How to set a field to be non-editable in jquery

In front-end development, we often need to create forms and let users fill in the form content. Different fields in the form need to be set to different states, some fields are read-only, and some fields may need to be completely disabled. In these scenarios, we can use jQuery to make fields uneditable.

1. Why do we need to set fields to be non-editable

In practical applications, we often need to set some fields in the form to be non-editable, for example:

1. When the user After the form has been submitted, in order to ensure data security, the form fields need to be locked to prevent users from modifying the submitted information.
2. Some sensitive information, such as account passwords, mobile phone SMS verification codes, etc., need to be set to read-only mode to prevent users from modifying them.
3. Some fields in the form need to be disabled under certain conditions. For example, when making a payment, if a certain payment method is selected, the user needs to be prohibited from modifying the payment amount and other information.

2. How to use jQuery to set fields to be non-editable

jQuery is a very popular JavaScript library that can be used to simplify HTML document operations, event processing, animation effects and other operations. In jQuery, we can use the attr() function to set the non-editable state of text boxes, drop-down boxes, check boxes and other elements.

Now, let’s look at a simple sample code:

<script><br>$(document).ready(function(){<br> // Disable text box<br> $("input[ type='text']").attr("disabled", "disabled");</p> <p>// Disable drop-down box<br> $("select").attr("disabled", "disabled" );</p> <p>// Disable checkbox<br> $("input[type='checkbox']").attr("disabled", "disabled");<br>});<br></script>

<select>
  <option value="male">男</option>
  <option value="female">女</option>
</select>

<input type="checkbox" name="hobby" value="reading">阅读
<input type="checkbox" name="hobby" value="music">音乐

3. jQuery implements the read-only and disabled states of fields

In the above example, we used the disabled attribute to disable the form element. But what if we need to set a form element to a read-only state? At this time, it can be achieved by setting the readonly attribute.

The difference between the readonly attribute and the disabled attribute is that the readonly attribute only prohibits users from editing the value of a form element, but users can still modify the value of the element through JS scripts and other methods. The disabled attribute completely disables the form element and users cannot operate the element.

Next, let’s look at a sample code to implement the read-only and disabled status of a field:

<script><br>$(document).ready(function(){<br> // Read only Text box<br> $("inputtype='text'").css({"background-color": "#ccc", "border": "none"});</p> <p>// Disable text Box<br> $("inputtype='text'").css({"background-color": "#ccc", "border": "none"});</p> <p>// Read-only drop-down Box<br> $("select[readonly]").css({"background-color": "#ccc", "border": "none"});</p> <p>// Disable drop-down box<br> $("select[disabled]").css({"background-color": "#ccc", "border": "none"});</p> <p>// Read-only checkbox<br> $("inputtype='checkbox'").click(function(){</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">return false;</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>});</p> <p>// Disable checkbox<br> $("inputtype=' checkbox'").click(function(){</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">return false;</pre><div class="contentsignin">Copy after login</div></div><div class="contentsignin">Copy after login</div></div> <p>});<br>});<br></script>

<select readonly>
  <option value="male">男</option>
  <option value="female">女</option>
</select>

<input type="checkbox" name="hobby" value="reading" readonly>阅读
<input type="checkbox" name="hobby" value="music" readonly>音乐

在上面的示例代码中，我们分别设置了文本框、下拉框和复选框的只读和禁用状态。当表单元素被设置为只读或禁用状态时，我们可以通过改变其样式以及绑定相应的事件来达到不同的效果。

总结

本文介绍了如何使用jQuery来设置表单元素的不可编辑状态，实现的方法包括禁用、只读、禁用样式等。在前端开发中，通过掌握这些方法，我们可以更好地控制表单元素的状态，提高用户体验及数据安全性。

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