Input Text value 属性
定义和用法
value
属性设置或返回文本字段的 value 属性的值。
HTML value 属性包含默认值或用户输入的值(或脚本设置的值)。
另请参阅:
HTML 参考手册:Mwili wa <input> value kwa CodeW3C.com
实例
例子 1
更改文本字段的值:
document.getElementById("myText").value = "Bill Gates";
页面下方提供更多实例。
Mawazo ya kufaa
Inatoa value ya kina:
textObject.value
Inasababisha value ya kina:
textObject.value = text
Thamani ya kina
Thamani | Maelezo |
---|---|
text | Inahofisha thamani ya kufaa kwa sababu ya hisia ya kufaa. |
Vifaa vya teknolojia
Matokeo: | Mafaa mazuri, inaonyesha thamani ya kufaa kwa kufaa kwa sababu ya hisia ya uharibifu. |
---|
Mifano zaidi
Mifano 2
Pata thamani ya uagizaji wa matukio:
var x = document.getElementById("myText").value;
Mifano 3
Tathmini ya forma:
var at = document.getElementById("email").value.indexOf("@"); var age = document.getElementById("age").value; var fname = document.getElementById("fname").value; submitOK = "true"; if (fname.length > 10) { alert("Jina lazima hauwezi kuwa na zaidi ya 10 herufi"); submitOK = "false"; } if (isNaN(age) || age < 1 || age > 100) { alert("Umri lazima uwezi kuwa namba kati ya 1 na 100"); submitOK = "false"; } if (at == -1) { alert("Haiwezi kufikia barua pepe ya hali ya huzuni!"); submitOK = "false"; } if (submitOK == "false") { return false; }
Mifano 4
Kipindi cha kuchagua katika forma:
var mylist = document.getElementById("myList"); document.getElementById("favorite").value = mylist.options[mylist.selectedIndex].text;
Mifano 5
Kipindi chao cha kuchagua kingine:
var no = document.getElementById("no"); var option = no.options[no.selectedIndex].text; var txt = document.getElementById("result").value; txt = txt + option; document.getElementById("result").value = txt;
Mifano 6
Mfichana ya kuzingatia mafikira ya kati ya defaultValue na value ya tabia ya mifano:
var x = document.getElementById("myText"); var defaultVal = x.defaultValue; var currentVal = x.value;
Mwongozo wa kufikia
Chrome | Edge | Firefox | Safari | Opera |
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Chrome | Edge | Firefox | Safari | Opera |
Msaada | Msaada | Msaada | Msaada | Msaada |