How to intercept string with comma in jquery

When using jQuery to perform DOM operations, you often need to intercept some strings for processing. You may encounter a series of values ​​separated by commas and need to intercept them for processing. So how to use jQuery to intercept strings with commas? This article will take you through this issue and provide practical code examples.

The need to intercept strings with commas

Comma-separated strings often appear in form or label attributes, for example:

<input type="checkbox" name="hobby" value="reading,swimming,hiking">

When performing data processing, often The value string needs to be separated by commas to obtain the values ​​respectively. The following is an example of pseudo code:

var hobbyValues = $('input[name="hobby"]').val().split(',');
for (var i = 0; i < hobbyValues.length; i++) {
    // 进行处理
}

The above pseudo code realizes the separation of comma separated strings and separates the separated An operation to perform processing on each value. Next, we will explain in detail how to use jQuery to intercept strings with commas.

Use the split() function to intercept the string

The split() function can split the string according to the specified delimiter and return an array composed of the split strings. Therefore, we can use split() function to separate strings by commas.

Here is a sample code:

var str = 'reading,swimming,hiking';
var arr = str.split(',');
console.log(arr); // 输出 ['reading', 'swimming', 'hiking']

In the above code, we will use split() for the comma separated string reading,swimming,hiking The function performs segmentation and stores the segmented results in the array arr. Finally, we output the array, and we can see that the separated result is ['reading', 'swimming', 'hiking'].

Based on our needs above, we can modify the code so that it works for comma-separated values ​​in the form. The code is as follows:

var hobbyValues = $('input[name="hobby"]').val().split(',');
for (var i = 0; i < hobbyValues.length; i++) {
    // 进行处理
}

In the above code, we use $('input[name="hobby"]').val() to get the values ​​of all check boxes, and Separate them with commas. Then, use the split() function to split the string into an array hobbyValues, iterate over it and process it.

Avoid empty strings

In the above example code, we assume that all values ​​are legal, so the traversal operation is performed directly. However, in actual operation, some unexpected situations may occur, such as multiple consecutive commas appearing in a string, causing the value separated by the string to contain an empty string. At this time, we need to pay special attention to removing these empty strings to avoid exceptions.

In order to solve this problem, we can use the replace() function to replace consecutive commas with a single comma, and pass in the regular expression in the split() function The formula /[,s] / is used to filter empty strings. The modified code is as follows:

var str = 'reading,swimming,,hiking';
var arr = str.replace(/,+/g, ',').split(/[,s]+/);
console.log(arr); // 输出 ['reading', 'swimming', 'hiking']

In the above code, we added multiple consecutive commas in the str string and used /[,s] / Regular expressions are used as delimiters for string splitting. Here /[,s] / means any number of commas or spaces. It is important to note that the symbols in the regular expression mean to match at least one symbol, so that the empty string can be avoided.

Summary

This article briefly introduces the need to intercept strings with commas, and provides sample code for using the split() function to split strings. At the same time, it also describes how to avoid the occurrence of empty strings.

If you need to perform data processing on comma-separated strings in the form, you can refer to the above sample code and pay attention to the precautions mentioned in the code to avoid unexpected exceptions.

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