Remove specified text in jquery

JQuery is an efficient, fast and simple JavaScript library, which can help us handle DOM operations, event processing, animation effects, etc. more conveniently. During the development process, we often encounter situations where we need to remove specified text from text. This article will introduce how to remove specified text in JQuery.

1. Use the replace method

The replace method in JQuery can be used to replace certain characters in a string. We can use this method to remove specified text and use regular expression matching to The specific code for deleted characters is as follows:

var str = "hello world";
var newStr = str.replace(/world/g,'');
console.log(newStr); //输出"hello "

In the above code, we need to use the replace method to remove "world" from the string "hello world". We use a regular expression wrapped between ///g parameter to represent a global scope match. The final newStr output is "hello". In this way, we can easily remove specified text as needed.

2. Use JQuery's text method

The text method is a method of the JQuery object, used to set or return the text content of a given element, which is InnerText. We can use the text method to remove specified text. The specific code is as follows:

var str = "hello world";
var newStr = $('body').text(function(){
    return $(this).text().replace(/world/g,'');
}).text();
console.log(newStr); //输出"hello "

In the above code, we need to use the text method to take out all the text content in the web page, then use the replace method to remove "world", and finally set the new text content back to the document middle. The final newStr output is "hello". In this method, we can traverse all text and flexibly remove specified text.

3. Filter elements through the filter method

The filter method is a method of the JQuery object. It can filter out elements that meet specific rules. We can use this method to remove specific text. The specific code is as follows:

var str = "hello world";
var newStr = $("body").contents().filter(function(){
    return this.nodeType == 3 && this.nodeValue.indexOf("world") >= 0;
}).each(function(){
    this.nodeValue = this.nodeValue.replace(/world/g,'');
});
console.log(str); //输出"hello"

In the above code, we need to use the filter method to filter out all text nodes and nodes containing the "world" character. During the filtering process, we obtain the value of the text node through the nodeValue attribute, then use the replace method to remove "world", and finally reassign the text content of the modified text node to the nodeValue attribute. The final output string is "hello". In this method, we only remove text nodes containing specified characters, which is more rigorous.

Summary

This article introduces three JQuery methods to remove specified text, namely using the replace method, using the text method and the filter method. Each method has its own advantages and disadvantages, and can be selected according to actual needs. JQuery can easily operate DOM, greatly improving development efficiency.

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