Develop Reference

Language set up with out loading whole page

Are there any alternate way of below code to set app language? Below code refresh the whole page always that gives bad experience to users.
window.location.search = "sap-language=EN";
This is also one way to achieve.
sap.ui.getCore().getConfiguration().setLanguage("EN");
However, some standard controls after rendered don't change the labels. Let me know if there are any other way that help here because loading whole page doesn't make any sense.

You can use Ajax by getting all the new markup and replacing the existing content by the reloaded content.
It might create some issues with other running scripts like loading images and sliders etc that holds a reference to an element so you have to reinitialize every single script that is running on settimeout() on your page.
Moreover you can use jQuery Localisation plugin

Reliably jumping to named anchor on dynamically generated page?

I have a web page which is dynamically built by the client. It generates dozens of list items each with its own named anchor. The side of the page has a fixed table of contents (TOC) with hyperlinks that point to the named anchors. This allows the user to click a TOC entry a jump to the item.
The trouble I am encountering is that on the initial page load the page is dynamically generated and so it cannot scroll to the item in the initial hash of the URL using the default behavior of a browser. Additionally, when the user switches to a different book the page is completely regenerated with new content and a new starting hash. Same problem: since the hash preexists the content, it doesn't situate itself with the item already in view.
I nearly solved this with JavaScript by awaiting the rendering and then jumping to the hash using scrollIntoView method on the appropriate element.
The next problem is that the stylesheet is not fully applied by the time scrollIntoView is called and so the final position of the item is unknown. I see the unstyled item scroll into view, but once styling is applied the positioning is lost. I put a 1 second setTimeout in place to delay the scrollIntoView call. This works but feels fragile.
Are there reliable techniques for jumping to a named anchor when the content comes after the hash is in place? If I knew when the CSS was done styling content that might help. Alternately, it might be useful to trigger an event once the height of the page stabilizes (thus signaling the finalization of CSS styling).

I had a similar problem, although in my case only the table of contents and named anchors were autogenerated in the onload handler - not the rest of the page content. I solved the initial hash problem by adding the following code to my onload handler after generating the anchors:
if (location.hash)
{
var requested_hash = location.hash.slice(1);
location.hash = '';
location.hash = requested_hash;
}
I had to set the hash to '' before setting it back to the requested name to make the browser respond. This seemed to work in all the browsers I tried (Opera, Chrome, Edge, IE, FF).

You can use jQuery if you will always know the name of the element you want to set focus to. You can run this after your page has loaded:
$( "#targetElementGoesHere" ).focus();
Edit: To scroll to that, check out https://github.com/flesler/jquery.scrollTo

I think the answer you require was answered by this guy...
How to wait until a web page is loaded with javascript?
So, something like this...
document.onload = function(){
scrollIntoView...
}

Load an svg object on click instead of loading with the rest of the page

I have a page that open's divs containing svgs embedded using the object tab when a certain a link is clicked, but the svg objects are loaded when the page loads which is going to make the page load very slowly if all the svgs load even though they aren't displayed. I need a javascript function that will cause the svg object to load on click and not to load until then.
I was hesitant in making a new question for this because it seems so simple that I should have been able to find the answer elsewhere. But all the answers to similar questions seem to explain how to show and hide the svg in a div, which is what I already have. I need to delay the loading of the src until a certain onclick event.

Is it more efficient to keep DOM elements on the page or to re-render them as needed?

I have a dialog box that has settings associated with it. When the user clicks the "settings" button, a form is displayed so they can modify them.
What is more efficient:
to have the settings div exist hidden on the page and display when needed
OR
to create the settings div and populate it with data when needed?
In the first scenario you don't need to create the DOM elements and populate them every time, but if there are many dialog boxes open at once (a common situation) then the amount of elements on the page is pretty large and many of them are not going to be used often. But in the second situation, elements are created and appended to the DOM which gets expensive.

I'd suggest you to "cache" your html on the page, but enforce browser to do not render it until necessary (until user request the data, or simply scroll to it). The main idea is to add your html (with data) to the page, but comment it out. For example,
<div id="cached-html">
<!--
<div>
...some custom html here
</div>
-->
</div>
Then once user requested the html, you can do the following:
var html = document.getElementById('cached-html'),
inner = html.innerHTML;
html.innerHTML = inner.substring(4, inner.length - 4);
Pros. is that you don't bother your browser with initial rendering (later you can simply user display:none to hide it again), so your page renders faster.
And another note - if your data (and as a consequence inner html) changes frequently, then it will be better to re-render it each time user request it, but if it is almost static, then hide/show should be more effective.

There can be problems either way, it depends on your page. If you already have a lot of elements on the page, it may be better load add them when you need them. If your page is already very "scripty" you may want to load the elements and show them when needed.
The real question is what would be better for your page, more script, or more dom elements.

When you have to display same setting div at multiple places.
Keeping that hidden is a better solution.
Remember that creating a new dom element or cloning a existing dom element gives almost same performance, but for code clarity/maintainence cloning or template is better.
Implementation using template: Make a template of div setting and keep that hidden:
<div class="template_setting">
Your settings(children of template_setting)
</div>
Javascript/Jquery code:
-Whenever someone opens a dialogue box, make a clone of childrens of template_setting and append to div_dialogue.
-As you may have multiple templates on the same page( which is not always true).
Apply a custom event on the id of newly created setting div.( keep id of each setting div different, you can increment each one by some character/number).
$('#dialogue_opener').click(function(event){
$('.template_setting').children().clone().appendTo(div_dialogue)
.trigger('adjustSettingID');

Consider a hybrid solution. Load the "settings" div after the page is ready. This way, the user won't feel the extra "expense", and you'll have the div ready for when you need it.

I've typically seen that rendering from JavaScript is pretty darn fast. I've built lots of "just in time" menus, grids, and forms and the users can't tell the difference. The nice thing about it is that you don't have to keep a form current, just blow it away and default everything to the data in you settings object. Makes for cleaner code in my opinion.

Manipulate DOM before it is shown to the user?

I'm not too familiar with javascript, is there a way to manipulate the DOM before the page is displayed to the user?
I'm using GWT which makes you create the page elements via javascript. This is kind of convenient, but it appears that all the javascript code is executed after the page is first shown to the user. This has the effect of showing the page as a blank white screen, then all the UI elements popping onto screen. The effect is really apparent when switching between pages.
If I were using php or jsp, it looks like the page ui elements are already prerendered and the browser won't show a blank white screen before display.
So is there any hook in javascript where we can manipulate the DOM before the browser clears out the contents of the last page shown?
-------------------------------- Edit ----------------------------------------
#Cipi: I'm not sure if this will work, but I can try. I think it will be the same problem though? I still see it happening like this:
User is already on one of my pages.
User clicks a link.
Browser starts fetching contents of new url, but the contents are simply an empty html file with just a javascript link in it.
After page is done downloading, browser renders the html (this is just a white screen).
Now the javascript starts executing in response to the onLoad() event(?), building the UI.
A few ms later, the DOM is done being manipulated, and is finally presented to the user.
so I am thinking that your solution would take place on #5, but by then the browser has already rendered the contents of the initial page on step #4?
#Crozin: I'm looking into DOMContentLoaded now, seems specific to gecko based browsers but there are solutions for ie etc. Yeah I basically want to manipulate the dom before the browser renders anything for the new page to screen, hopefully that can do it.
Thanks

Yes there are two methods:
Use DOMContentLoaded event
In the following code:
....
<p id="abc">abc</p>
<script type="text/javascript"> CODE HERE </script>
<p id="def">def</p>
Element with id abc is avaiable, but the one with id def ain't.