Web Front-end
JS Tutorial
jQuery implements IE input box to complete placeholder tag code sharing
jQuery implements IE input box to complete placeholder tag code sharing
This article mainly introduces how jQuery implements the placeholder tag function of the IE input box, involving jQuery event response and dynamic operation of page element attributes. Friends who need it can refer to it. I hope it can help everyone.
If you add the placeholder="xx" attribute to the input box, for example:
<input type="text" placeholder="请输入关键词"/>
, you can wait on Google Chrome The function of replacing text is implemented in the input box of the advanced browser, that is, the dialog box shown below is obtained:
But this attribute is in the default browser IE8 of WIN7 Incompatible, let alone IE6. In other words, the placeholder tag is not supported in IE.
If you don’t believe it, you can pull this code and run it in IE8 and try it. You will just get an empty dialog box
To achieve this in IE, you need to use component loss Focus blur and get focus are done in focus. For details, please refer to "Methods for Passing Values Between JavaScript Component Focus and In-page Anchor Points"
In fact, you can do without jQuery at all. This is used here to review "jQuery Control Through The node implementation only completes parameter transfer in the foreground through the get method》
The idea is very simple. At the beginning, this text box defaults to #cccccc gray font and the value is "Please enter the keyword". After getting the focus, put it The color is set to #000000 black and the value is empty. Once it loses focus, if the value is empty, it will be restored to the default #cccccc gray font. The value is "Please enter keywords"
The code is as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>搜索输入框替换文本</title>
<script type="text/javascript" src="js/jquery-1.11.1.js"></script>
</head>
<body>
<form id="test">
<input id="searchKeyword" type="text" maxlength="30" value="请输入关键词" style="color:#cccccc" />
</form>
</body>
</html>
<script type="text/javascript">
$(document).ready(function(){
var isthisnull = true ;
$("#searchKeyword").focus(function(){
if ($(this).val() == "请输入关键词" && isthisnull) {
$(this).val("");
$(this).attr("style","color:#000000");
isthisnull = false;
}
});
$("#searchKeyword").blur(function(){
if ($(this).val() == "") {
$(this).val("请输入关键词");
$(this).attr("style","color:#cccccc");
isthisnull = true;
}
});
});
</script>Note here that a Boolean value of isthisnull is added to determine whether it is empty, in order to determine whether the user wants to enter "Please enter the keyword",
You cannot think that if there is "Please enter keywords" in the text box, it is empty. What if the user enters "Please enter keywords" himself?
You should not use jquery or javascript here to determine whether the value of color or style is "#cccccc" or "color:#cccccc", because $(this).css(" color") to get color, the output results will be different depending on the browser, and if you get style, IE will think it is an object, not a string
Set an isthisnull, also You can prepare for further form validation
Finally, you will get the following effect in IE:
Detailed explanation of how to use placeholder in React Native
jQuery encapsulated placeholder example code
Detailed introduction to HTML5 Placeholder attribute
The above is the detailed content of jQuery implements IE input box to complete placeholder tag code sharing. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1387
52
Detailed explanation of jQuery reference methods: Quick start guide
Feb 27, 2024 pm 06:45 PM
Detailed explanation of jQuery reference method: Quick start guide jQuery is a popular JavaScript library that is widely used in website development. It simplifies JavaScript programming and provides developers with rich functions and features. This article will introduce jQuery's reference method in detail and provide specific code examples to help readers get started quickly. Introducing jQuery First, we need to introduce the jQuery library into the HTML file. It can be introduced through a CDN link or downloaded
How to use PUT request method in jQuery?
Feb 28, 2024 pm 03:12 PM
How to use PUT request method in jQuery? In jQuery, the method of sending a PUT request is similar to sending other types of requests, but you need to pay attention to some details and parameter settings. PUT requests are typically used to update resources, such as updating data in a database or updating files on the server. The following is a specific code example using the PUT request method in jQuery. First, make sure you include the jQuery library file, then you can send a PUT request via: $.ajax({u
How to remove the height attribute of an element with jQuery?
Feb 28, 2024 am 08:39 AM
How to remove the height attribute of an element with jQuery? In front-end development, we often encounter the need to manipulate the height attributes of elements. Sometimes, we may need to dynamically change the height of an element, and sometimes we need to remove the height attribute of an element. This article will introduce how to use jQuery to remove the height attribute of an element and provide specific code examples. Before using jQuery to operate the height attribute, we first need to understand the height attribute in CSS. The height attribute is used to set the height of an element
jQuery Tips: Quickly modify the text of all a tags on the page
Feb 28, 2024 pm 09:06 PM
Title: jQuery Tips: Quickly modify the text of all a tags on the page In web development, we often need to modify and operate elements on the page. When using jQuery, sometimes you need to modify the text content of all a tags in the page at once, which can save time and energy. The following will introduce how to use jQuery to quickly modify the text of all a tags on the page, and give specific code examples. First, we need to introduce the jQuery library file and ensure that the following code is introduced into the page: <
How to cancel the automatic jump to Edge when opening IE in Win10_Solution to the automatic jump of IE browser page
Mar 20, 2024 pm 09:21 PM
Recently, many win10 users have found that their IE browser always automatically jumps to the edge browser when using computer browsers. So how to turn off the automatic jump to edge when opening IE in win10? Let this site carefully introduce to users how to automatically jump to edge and close when opening IE in win10. 1. We log in to the edge browser, click... in the upper right corner, and look for the drop-down settings option. 2. After we enter the settings, click Default Browser in the left column. 3. Finally, in the compatibility, we check the box to not allow the website to be reloaded in IE mode and restart the IE browser.
Use jQuery to modify the text content of all a tags
Feb 28, 2024 pm 05:42 PM
Title: Use jQuery to modify the text content of all a tags. jQuery is a popular JavaScript library that is widely used to handle DOM operations. In web development, we often encounter the need to modify the text content of the link tag (a tag) on the page. This article will explain how to use jQuery to achieve this goal, and provide specific code examples. First, we need to introduce the jQuery library into the page. Add the following code in the HTML file:
Understand the role and application scenarios of eq in jQuery
Feb 28, 2024 pm 01:15 PM
jQuery is a popular JavaScript library that is widely used to handle DOM manipulation and event handling in web pages. In jQuery, the eq() method is used to select elements at a specified index position. The specific usage and application scenarios are as follows. In jQuery, the eq() method selects the element at a specified index position. Index positions start counting from 0, i.e. the index of the first element is 0, the index of the second element is 1, and so on. The syntax of the eq() method is as follows: $("s
How to tell if a jQuery element has a specific attribute?
Feb 29, 2024 am 09:03 AM
How to tell if a jQuery element has a specific attribute? When using jQuery to operate DOM elements, you often encounter situations where you need to determine whether an element has a specific attribute. In this case, we can easily implement this function with the help of the methods provided by jQuery. The following will introduce two commonly used methods to determine whether a jQuery element has specific attributes, and attach specific code examples. Method 1: Use the attr() method and typeof operator // to determine whether the element has a specific attribute
