I'm trying to make a function in my Dapps front end that requests Ether from the user, I know I have to use web3.eth.sendTransaction() but am unsure of how to correctly implement and call this function on the front end of my Dapp, thanks!

current code is:

   $("#button").click(function() {
    Raffle.main(function (err, result) {
      web3.eth.sendTransaction({from:0x627306090abaB3A6e1400e9345bC60c78a8BEf57 ,to:0x086912faa7f6598d28d80c448c8d1e9dae5a4dee, value:web3.toWei(1, "ether")});
  • Please post your contract code.
    – lunr
    Jan 31, 2018 at 1:58
  • @lunr to invoke the "send" function do I not just call it on an event in the front end?
    – JAG
    Jan 31, 2018 at 2:01
  • Oh, I got it now. There are examples in the documentation: web3js.readthedocs.io/en/1.0/web3-eth.html#sendtransaction (this is for web3.js 1.0 version)
    – lunr
    Jan 31, 2018 at 2:09
  • @lunr yea, I'm already aware of that, I'm having trouble setting it up and calling in my contract
    – JAG
    Jan 31, 2018 at 2:12
  • Please post what you have now, so someone can help. Your question is very broad now.
    – lunr
    Jan 31, 2018 at 2:13

2 Answers 2


I found this to work to call a function and send Ether with it, to is my contracts address, value is the amount in wei I want to send with it and data is the address of my function that I want to call when sending the data

  function mainEnter() {
        web3.eth.getAccounts(function(error, result) {
            value:  "1000000000000000000", 
            data: "0xdf"
                }, function(err, transactionHash) {
          if (!err)
            console.log(transactionHash + " success"); 


Addresses should be strings:

    from: "0x627306090abaB3A6e1400e9345bC60c78a8BEf57",
    to: "0x086912faa7f6598d28d80c448c8d1e9dae5a4dee", 
    value: web3.toWei(1, "ether"), 
}, function(err, transactionHash) {
    if (err) { 
    } else {
  • Even when in string format the function still doesn't call
    – JAG
    Jan 31, 2018 at 2:31
  • How do you know it's not called?
    – lunr
    Jan 31, 2018 at 2:38
  • when I can the function that the sendTransaction function is in the value on metamask doesn't go to 1 ETH
    – JAG
    Jan 31, 2018 at 2:42
  • Please check the callback values.
    – lunr
    Jan 31, 2018 at 2:43
  • web3.utils.toWei(string, string) web3js.readthedocs.io/en/v1.3.4/…
    – Christian
    May 11, 2021 at 22:02

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