[英]How can I multiply a value from a radio button by a number in Javascript and have the answer display in a textstring inside a textarea?
I need to have the user_input from the radio button multiplied by an integer. 我需要将单选按钮的user_input乘以一个整数。 The user_input is either 1,2, or 3. I can get the radio button value pulled through into the textarea, but how do I take that number and multiply it by something?
user_input可以是1,2或3。我可以将单选按钮的值拖入textarea,但是如何将其乘以某个值呢? Ideally, I need textstring += 'Fee (£): ' + (user_input) * '5' + '\\n';
理想情况下,我需要textstring + ='Fee(£):'+(user_input)*'5'+'\\ n';
Thanks for any help! 谢谢你的帮助!
// Get value of the 'Fee' radio buttons.
user_input = '';
for (i=0;i<document.forms['example'].fee.length;i++) {
if (document.forms['example'].fee[i].checked) {
user_input = document.forms['example'].fee[i].value;
}
}
textstring += 'Fee (£): ' + user_input + '\n';
// Write textstring to the textarea.
document.forms['example'].output.value = ("\n*** Thank You for your reservation***"+"\n")+ textstring + ("\n*** End of Form***"+"\n");
你有没有尝试过:
textstring += 'Fee (£): ' + (user_input*5) + '\n';
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