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[英]How do I check to make sure all my input:radio elements have a value?
[英]How to Check if i have text in my input
我想做一個小程序,將檢查我在輸入字段中是否有任何文本...如果它是一個數字,我就很容易做
cardsp.value >= 1
但是,當輸入為文本時,如何檢查字段中是否有內容?
Name : <input id="namep" type="text" />
我試圖做類似的事情(js),但這可能是某人做過的最錯誤的方式
var array= ["","a","b","c","d","e","f","g","h","i","j","k","m","n","l","o","p","q","r","s","t","u","v","w","x","y","z"];
function pay() {
namep.value
if(namep.value >= array.indexOf("a"), cardsp.value >= 1 , emailpa.value >= 1){
alert('Ty For Buying a Ticket From our compeny , you will receive the Invoicing in the ' +emailpa.value);
}
else if(namep.value == array.indexOf(""){
alert('Please Write Your Name');
}
}
您可以通過以下方式檢查輸入字段是否僅包含字母:
var letters = /^[a-z]+$/;
if( namep.value.match(letters) ) {
// string contains only letters.
}
var input=$("#namep").val();
要么
var input = document.getElementById('namep').value;
然后檢查是否有東西...
if(input.length>0)
{
//do something.
}
要么
var inputLength = input.length;
if(inputLength>0)
{
//do something.
}
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