Using a for loop in JavaScript to dynamically display TextBoxFor(model=> model[i].prop) in an MVC application

Question

Using a for loop in JavaScript to dynamically display TextBoxFor(model=> model[i].prop) in an MVC application

I need some help getting this code to function correctly:

$('#ddl').change(function () {

            $('#cont').html('');
            var count = getCount($('#ddl').val())
            for (var i = 0; i < count ; i++) {
                var html = '<div class="display-row">' +
                '<div class="display-label">' +
                'Value:' +
                '</div>' +
                '<div class="display-field">' +
                'From: @Html.TextBoxFor(model => model[i].From) To:@Html.TextBoxFor(model => model[i].To)' +
            '@Html.ValidationMessageFor(model => model[i].To)' +
                    '</div>' +
                '</div>';
                $('#cont').append(html);
            }

        });

I am having trouble accessing the value of i for model[i] inside the JavaScript loop.

Can anyone suggest a way to achieve that?

c#javascript jquery asp.net-mvc-4 razor

Answer 1

Answer №1

"I need to retrieve the value of i for model[i] within a JavaScript loop."

If you require this, you can initiate an ajax request to fetch your model as a JSON object. Subsequently, iterate over your list and perform required actions.

In your controller, establish an action method that will provide a list of your models:

return json(your model list);

Then in JavaScript:

$.post(url, {}, function(data){
    for(var i = 0; i < data.length; ++i) {
    }

});

Edit: When utilizing

@Html.TextBoxFor(model => model[i].Od)

on the server-side, the generated HTML will be as follows:

<input type="text" name="[i].Od" data-val="true" data-val-required="validationMessage" />

You can manually create these tags and usually place them within a form. For validation purposes, you may follow these steps:

//Remove current form validation information
$("form")
    .removeData("validator")
    .removeData("unobtrusiveValidation");

//Parse the form again
$.validator
    .unobtrusive
    .parse("form");

(last code reference from this post)

Answer 2

"I need to retrieve the value of i for model[i] within a JavaScript loop."

If you require this, you can initiate an ajax request to fetch your model as a JSON object. Subsequently, iterate over your list and perform required actions.

In your controller, establish an action method that will provide a list of your models:

return json(your model list);

Then in JavaScript:

$.post(url, {}, function(data){
    for(var i = 0; i < data.length; ++i) {
    }

});

Edit: When utilizing

@Html.TextBoxFor(model => model[i].Od)

on the server-side, the generated HTML will be as follows:

<input type="text" name="[i].Od" data-val="true" data-val-required="validationMessage" />

You can manually create these tags and usually place them within a form. For validation purposes, you may follow these steps:

//Remove current form validation information
$("form")
    .removeData("validator")
    .removeData("unobtrusiveValidation");

//Parse the form again
$.validator
    .unobtrusive
    .parse("form");

(last code reference from this post)

Answer 3

Answer №2

Attempting to accomplish this task in the manner described is not feasible. ASP.NET operates on the server side, while JavaScript functions solely within the web browser environment.

Answer 4

Attempting to accomplish this task in the manner described is not feasible. ASP.NET operates on the server side, while JavaScript functions solely within the web browser environment.

Answer 5

Answer №3

When working with ASP.net, it is important to note that the server-side code runs before any Javascript code. This means that when the Javascript code is executed, the page is already rendered as text and you cannot directly access model[i]. To work around this limitation, there are two options available:

If your model is small, consider having the server-side code generate a string containing a JavaScript array from the model and then have the JavaScript iterate through this array once the page is loaded.
For larger models or data sets, you can create a method in your controller that returns JSON data. Your JavaScript code can then make an AJAX call to this method to fetch the necessary data.

Answer 6

When working with ASP.net, it is important to note that the server-side code runs before any Javascript code. This means that when the Javascript code is executed, the page is already rendered as text and you cannot directly access model[i]. To work around this limitation, there are two options available:

If your model is small, consider having the server-side code generate a string containing a JavaScript array from the model and then have the JavaScript iterate through this array once the page is loaded.
For larger models or data sets, you can create a method in your controller that returns JSON data. Your JavaScript code can then make an AJAX call to this method to fetch the necessary data.

Using a for loop in JavaScript to dynamically display TextBoxFor(model=> model[i].prop) in an MVC application

Answer №1

Answer №2

Answer №3

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