jquery input is never editable

This article will introduce how to use jQuery to make the input box of the form uneditable.

In many applications, we usually use the input element, which is one of the basic HTML elements used to receive text input. In some cases, we want to set some input boxes to read-only mode to prevent users from editing in the input boxes. This may be because the text content is generated by a database or API, or is set to prevent misuse.

Generally speaking, in order to set the input box to a read-only state, we need to operate on the backend to control the output of HTML attributes (such as readonly). But in some cases, we may not have access to the backend code or cannot easily change the HTML attributes. In this case, we can handle this situation by using jQuery.

Here are some examples showing how to use jQuery to set the input box to a read-only state:

Example 1: Using the .prop method

.prop() in jQuery Methods are used to get or set property values. You can use the .prop() method to set an input box to read-only mode. The following code demonstrates how to use the .prop() method to achieve this:

<!-- HTML -->
<input type="text" id="myInput" value="只读输入框">

<!-- JavaScript & jQuery -->
$(document).ready(function() {
    $('#myInput').prop('readonly', true);
});

In this way, the input box will be set to read-only mode and the user will not be able to edit the text in it. If we need to modify the value of the input box, we only need to use jQuery's .val() method.

Example 2: Using the .attr method

The above example shows how to use the .prop() method to set the input box to read-only mode. But in some cases, the prop() method may not work properly. For example, in some versions of jQuery, prop can only control elements that exist after the document is loaded, and may not be effective for subsequent elements added through AJAX or other methods. At this point we can use the .attr() method instead of the .prop() method. The following is sample code using the .attr() method:

<!-- HTML -->
<input type="text" id="myInput" value="只读输入框">

<!-- JavaScript & jQuery -->
$(document).ready(function() {
    $('#myInput').attr('readonly', 'readonly');
});

This code will also set the input box to read-only mode. We can use the removeAttre() method to delete the readonly attribute so that the input box can be edited again.

Example 3: Using CSS

The method of the above two examples is to directly modify the attribute value of the element. The implementation method is simple but may destroy the purity of HTML. If we want to make the input box uneditable without modifying the element attribute value, we can use CSS styles to control it. Specifically, you can set CSS styles for input elements to prohibit user editing. The following is a sample code using CSS:

<!-- HTML -->
<input type="text" id="myInput" value="只读输入框">

<!-- CSS -->
input[readonly] {
  background-color: #eee;
  cursor: not-allowed;
}

<!-- JavaScript & jQuery -->
$(document).ready(function() {
    $('#myInput').attr('readonly', 'readonly');
});

This code will add a style to all readonly attribute input boxes, making them have a gray background and display a prohibition symbol, preventing users from editing. This method does not rely on JavaScript and does not change HTML attribute values. When we need to reset the input box to editable, we only need to remove input[readonly] and the corresponding rules in CSS.

Sharing summary

In applications, sometimes it is necessary to set the input box to read-only mode. With jQuery, this can be easily achieved to prevent users from making mistakes. We can use the .prop() and .attr() methods to change element attribute values, or we can use CSS styles to control the input box as uneditable. In addition, we can also use some other methods to achieve the same purpose, such as setting the disabled attribute of the input element to true, or using various jQuery plug-ins. The example shown in this article is only one of the jQuery implementation methods, and readers can choose according to actual application needs.

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