I have this problem:
I have 3 templates:
Search_user
Show_user
Edit_user
Whit the search_user I'm getting the name value with the post method, then I'll search the data in the db, save the data in an array called user and then pass the array to the Show_user template.
In the Show_user template I show the data with {{ user[0] }}, {{ user[1] }}...{{ user[7] }}, under this data I have a button that bring me to the Edit_user template.
But in the Edit_user template I don't know how to pass the previous data, I don't know hot to export data with the post method or any other methods.
A walk around could be <input type="text" name="surname" value="user[0]" required> but I don't want to show the textbox in the Show_user template.
You don't need to pass any data except some kind of user identifier (a number or a user name) to fetch the user back from the database when needed.
It can be done in multiple ways:
add it to the endpoint URL in the form action (/user/edit/<user-id>)
or use your web framework session to store the user identifier
or add the identifier to your templates as a hidden form field (type=hidden)
...
In any case you just need to get that piece of information (from the URL endpoint, from the session, from the form data...), use it to fetch the user from the database, then pass the user to the edit template.
If you're using a web framework just read the docs, this is a trivial use case that we'll be very likely well documented.
If you need more details, please, share a few code fragments.
Related
I have a database that uses formset to help store data. How do I get the ‘value’ of the numbers of data in the template? For example, I got a queryset of {[Item 1],[ Item 2]}. How do I get the value of 2 in the template to tell me there's 2 items? I want to use this value to control the amount of stuff I can clone with a click of the button. I'm using Django for the web
You just ask |length of the queryset, like:
{{ queryset|length }}
will be returning the number of element
I have few checkboxes in my template whos value is the id of database row. I am using AJAX to post these values back and forth.
{% for item in sale_order_items %}
<tr>
<td class="text-center">
<input type="checkbox" name="saleorderitem" value="{{item.id}}">
</td>
</tr>
item.id for instance renders to 1. Now what if the user changes the value from 1 to 2 in browser using "inspect" and submits the form. what can I do at the frontend or django backend to prevent this and check if the user is submitting the same values as intended?
This depends on many different things but to take you back to the basics: When you create a function in order to bulletproof it out of any errors you use type and value checks.
I would think the best approach to this is to add some back-end checks. The form values returned would have to adhere a set of rule such as a value threshold. If the value returned is beyond that threshold then that would mean that something has changed in the HTML.
You add a check if it fails then the back-end would return an error. In collaboration with front-end you refresh the page and return an error message. It might be really terrible UX but an average end user would never change values using their inspector.
The other alternative is to use javascript to detect any kind of HTML/DOM mutations or changes which I would advice against. Having values to be checked against specific criteria (using the back-end) is best as it foolproofs info passed on to your server against any change.
I found a solution, in this scenario django session variable can be used to store data between requests. When I load the form, I set the session variable to the required values, then on form submission, I check the submitted values with the values in session variable. And it works.
The app I am working on has hidden input variables set on initial load of the page. The variables need to be accessed across all pages. The reason for not converting these to session variables is the user can open another browser with different parameters and passing those value as hidden inputs make it work without any issue. What is the best possible alternative so as to get rid of these hidden inputs..I tried converting all variables into a Structure, but again the structure needs to be posted as part of form submission to make it available to subsequent pages.Another disadvantage of this app is use of frames.I don't have any code to post.
It sounds as if you want different browsers instances which are associated with the same web session to maintain their own distinct sets of data. Doing this by passing form or url variables around seems like a bad idea.
One approach that you could use would be, onSessionStart (or as required), create a structure in the users session to hold instances of the data. For example
session.data = {
someRandomKey: {
valueA: 42,
valueB: "Porridge"
}
}
Then just pass someRandomKey as a hidden form field or querystring parameter. Now, when they submit the form to update variables you use the id from the hidden form field to find the appropriate structure from session.data.
When the user needs a new instance of this form, give them some way, like a link or button, that creates a new unique key, inserts a struct in session.data with this key and populates it with whatever defaults are needed then loads the form passing along the new id as a hidden form field or querystring param again.
I am currently trying to take a value from a drop down list, store it into a variable, and pass it into a controller's action result. When I run my code, the Index is supposed to store the value of the selected item in the dropdown box in the variable SelectedDistrict, then then go to the Query action. Query will take a variable of DistrictViewModel as a parameter and then use var school = getQuery(variable.SelectedDistrict) to go into the function I have. In the function however, it's saying that the variable sd is null whenever i debug. Maybe the value from the drop down box is not storing properly? In the end, I want to display in a table all of the schools in my school table that come from the selected district in the drop down. The table is not being populated because of the null value. Here is my code for more clarity.
District View Model:
School View Model:
Controller w/ getQuery function:
Index View:
Query View:
The table when I run my code:
The problem is that your controller method for Query is expecting some data to be passed in the form of an object, but you aren't passing anything to it. If it's a GET request (and it appears to be because you just set location.href on click), the values would need to be in the query string. Alternatively you can make your form POST to that controller action instead.
You'll need <form> tags. You can GET or POST to your controller method, it won't matter (model binding works either way). It depends on whether you want people to be able to deep-link directly to the search results or not.
<form action="#Url.Action("Query", "District") method="get">
#Html.DropDownListFor(m => m.SelectedDistrict, Model.Districts)
<button type="submit" value="Submit"/>
</form>
That pretty much should do it, or at least get you on the right path.
i have a custom post type
this post type needs some fields to be inserted into a custom MySQL table (wp_my_custom_table) where i store some relations IDs with other products and a number to sort them
i don't know how to put these input fields them after the textarea. I know how to insert them at "save_post" action hook.
these are not registered as "custom fields", are just a few input fields needed for each post type like this
The tag doesn't work, so i put the code that i have tried as image:
I have found, there is a hook "edit_form_after_editor".