error prone
$('#myDiv').html("<div style='width:'" + myWidth + "'px'>Lorem ipsum</div>");
// Isn't this a lot cleaner? (though longer)
var newDiv = $('<div></div>');
$(newDiv).find('div').css('width', myWidth);
$('#myDiv').append(newDiv);
Other than the given answers, in the case that you have something like this:
<div id="test">
<input type="file" name="file0" onchange="changed()">
</div>
<script type="text/javascript">
var isAllowed = true;
function changed()
{
if (isAllowed)
{
var tmpHTML = $('#test').html();
tmpHTML += "<input type=\"file\" name=\"file1\" onchange=\"changed()\">";
$('#test').html(tmpHTML);
isAllowed = false;
}
}
</script>
meaning that you want to automatically add one more file upload if any files were uploaded, the mentioned code will not work, because after the file is uploaded, the first file-upload element will be recreated and therefore the uploaded file will be wiped from it. You should use .append() instead:
function changed()
{
if (isAllowed)
{
var tmpHTML = "<input type=\"file\" name=\"file1\" onchange=\"changed()\">";
$('#test').append(tmpHTML);
isAllowed = false;
}
}
This has happened to me . Jquery version : 3.3.
If you are looping through a list of objects, and want to add each object as a child of some parent dom element, then .html and .append will behave very different. .html will end up adding only the last object to the parent element, whereas .append will add all the list objects as children of the parent element.
Am newbie to regex am trying to do some regex replace function in java script here is my content and code
jQuery("td[headers='name_head']").each(function (index, value) {
var text = jQuery(this).html();
if( text.indexOf('<a href=') >= 0){
jQuery(this).text(text.replace(/<a href=.*\"$/, ""));
}
});
Html content will be look like this
Calculate Points
i just want to remove only the value inside href ""
Please throw some light on this
Regards
Sathish
The text() method just retrieves the text contents which doesn't include any HTML tags. You can use html() method with a callback function where you can get the old HTML content as the second argument to the callback and based on the old value generate updated HTML.
The better way is to update the href attribute value of a tag to empty by directly selecting them, there is no need to loop over them since all values need to be empty.
jQuery("td[headers='name_head'] a").attr('href', '');
UPDATE 1 : In case you want to iterate and do some operation based on condition then do something like this.
jQuery("td[headers='name_head'] a").each(function(){
if(//your ondition){
$(this).attr('href', '');
}
});
or
jQuery("td[headers='name_head']").each(function(){
if(//your ondition){
$('a', this).attr('href', '');
}
});
UPDATE 2 : If you want to remove the entire attribute then use removeAttr('href') method which removes the entire attribute itself.
jQuery("td[headers='name_head'] a").removeAttr('href');
Why would you reinvent the wheel?
You don't need regex to achieve this, you can simply do it this way:
jQuery("td[headers='name_head'] a").attr('href', '');
It will set href to "" for all <a> elements inside td[headers='name_head'] so it will always respect your condition.
I haven't tested this code; but something like this should help, don't think you need to use regex for this;
$('a.DisableItemLink[href!=''][href]').each(function(){
var href = $(this).attr('href');
// do something with href
})
This piece of code selects all elements which have the class DisableItemLink with a location set and sets it to blank.
I am curious as to what you are trying to do in the larger scheme of things though, sounds like there might be better ways to go about it.
Reference: some good selector combinations for links
What I want to do is replace what is in between two HTML tags.
I'm using this as a reference but I'm still encountering problems:
REFERENCE
This is what I've tried:
el.getValue().replace(/<form.+<\/form>/, "<div></div>");
I need to replace all my form tags dynamically.
If you use jQuery, just retrieve the parent element of what you'd like to be replaced, and replace the content with the .html() function.
Ex:
var formParentElement = $('#formParentElement');
formParentElement.html("<div>my new content</div>");
If you don't use jQuery:
var formParentElement = document.getElementById("formParentElement");
formParentElement.innerHTML = "<div>my new content</div>";
The example assumes the parent element of your form has an ID with value "formParentElement".
Yeah. I found a solution.
el.getValue().replace(/<form[\s\S]*?<\/form>/, "<div></div>");
Explanation by #[James G]:
[\s\S]*? means [any character including space and line breaks]any number of times, and the ? makes the asterisk "not greedy," so it will stop (more quickly) when it finds </form>.
Reference
I'm using a widget (Purechat) that allows customers and operators to communicate to each other. I've ran into an issue where anchors' href values inside this widget are being appended with "http://%20", thus making them unclickable to our users. We are investigating the code, however, I would like a quick fix for this by replacing all href contents that contain "http://%20" and replace that portion of the href with an empty string so my anchors work.
What would be the best way to go about this?
$('a').attr('href', function(index, value) {
return value.replace("//%20", "");
});
You can run a foreach jquery function which runs over every anchor whose href starts with that string, then cut it with substring method and set it's href value again.
This should work:
$("a[href^='http://%20']").each(function(){
var oldHref = $(this).attr('href');
var newHref = oldHref.substring(10, oldHref.length);
$(this).attr('href',newHref);
});
Via ajax i retrieve some json data, make it as html and append it to my page.
Here I have a problem. I cant access element by id, if id is variable.
For example, http://jsfiddle.net/f8g5e/1/
<div id="123">Hello</div>
<div id="321">Bye</div>
<div id="out"></div>
$(function(){
key = '123';
$('#' + key).hide();
$('#321').hide();
});
The simples thing is works! #123 and #321 elements are hidden. Yeah, it's pretty obviosly.
But, in my project, when I append data to page:
$('#123') //returns element
$('#' + key) //returns null
Some code:
// generating data
var htmlData = '<div id="123">Greetings!</div><div id="321">Bye bye</div>';
// appending data
$('#tweets').empty();
$('#tweets').append(htmlData);
What are the possible causes i can't access elements?
Thanks.
UPDATE
Dont know how it works in JSFiddle, but when I changed my IDs to properly names it began to work now. Thanks to all! Next time, I'll take more attention to w3c dom standarts ;) Happy New Year!
The only reason I can think of that $('#'+key) wouldn't work is because the variable key is undefined.
Note: you're not supposed to start an ID with a number according to the W3C spec. However, most browsers allow it, so I doubt this is causing your problem.
However, if you have two divs with the same ID attribute, then JavaScript will only select the first one it finds -- IDs are supposed to be unique. If this is happening, use classes instead.
You can either do this:
$(function() {
$('#321,#123').hide();
});
or you can do this:
$(function() {
var key = '123';
var doit = '321';
$('#' + key + ',#' + doit).hide();
});