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  • jquery.form.js用法之清空form的方法

    本段代码摘取自jquery.form.js中,由于觉得该方法的使用性非常强,同时也可独立拿出来使用。
    该段代码言简意赅可以很好的作为学习参考。

    /**
     * Clears the form data. Takes the following actions on the form's input fields:
     * - input text fields will have their 'value' property set to the empty string
     * - select elements will have their 'selectedIndex' property set to -1
     * - checkbox and radio inputs will have their 'checked' property set to false
     * - inputs of type submit, button, reset, and hidden will *not* be effected
     * - button elements will *not* be effected
     */
    $.fn.clearForm = function(includeHidden) {
        return this.each(function() {
            $('input,select,textarea', this).clearFields(includeHidden);   //this表示设置上下文环境,有多个表单时只作用调用的表单
        });
    };
    $.fn.clearFields = $.fn.clearInputs = function(includeHidden) {
        var re = /^(?:color|date|datetime|email|month|number|password|range|search|tel|text|time|url|week)$/i; // 'hidden' is not in this list
        return this.each(function() {
            var t = this.type, tag = this.tagName.toLowerCase();
            if (re.test(t) || tag == 'textarea') {
                this.value = '';
            }
            else if (t == 'checkbox' || t == 'radio') {
                this.checked = false;
            }
            else if (tag == 'select') {
                this.selectedIndex = -1;
            }
            else if (t == "file") {
                if (/MSIE/.test(navigator.userAgent)) {
                     $(this).replaceWith($(this).clone(true));
                } else {
                     $(this).val('');
                }
           }
            else if (includeHidden) {
                // includeHidden can be the value true, or it can be a selector string
                // indicating a special test; for example:
                // $('#myForm').clearForm('.special:hidden')
                // the above would clean hidden inputs that have the class of 'special'
                if ( (includeHidden === true && /hidden/.test(t)) ||
                     (typeof includeHidden == 'string' && $(this).is(includeHidden)) ) {
                    this.value = '';
                }
            }
        });
    };
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  • 原文地址:https://www.cnblogs.com/zhujiabin/p/5089423.html
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