I want to make 3 dependents drop down list, each drop down dependent to the previous drop down, so when I select an item from first drop down , all data fetch from database and add to second drop down as item.
I know how to do this in a normal php page using ajax, but as opencart uses MVC I don't know how can I get the selected value
Basically, you need two things:
(1) Handling list changes
Add an event handler to each list that gets its selected value when it changes (the part that you already know), detailed tutorial here in case someone needed it
Just a suggestion (for code optimization), instead of associating a separate JS function to each list and repeating the code, you can write the function once, pass it the ID of the changing list along with the ID of the depending list and use it anywhere.
Your HTML should look like
<select id="list1" onchange="populateList('list1', 'list2')">
...
</select>
<select id="list2" onchange="populateList('list2', 'list3')">
...
</select>
<select id="list3">
...
</select>
and your JS
function populateList(listID, depListID)
{
// get the value of the changed list thorugh fetching the elment with ID "listID"
var listValue = ...
// get the values to be set in the depending list through AJAX
var depListValues = ...
// populate the depending list (element with ID "depListID")
}
(2) Populating the depending list
Send the value through AJAX to the appropriate PHP function and get the values back to update the depending list (the part you are asking for), AJAX detailed tutorial here
open cart uses the front controller design patter for routing, the URL always looks like: bla bla bla.bla/index.php?route=x/y/z&other parameters, x = folder name that contains a set of class files, y = file name that contains a specific class, z = the function to be called in that class (if omitted, index() will be called)
So the answer for your question is:
(Step 1) Use the following URL in your AJAX request:
index.php?route=common/home/populateList
(Step 2) Open the file <OC_ROOT>/catalog/controller/common/home.php , you will find class ControllerCommonHome, add a new function with the name populateList and add your logic there
(Step 3) To use the database object, I answered that previously here
Note: if you are at the admin side, there is a security token that MUST be present in all links along with the route, use that URL:
index.php?route=common/home/populateList&token=<?php echo $this->session->data['token'] ?> and manipulate the file at the admin folder not the catalog
P.S: Whenever the user changes the selected value in list # i, you should update options in list # i + 1 and reset all the following lists list # i + 2, list # i + 3 ..., so in your case you should always reset the third list when the first list value is changed
P.P.S: A very good guide for OC 1.5.x => here (It can also be used as a reference for OC 2.x with some modifications)
Related
I have over 3200 rows in a Google Sheet. I need a dropdown with each value on a web app.
I have this in Apps Script:
function doGet(e) {
var htmlOutput = HtmlService.createTemplateFromFile('CensusWebApp2');
var streets = getStreets();
var businessNames = getbusinessNames();
htmlOutput.message = '';
htmlOutput.streets = streets;
htmlOutput.businessNames = businessNames;
return htmlOutput.evaluate();
}
function getbusinessNames(){
var ss= SpreadsheetApp.getActiveSpreadsheet();
var StreetDataSheet = ss.getSheetByName("businessNames");
var getLastRow = StreetDataSheet.getLastRow();
var return_array = [];
return_array= StreetDataSheet.getRange(2,1,getLastRow-1,1).getValues();
return return_array;
}
This is the HTML code
<select type="select" name="IntestazioneTari" id="IntestazioneTari" class="form-control" >r>
<option value="" ></option>
<? for(var i = 0; i < businessNames.length; i++) { ?>
<option value="<?= businessNames[i] ?>" ><?= businessNames[i] ?></option>
<? } ?>
</select><be>
I'm creating an app similar to surveys forms, but this dropdown will be the same for every entry.
Is there a way to load this only once and not every time the form is submitted and got again for a new survey entry? (from the same operator/device)
I believe your goal as follows.
You want to use the value of businessNames retrieved from Google Spreadsheet at HTML side.
The value of businessNames is not changed. So you want to load the value only one time.
In this case, how about declaring the value in the tag of <script> as a global? When this point is reflected to your script it becomes as follows.
Modified script:
In this case, your HTML side is modified.
<select type="select" name="IntestazioneTari" id="IntestazioneTari" class="form-control" >r>
<option value="" ></option>
<? for(var i = 0; i < businessNames.length; i++) { ?>
<option value="<?= businessNames[i] ?>" ><?= businessNames[i] ?></option>
<? } ?>
</select>
<input type="button" value="ok" onclick="test()">
<script>
const value = JSON.parse(<?= JSON.stringify(businessNames) ?>); // Here, the value of "businessNames" is retrieved.
function test() {
console.log(value);
}
</script>
In this modification, when the HTML is loaded, the value of businessNames is added to the HTML by evaluate() method. At that time, businessNames is given to HTML and Javascript. By this, const value = JSON.parse(<?= JSON.stringify(businessNames) ?>); has the value of businessNames. In order to confirm this value, when you click a sample button of <input type="button" value="ok" onclick="test()">, you can see the value at the console. By this, you can use the value of businessNames at the Javascript side after HTML is loaded.
Reference:
HTML Service: Templated HTML
As the values from the spreadsheet won't change, I created a really long text row with all the options and pasted them directly in the HTML.
I made the same with the other information. Load time decreased enormously.
This is the code I use to generate the values:
return_array= "<option>" + businessNamesSheet.getRange(2,1,getLastRow-1,1).getValues().join("</option><option>")+"</option>";
We are talking about performance, and there are 3 things you need to do when doing so:
Make measurements
Make measurements again
And make some more measurements
A change in the code could have a negative impact for a reason that you didn't expect (it's hard to keep every single little detail in mind). When making a Google Apps Script web app, you have 3 reported times:
The timings in your browser. How much did it really take to load the entire page
The running time on Google Apps Script execution log.
Small timing inside your application using console.time (reference), console.timeLog (reference) and console.timeEnd (reference) (collectively called console timers).
Note that the first 2 may change without you changing a thing, probably because of the inner working in Google.
So let's start doing what I said: measuring. I'd measure:
The entire doGet function
The getStreets()
The getbusinessNames()
The template.evaluate()
How much time it takes to load the page (browser)
This will give me a rough idea on what takes most of the time. Knowing that, you can try the following ideas.
Note that I don't have your code so I can't tell how it will effect your times, so your mileage may vary. Also note that most ideas could be implemented simultaneously, this doesn't mean it's a good idea and can even slow what a single idea could have achieved.
Idea 1: Copy the generated options into the template
If you don't need to load the options from somewhere (like I suppose you are doing), you could generate the template once, copy the generated options and paste it to the HTML. This will obviously avoid the problem of having the request the list of options and evaluating them every time, but you lose flexibility.
Idea 2: Having the options in code instead of somewhere else
If the options won't change or you will be changing them, you could add them into your code:
const BUSINESS_NAMES = `
business 1
hello world
another one
and another one
`
function getbusinessNames() {
return BUSINESS_NAMES
.split('\n')
.filter(v => !!v) // remove empty string
}
It's similar to idea 1 but it's easier to change the values when needed, specially when using the V8 support for multi line strings.
Idea 3: Use a Google Apps Script cache
If what's taking time is querying the options, you could use CacheService (see reference). This would allow you to only query the options every X seconds (up to 6 hours) instead of every time.
function doGet(e) {
// [...]
const cache = CacheService.getScriptCache()
let businessNames = cache.get('businessNames')
if (businessNames == null) {
businessNames = getbusinessNames()
cache.put('businessNames', businessNames, 6*60*60)
}
// use businessNames
// [...]
}
In this case I've only done it with businessName but it can also be use in streets.
having a 6 hour cache means that it could take up to 6 hours for a change in the list to propagate. If you add the options manually you could add a function to force the reloading it:
function forcecacheRealod() {
cache.put('streets', getStreets(), 6*60*60)
cache.put('businessNames', getbusinessNames(), 6*60*60)
}
Idea 4: Improve how you load the data
Is very common for new Google Apps Script users to iterate the rows one by one getting the value. It's way more efficient to get the proper range with all the rows and columns and call getValues (reference).
Idea 5: do a fetch instead of submitting the form
If what is happening is that it takes time to load after sending the data, it might be a good idea to use google.script.run (reference) instead of making a form and submitting it, since it could prevent reloading the entire page again.
Idea 6: SPA web app
The result of doubling down on the last idea. Same benefits and you could load the necessary data in the background while the user lands on the home page.
Idea 7: Load the options dynamically
Use google.script.run (reference) to load the options once the page has already been loaded. May actually be slower but you can give faster feedback to the user.
Idea 8: Save the options in localStorage
Requires idea #7. Save the dynamically loaded options into localStorage(see reference) so the user only needs to wait once. You may need to load them once in a while to make sure they are up-to-date.
References
Console timer (MDN)
CacheService (Google Apps Script reference)
Range.getValues() (Google Apps Script reference)
Class google.script.run (Client-side API) (Google Apps Script reference)
Window.localStorage (MDN)
I built a web app with CodeIgniter 3, with PHP 7.0 and MySQL 5.6.
I have a table named 'departments' and the users can create rows with a form on the app.
The result in the database looks like this:
id 1
name accounting
In another form, I allow users to create a sub-department, which depends on one department. I let the user choose the department in a dropdown menu. The name of the options are the name of the department and the value is the id, according to the stored data.
<select name="department">
<option value="department_id">department_name</option>
...
</select>
But I use the CodeIgniter form_helper, so I get the data from my database, an array containing the rows (which are arrays):
echo form_drop_down('department', $departments_from_DB);
I read in the CI's DOC (about html_escape() function) that the form_helper should escape its content:
If you use any of the form helper functions listed on this page, the form values will be automatically escaped, so there is no need to call this function. Use it only if you are creating your own form elements.
But when I make a test with an alert script, the alert works, so...
I don't know how to escape the names of the departments. In fact I know, html_escape() works, but sometimes it's needed, sometimes not, sometimes it escapes twice, I'm a little confused.
A solution could be to write the html code in a loop, and escape the PHP value, but is there a more elegant solution ?
The form_dropdown() function escapes the values of the <option value="xxx">Name</option> tag ('xxx' in my example), but not the word between the tags ('Name' in my example).
To escape everything, use html_escape() on the array given the the form_dropdown() function.
Example:
$array_data = array(
'a' => 'Jack',
'<script>bad_script</script>' => 'John',
'c' => '<script>another_bad_script</script>'
);
// this will escape the array's key values (Jack and John are ok but not the last one)
echo form_dropdown('select_value', $array_data);
// this will escape the entire array
echo form_dropdown('select_value', html_escape($array_data));
I need to update multiple targets when a link is clicked.
This example builds a list of links.
When the link is clicked, the callback needs to populate two different parts of the .html file.
The actual application uses bokeh for plotting.
The user will click on a link, the 'linkDetails1' and 'linkDetails2' will hold the script and div return from calls to bokeh.component()
The user will click on a link, and the script, div returned from bokeh's component() function will populate the 'linkDetails'.
Obviously this naive approach does not work.
How can I make a list of links that when clicked on will populate two separate places in the .html file?
################################
#views/default/test.html:
{{extend 'layout.html'}}
{{=linkDetails1}}
{{=linkDetails2}}
{{=links}}
################################
# controllers/default.py:
def test():
"""
example action using the internationalization operator T and flash
rendered by views/default/index.html or views/generic.html
if you need a simple wiki simply replace the two lines below with:
return auth.wiki()
"""
d = dict()
links = []
for ii in range(5):
link = A("click on link %d"%ii, callback=URL('linkHandler/%d'%ii), )
links.append(["Item %d"%ii, link])
table = TABLE()
table.append([TR(*rows) for rows in links])
d["links"] = table
d["linkDetails1"] = "linkDetails1"
d["linkDetails2"] = "linkDetails2"
return d
def linkHandler():
import os
d = dict()
# request.url will be linked/N
ii = int(os.path.split(request.url)[1])
# want to put some information into linkDetails, some into linkDiv
# this does not work:
d = dict()
d["linkDetails1"] = "linkHandler %d"%ii
d["linkDetails2"] = "linkHandler %d"%ii
return d
I must admit that I'm not 100% clear on what you're trying to do here, but if you need to update e.g. 2 div elements in your page in response to a single click, there are a couple of ways to accomplish that.
The easiest, and arguably most web2py-ish way is to contain your targets in an outer div that's a target for the update.
Another alternative, which is very powerful is to use something like Taconite [1], which you can use to update multiple parts of the DOM in a single response.
[1] http://www.malsup.com/jquery/taconite/
In this case, it doesn't look like you need the Ajax call to return content to two separate parts of the DOM. Instead, both elements returned (the script and the div elements) can simply be placed inside a single parent div.
# views/default/test.html:
{{extend 'layout.html'}}
<div id="link_details">
{{=linkDetails1}}
{{=linkDetails2}}
</div>
{{=links}}
# controllers/default.py
def test():
...
for ii in range(5):
link = A("click on link %d" % ii,
callback=URL('default', 'linkHandler', args=ii),
target="link_details")
...
If you provide a "target" argument to A(), the result of the Ajax call will go into the DOM element with that ID.
def linkHandler():
...
content = CAT(SCRIPT(...), DIV(...))
return content
In linkHandler, instead of returning a dictionary (which requires a view in order to generate HTML), you can simply return a web2py HTML helper, which will automatically be serialized to HTML and then inserted into the target div. The CAT() helper simply concatenates other elements (in this case, your script and associated div).
I use a RESTAdapter model to fill a Ember's select view with options.
The contentBinding is mapped the a property in the controller, where I use this.set('myProperty', model.find(someQuery)).
model.find(someQuery) with 1 result works perfect, but model.find(someQuery) with many results have a weird effect. The last object from the result is showed as many times as the length of the result.
{{view Ember.Select contentBinding="myProperty" optionValuePath="content.id"
optionLabelPath="content.name"
selectionBinding="selectedResult"
prompt=" "}}
Interesting. At first glance the code you included in your question looks fine. To debug:
1) Check to be sure the query results are what you expect.
content = model.find(someQuery); //with many results
// wait for results...
console.log(content.getEach('id')); //expect array of ids
console.log(content.getEach('name')); //expect array of names
2) examine contents of myProperty - from template:
{{#each myProperty}}
<pre>{{id}}.{{name}}</pre>
{{/each}}
Expect template to output id/name for each option.
If I programmaticly add a item to a shopping cart (setting its custom options) then add another instance of the same item to the cart (with its custom options set to different values), "view cart" lists each item instance on a separate line (good). However, if when adding the items, I programmaticly set one item's special price (via SetSpecialPrice), both item prices change to that special price.
How do I limit the effects of SetSpecialPrice to only the item instance I call that method on?
Thank you,
Ben
To the code you are adding the same 'item' to the quote. This could probably be considered a bug.
You may have to go lower level. What method are you using to add the items to the cart? You may need to emulate what that method does yourself (violating DRY principles) to force it to create a new 'item.'
... going to look in the code now.
Ok, looking at Mage/Sales/Model/Quote.php line 935: public function getItemsByProduct - this is where it determines if the product you are adding already exists. It calls $item->representProduct, which is in Mage/Sales/Model/Quote/Item.php line 301: public function representProduct
If you override this class in your module/code and replace this method you should be able to add simple code that detects if there is a difference in special price and react accordingly.
Code snipet:
$specialPrice = $product->getSpecialPrice();
$thisSpecialPrice = $itemProduct->getSpecialPrice();
if((is_null($specialPrice) xor is_null($thisSpecialPrice))||
(!is_null($specialPrice) && !is_null($thisSpecialPrice && $specialPrice!=$thisSpecialPrice))){
return false;
}