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ResetA reset button on an HTML form. A reset button resets all elements in a form to their defaults.
创建源The HTML INPUT tag, with "reset" as the value of the TYPE attribute. For a given form, the JavaScript runtime engine creates an appropriate Reset object and puts it in the elements array of the corresponding Form object. You access a Reset object by indexing this array. You can index the array either by number or, if supplied, by using the value of the NAME attribute.事件句柄描述A Reset object on a form looks as follows:
A Reset object is a form element and must be defined within a FORM tag. The reset button's onClick event handler cannot prevent a form from being reset; once the button is clicked, the reset cannot be canceled. 属性概览
方法概览
示例示例 1. The following example displays a Text object with the default value "CA" and a reset button with the text "Clear Form" displayed on its face. If the user types a state abbreviation in the Text object and then clicks the Clear Form button, the original value of "CA" is restored.
<B>State: </B><INPUT TYPE="text" NAME="state" VALUE="CA" SIZE="2">
<HTML> 参看Button, Form, onReset, Form.reset, Submit属性formAn object reference specifying the form containing the reset button.
描述每个表单元素都有一个 form 属性用于指向元素的父表单。该属性在事件控制句柄中特别有用,你可能想要由其获得当前表单中其它元素。参看FormnameA string specifying the name of the reset button.
安全性Navigator 3.0:该属性默认是带有污点的。有关数据污点的更多信息,请看“JavaScript 的安全性”。描述The value of the name property initially reflects the value of the NAME attribute. Changing the name property overrides this setting.Do not confuse the name property with the label displayed on the reset button. The value property specifies the label for this button. The name property is not displayed on the screen; it is used to refer programmatically to the button. If multiple objects on the same form have the same NAME attribute, an array of the given name is created automatically. Each element in the array represents an individual Form object. Elements are indexed in source order starting at 0. For example, if two Text elements and a Reset element on the same form have their NAME attribute set to "myField", an array with the elements myField[0], myField[1], and myField[2] is created. You need to be aware of this situation in your code and know whether myField refers to a single element or to an array of elements. 示例In the following example, the valueGetter function uses a for loop to iterate over the array of elements on the valueTest form. The msgWindow window displays the names of all the elements on the form:
newWindow=window.open("http://home.netscape.com")
function valueGetter() { 参看Reset.valuetypeFor all Reset objects, the value of the type property is "reset". This property specifies the form element's type.
示例The following example writes the value of the type property for every element on a form.
for (var i = 0; i < document.form1.elements.length; i++) { valueA string that reflects the reset button's VALUE attribute.
安全性Navigator 3.0:该属性默认是带有污点的。有关数据污点的更多信息,请看“JavaScript 的安全性”。描述This string is displayed on the face of the button. When a VALUE attribute is not specified in HTML, the value property is the string "Reset".Do not confuse the value property with the name property. The name property is not displayed on the screen; it is used to refer programmatically to the button. 示例The following function evaluates the value property of a group of buttons and displays it in the msgWindow window:
function valueGetter() {
Query Submit
<INPUT TYPE="submit" NAME="submitButton"> 参看Reset.name方法blurRemoves focus from the reset button.
语法blur()参数无示例The following example removes focus from the reset button userReset:userReset.blur() This example assumes that the button is defined as <INPUT TYPE="reset" NAME="userReset"> 参看Reset.focusclickSimulates a mouse-click on the reset button, but does not trigger an object's onClick event handler.
语法click()参数无focusNavigates to the reset button and gives it focus.
语法focus()参数无参看Reset.blurhandleEvent调用指定事件的控制句柄。
语法handleEvent(event)参数
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