6 jQuery Cursor Functions

The following are some powerful jQuery code snippets for operating the mouse cursor! They can be used to set and get text cursor position and selection range in the input and text area fields. Enjoy it!

// jQuery 获取光标位置函数调用示例
$("input[name='username']").getCursorPosition();

jQuery.fn.getCursorPosition = function(){
    if(this.length == 0) return -1;
    return $(this).getSelectionStart();
};

// jQuery 设置光标位置函数调用示例
$("input[name='username']").setCursorPosition(5);

jQuery.fn.setCursorPosition = function(position){
    if(this.length == 0) return this;
    return $(this).setSelection(position, position);
};

// jQuery 获取文本选择函数调用示例
$("input[name='username']").getSelection();

jQuery.fn.getSelection = function(){
    if(this.length == 0) return -1;
    var s = $(this).getSelectionStart();
    var e = $(this).getSelectionEnd();
    return this[0].value.substring(s,e);
};

// jQuery 获取文本选择起始位置函数调用示例
$("input[name='username']").getSelectionStart();

jQuery.fn.getSelectionStart = function(){
    if(this.length == 0) return -1;
    var input = this[0];
    var pos = input.value.length;

    if (input.createTextRange) {
        var r = document.selection.createRange().duplicate();
        r.moveEnd('character', input.value.length);
        if (r.text == '') 
            pos = input.value.length;
        pos = input.value.lastIndexOf(r.text);
    } else if(typeof(input.selectionStart)!="undefined")
        pos = input.selectionStart;

    return pos;
};

// jQuery 获取文本选择结束位置函数调用示例
$("input[name='username']").getSelectionEnd();

jQuery.fn.getSelectionEnd = function(){
    if(this.length == 0) return -1;
    var input = this[0];
    var pos = input.value.length;

    if (input.createTextRange) {
        var r = document.selection.createRange().duplicate();
        r.moveStart('character', -input.value.length);
        if (r.text == '') 
            pos = input.value.length;
        pos = input.value.lastIndexOf(r.text);
    } else if(typeof(input.selectionEnd)!="undefined")
        pos = input.selectionEnd;

    return pos;
};

// jQuery 设置文本选择函数调用示例
$("input[name='username']").setSelection(4, 20);

jQuery.fn.setSelection = function(selectionStart, selectionEnd) {
    if(this.length == 0) return this;
    var input = this[0];

    if (input.createTextRange) {
        var range = input.createTextRange();
        range.collapse(true);
        range.moveEnd('character', selectionEnd);
        range.moveStart('character', selectionStart);
        range.select();
    } else if (input.setSelectionRange) {
        input.focus();
        input.setSelectionRange(selectionStart, selectionEnd);
    }

    return this;
};

jQuery cursor function FAQ

What is the purpose of the jQuery cursor function?

jQuery cursor function is used to manipulate the position of the cursor in the input field or text area. They are especially useful when you want to set or get the cursor position, select a specific text range, or move the cursor to the end of the input field. These functions can enhance the user experience by providing more interactive and intuitive input fields.

How to use selectionStart and selectionEnd properties in jQuery?

selectionStart and selectionEnd properties are part of the HTML DOM and can be used with jQuery to get or set the start and end positions of selected text in the input field or text area.

What is the setSelectionRange method and how to use it in jQuery?

setSelectionRange method is a DOM method that sets the start and end positions of the current text selection in the input field or text area.

How to move the cursor to the end of the input field in jQuery?

You can use the selectionStart and selectionEnd properties to move the cursor to the end of the input field.

How to use jQuery to select a specific text range in the input field?

You can use the setSelectionRange method to select a specific text range in the input field.

Can the jQuery cursor function be used with all types of input fields?

jQuery cursor function can be used with text fields and text area elements. They do not apply to other types of input fields, such as check boxes, radio buttons, or selection boxes.

How to use jQuery to get the current cursor position in the input field?

You can use the selectionStart property to get the current cursor position in the input field.

Can the jQuery cursor function be used in all browsers?

jQuery cursor function relies on DOM properties and methods that are widely supported in all modern browsers. However, older browsers may not support these features.

How to insert text in the current cursor position in the input field using jQuery?

You can insert text at the current cursor position using the selectionStart and selectionEnd properties as well as the value properties.

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