Trying to understand how to fit Backbone into this menu - javascript

I'm just learning Backbone-- it seems awesome but I'm still learning how exactly to wield it. I'm trying to figure out how it fits into this situation where I've been asked to use it, and I was hoping for some leads.
Basically we have a menu that's already totally made HTML/CSS wise, it's done. This menu lets a user select what color of product they're looking for (for example), then what fabric, and so on. The functionality they would like to add to this menu is that as soon as the first choice is made, the color, the second set of options should grey out accordingly: for instance, if you pick red and only 2 of the 5 fabrics are available in red, the other 3 should grey out.
They want this done with Backbone, and it's my first time putting this library to use.
So as soon as a color is picked, I guess I need to make an AJAX request and immediately find out what's good for fabrics and update accordingly, but I'm hitting a little wall because if the HTML is already done...then...there's no "view", not that I made anyway...so...help me out here. Am I thinking about it wrong? Can this be done anyway?

What you'd probably do is have a model to manage your options (color, fabric, etc.). Then, when one of the attributes changes, you fetch the updated possibilities from your server. Of course, for this to work, you need to define your model's url function to generate the url corresponding to you endpoint.
When the data returns from the server, you render the view into the form's element, which will replace the HTML already there (in effect updating what is displayed to the user).
Realistically, although your form already is written, you'll probably find it easier to generate the same HTML in your view's render function, and simply rerender the form each time an option changes. (I.e. don't have the form HTML already present.)
Another option would be to update the values, etc. in the existing form in the DOM using the view's render function.

Related

is there a way to change elements of a page before opening it

I have designed a page to be used as a tool. I am getting some challenges here since my experience is very little in the field and im only new.
- my goal is to change values of an element on a page that is not open yet.
- is there a function i can make on current page to change the values of the element on the next page to preset it to some static numbers or some of them are dynamic
I dont know how to manipulate something that is not open yet, i dont even know if that's something possible. I was able to change elements on my open current page, but dont know how to change something on the next page if i click on one of the links
Park Property Management
Millgate Manor
Weston Towers
Kingston
Region Of Peel
so i expect to click on one of the links and when the link opens some elements in the links i need them to be filled with some values that are static always
You can't directly influence the content of another page with JavaScript in the current page. That would have very big security concerns.
However, you could indirectly influence the content if you have access to the source for both pages, and can add JavaScript to both of them. Then, as some comments suggested, you can for example use search paramaters in the link url to pass along information.
(Search parameters are the stuff that comes at the end of a url sometimes and looks something like ?name=john&id=555)
You can read more about about working with search parameters in JavaScript here:
https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams
Don't get discouraged! You're capabilities will grow as you try to make things work. (That's almost the only time they will grow.)
A word of caution!
Please be very careful when using search parameters to modify or display content on a page as there are some real security concerns involved. Never display anything from the search parameters directly on the page without validating the input first. A good way to handle dynamic content based on search parameters, at least if you know the possible options available, is to have some if .. else statements or maybe a switch block that you try to match the search parameters against, and simply not display anything at all if the content of the parameter does not match any input that you're expecting.

Creating breadcrumbs for table navigation VUEJS

I'm a Junior Developer and I'm currently having a big issue with breadcrumbs.
For this application, I'm using VueJS and the problem I'm having is the following:
*The user clicks on 'tables' and is sent to the 'tables' page.
-On that 'tables' page, he has a big table in which he's able to click on the various columns to show a new table with data relevant to the column he clicked on.
*For this I'm on the same component so I'm not using routers, but using v-show as I don't want the tables to rerender.
My problem is the following, I have to make a breadcrumbs as he navigates to the different tables (ie: table/holdingList/entrepriseList/clientList..). and they have to be clickable so that I'm able to create a function that injects data into the table or to simply 'show' it and close the others.
Can anyone give me a brief out-line of how to do this? Sorry if it seems trivial. I've already spent a couple of days on it and my brain has turned to mush...
I will start from the easiest solution to implement:
Each v-show will depend on a different data object. Then your breadcrumb has an #click method that will set every v-show data object to false. Give the method a parameter with the name of the data object that you intend to show and display that to true.
The previous answer is enough to get it working. Other ways of achieving the same result in a more maintainable way are:
Create one data object named as activeTable and turn your v-show into a v-if. When you click on the breadcrumb element you change the activeTable data object to an identifier for the table you wish to display. After that your vue-if simply checks if the activeTable === thisTableId. Where thisTableId is the identifier of each table.
You may want to start getting acquainted with Vuex specially if your tables share a similar layout. In that way you will store the data and there is no need to request your data again. This is useful if the data to populate your tables come from an API.
Finally on an SPA architecture there is no actual re-render so you may possibly want to look at that as well.
Please read the guidelines for posting an answer since they require you to show at least some effort from your side. Good Luck!

Fully custom lightbox in dhtmlxGantt

Hi there,
I'm looking at using dhtmlxgantt as a way of building up an itinerary i.e. you add items at specific days throughout a period (most likely 2 weeks)... However, there are quite a few extra variables that I need to store along with the standard info of dates etc. There are a series of 4 dropdowns which populate the next one via AJAX.
I know I can add custom controls into the lightbox but these will not work via AJAX when the previous dropdown is changed. I was hoping that I'd be able to make a fully custom lightbox which then passes everything back to dhtmlxGantt but I can't seem to find away...
It looks like it's possible in the scheduler product (http://docs.dhtmlx.com/scheduler/samples/02_customization/16_custom_form.html) can we do the same with Gantt?
Thanks in advance,
Adam.
You can just redefine gantt.showLightbox method and show your form from there. And then use public API to save changes - gantt.addTask, gantt.updateTask, gantt.deleteTask
Here is a crude example:
http://docs.dhtmlx.com/gantt/snippet/5e134aa1

How to implement a Tag Bar in javascript / css

I'm trying to implement a search bar for a web page having basically the same properties of the Tag bar appearing when you ask questions on Stack overflow:
It should have the following properties:
Allow the user to directly type in it.
Pull up entries with same letters as the user is typing.
Allow to delete an entry by either deleting on keyboard or pressing on inserted elements.
I'm interested in understanding the underlying structure of such an element and how to setup listeners and functions that call each other, not simply the code. Could anyone please help me figure out the skeleton of the functions I need to implement?
Besides just using a jQuery UI plugin, the simplest way to do it would be with a text input box and a ul. You can use jQuery (or something else depending on if you are using a framework) to listen to any change in the input box.
At that point you have a choice depending on the rest of your app: The filtering can happen in the front end or the backend. Because databases tend to be fairly quick, it might make sense to filter within it if you have a very large set of data. Otherwise, you could just grab the entire list and use JS to filter it.
Either way, have a callback occur on that change that initiates the filtering and then renders the results into the ul.

Dynamically display database information onclick

I set up a web service using LAMP for personal use.
Basically, I have a scrollable list with some database information I pull once in the PHP script. I'd like to be able to click on one of the items, and have more information appear in a preview pane . (preview pane is set up)
I don't expect to ever have more than 100 entries in my database. Also, the data I'm pulling is very small...about 10 fields, all text data.
My question is as follows:
If I pull all the data I need in one shot, how can I store it so that each block of data I define (2-3 rows are what I need in the preview pane) is "cached" and I can access that given block at will so I can display it upon clicking its corresponding list entry?
Basically, this is about the same as clicking an email in a web-browser and having the rest of the message show up in a preview pane.
Thanks.
nb: the fact that I'm using a preview pane or a list is irrelevant. Just describing what I'm doing.
If I understand correctly, you would like to create a simple page, where several details are hidden until you click on different buttons. If you would like to do this in a "cached" way, you can try the following:
Fetch the complete data so that everything (with details) ends up in the result HTML. Everything: I mean, the parts which should be visible at all times and also the details which should be visible only after pressing a button.
Now, to the design. You will have to write CSS code, which will hide the details. (Of course, for that, you will have to create HTML in step 1 which will let you target the details via CSS classes, for example.) You will also have to figure out how to create buttons.
The most complicated part is to bind the buttons to Javascript actions, which will perform showing the hidden details. You can control all CSS properties from Javascript, so for example you can alter the position, the size, the text color etc. of a <div> dynamically.
Most people nowadays use jQuery for tasks like the one in step 3, or even software libraries built on the top of jQuery. That could help a lot if you're just starting out with tasks like this one. On the jQuery site, you will find a great place to start, called the jQuery Learning Center.
Edit: I've created a very basic fiddle to let you test the JS part of my concept, see it here: http://jsfiddle.net/eL9mj/22/

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