❮ Input Text Object Example Change the default value of a text field: document.getElementById("myText").defaultValue="Goofy"; Try it Yourself » Description The defaultValue property sets or returns the def
CSS3中可以直接使用input:text的placeholder属性实现对应的功能。 相对于其他的浏览器,我的答案如下: DOM结构 <div><labelfor="inputText">用户名</label><inputstyle="height: 30px;width: 200px"type="text"name="inputText"data-default-value="请输入用户名"id="inputText"value='请输入用户名'/></div...
submit)按钮;<input,type="image",border=0,name="name",src="name.gif">,创建一个使用图象的提交(submit)按钮;<input,type="reset">,创建重置(reset)按钮;<BUTTON></BUTTON>,创建一个按钮;disabled="...",把按钮的状态设置为不能;name="...",按钮的控制名,value="...",按钮的值;type="...",...
function alertDefaultValue() { alert(document.getElementById('txt1').defaultValue); } </script> </head> <body> <textarea id="txt1"> Hello world...This is a text area </textarea> <br /> <input type="button" onclick="alertDefaultValue()" value="Alert default value" /> </body> ...
varx = document.getElementById("myText"); vardefaultVal = x.defaultValue; varcurrentVal = x.value; Try it Yourself » Related Pages HTML reference:HTML <input> value attribute ❮ Input Text Object Track your progress - it's free! Log inSign Up...
</p><p><input type="text"id="return_value"value=""placeholder="请输入内容"/></p><button id="close">关闭对话框</button></dialog><button id="show">显示对话框</button><!--script--><script>vardialog=document.querySelector("dialog");document.querySelector("#show").onclick=function(...
defaultValue Sets or returns the default value of a text field disabled Sets or returns whether the text field is disabled, or not form Returns a reference to the form that contains the text field list Returns a reference to the datalist that contains the text field maxLength Sets or returns...
<input name=”emaill" type= " email" value=fning@ /> 1. (3)placeholder属性 placeholder是指当 文本框处于末输入状态时文本框中显示的输入提示。在输入框为空时显式出现,而当输入框获得焦点时则会消失。 例如: < input type="text" placeholder = "default text" /> ...
" /> <input type="button" id="button1" onclick="alertValue()" value="Show default value" /> </form> </body> </html> 返回HTML DOM Text 对象参考手册
<textarea>：定义多行文本输入框。<label>：定义表单元素的标签。<iframe>：定义内联框架。<script>：...