jquery gets different ids

Jquery is a very popular JavaScript library used to simplify DOM manipulation and web development. In development, it is often necessary to obtain the IDs of different elements in order to perform different operations on them. In this article, we will explore how to get different ids using Jquery and implement common use cases.

1. Get the id of a single element

Getting the id of a single element is one of the most common uses in Jquery. Normally, we can use $("#id") Jquery selector to select an element and use attr('id') method to get its id value. For example, if we have the following HTML code:

<div id="myDiv">这是一个Div元素 </div>

We can use the following code to get the id of that Div element:

var myDiv = $("#myDiv").attr('id');

2. Get the id of multiple elements

In Jquery, we can use class selectors to select multiple elements and traverse them using the .each() method. We can then use the attr('id') method to get the id value of each element. For example, if we have the following HTML code:

<div id="div1" class="myDiv">Div元素1 </div>
<div id="div2" class="myDiv">Div元素2 </div>
<div id="div3" class="myDiv">Div元素3 </div>

We can get the id of these Div elements using the following code:

$('.myDiv').each(function(){
    var id = $(this).attr('id');
    console.log(id);
});

This will print the id of each element to the console.

3. Get the child element id within the selected parent element

In some cases, you may need to get all the child element ids within a parent element, for example Build a navigation menu. We can use the .find() method to select all child elements within the parent element and iterate through them using the .each() method. We can then use the .attr('id') method to get the id value of each child element. For example, if we have the following HTML code:

<div id="menu">
    <ul>
        <li id="home">主页</li>
        <li id="about">关于</li>
        <li id="contact">联系我们</li>
    </ul>
</div>

We can get the ids of these child elements using the following code:

var menu = $("#menu");
menu.find('li').each(function(){
    var id = $(this).attr('id');
    console.log(id);
});

This will print the id of each child element to the console.

4. Get the id of the form element

In web development, form elements usually need to get their id for form validation and submission. We can use Jquery selector $(":input") to select all form elements and iterate through them using .each() method. We can then use the .attr('id') method to get the id value of each form element. For example, if we have the following HTML code:

<form>
    <input type="text" id="name" name="name" value="请输入姓名">
    <input type="email" id="email" name="email" value="请输入邮箱">
    <input type="tel" id="phone" name="phone" value="请输入联系电话">
    <button type="submit" id="submit">提交</button>
</form>

We can get the ids of these form elements using the following code:

$('form :input').each(function(){
    var id = $(this).attr('id');
    console.log(id);
});

This will print the id of each form element to the console.

5. Get the id of a dynamically added element

In some cases, you may need to dynamically add an element programmatically and get its id. In this case, we can use Jquery selector $(":last") to select the last element and add new elements after it using .after() method. We can then get the id of the new element using the .attr('id') method. For example, if we have the following HTML code:

<div id="myDiv">
    <button id="btn1">按钮1</button>
</div>

We can use the following code to dynamically add a new button and get its id:

var newButton = $('<button id="btn2">按钮2</button>');
$("#myDiv button:last").after(newButton);
var id = newButton.attr('id');
console.log(id);

This will print the new button's id to the console .

Conclusion

In this article, we have taken a deep look at how to get the ids of different elements using Jquery. Whether you are getting the id of a single element or multiple elements, or getting the id of a form element or dynamically added element, you can use the above method to achieve it. I hope this article will be helpful to your development work!

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